Chemistry Higher Tier Exam 1 - We Talk About Our Bin Routines

 Chemistry Higher Tier Exam 1 - We Talk About Our Bin Routines

This is episode number one of Lex Education, the comedy science podcast

Laura: Hello and welcome to another episode of Lex Education. It's the comedy science podcast where comedian me, Laura Lex tries to learn science from her nerdy coffee making brother, Ron. Hello to existing listeners. Well, you all exist. Uh, if this is your first episode that you're trying out though, here's my advice.

Laura: Halt this right here, pop back to.

Laura: Episode number one and listen all the way through. Coming in now won't make a lot of sense and it's best if you've been along for the ride. You go do that. We'll see you in a couple of weeks.

Laura: Hello, Ron.

Ron: This would be a truly bizarre place to start. Not only an exam, which obviously comes at the end, but also the second chemistry exam, which is the second of three subjects we do.

Laura: But at least it's the first half.

Laura: Of the second chemistry exam.

Ron: Yes, I guess, yeah.

Ron: There is one stranger choice and that would be next week's episode.

Laura: Next week's episode is actually Christmas.

Laura: This is our last lesson of term, Ron.

Laura: Yeah, we, which is good because we are both bogey filled cough monsters.

Ron: I'm out the other side of it as of yesterday, I think.

Laura: Oh, well, you're coming to stay this weekend and you can have this version of it.

Ron: Oh, fun.

Laura: Um, yeah, yeah. Our house is disgusting. I've got that weird bit of it where I wake up feeling horrendous and then I'm sort of fine in the middle of the day and then at about 9 o'clock it all just comes back again. It's m. Super annoying.

Ron: Just enough to keep you up most of.

Ron: The.

Ron: Most of the night.

Laura: Yeah, but however, Ron, I've had four days off gigging, so I got home Sunday afternoon, put up Christmas decorations and.

Laura: Obviously I've had bits of work to.

Laura: Do at home, but I've had time off from travelling and stuff. I have been in heaven. I've made so much bread. Yesterday I made brioche for the first time.

Ron: Ooh, how did that go?

Laura: It came out really well.

Laura: I really liked it.

Laura: Um, child of the podcast eats a lot of brioche. We find it to be an easy snack, but obviously, you know, you worry about processed foods and just buying a bag of dough from ASDA and adding it to your child.

Ron: Every third headline I see is about the effects of ultra processed food.

Laura: Yeah, exactly. So I'm trying to work out what's like. Because I won't live my life in fear. Like, sure, it's not the best, but look, she's probably going to live to 160 anyway because that generation you know, so if it's 140, it's not the end of the world, you know what I mean?

Ron: Well, um, I saw a headline the other day where it was like, um, even a very small amount of ultra processed foods has a long lasting effect. And you're like, it's everywhere. What am I supposed to do? So if small amount has an effect, then I'm not gonna sweat it because I'm not gonna be able to cut this shit out completely. Because even the things that you think are fine end up being fucked.

Ron: So.

Laura: Exactly.

Laura: And here's the other thing though.

Laura: Yeah. Ultra processed foods probably have terrible effect.

Laura: On our brains and we're all anxious and sad, blah, blah, blah.

Laura: But they've also made it so that.

Laura: I can have a job and a life because if I didn't eat ultra.

Laura: Processed foods, I would have to be.

Laura: A full time at home housewife and mother person, house person just to be able to make all the things that we need to eat. Because I can't make enough bread and brioche and baked beans and everything and nuggets and go to work to pay for the ingredients to make those. So it's a trade off, isn't it?

Ron: Yeah.

Laura: What, uh, we gonna do? We can campaign. We can campaign, Ron, for higher wages so that you can live off one income in a household and the other one can sit around soaking lentils all day.

Ron: Well, I think you just, um, make the choices that you can. I stopped eating supermarket bread because I heard that was an easy way to cut it out.

Laura: Yeah.

Laura: Yeah.

Laura: Well, child of the podcast really wants to come up and talk to you. We've said no.

Ron: M. I'll see you on Saturday.

Laura: Yeah, anyway, uh, first chemistry exam. Sorry, we're a little bit given up, aren't we, Ron? We're just in full Christmas swing.

Ron: It's also 12 minutes past 8 in the morning.

Laura: It is one of our earliest ever.

Laura: Records, if not the earliest ever record.

Ron: Probably the earliest remote record we've ever done.

Laura: Yeah, prob prob, probs.

Laura: But um, I'm very excited about it. And it turns out we needn't have done such an early record. We could have done the 10:30 time because the Christmas market we were going to go and wander around. It is the most disgusting weather here today.

Ron: Why didn't

00:05:00

Ron: you say what though?

Ron: Uh, we could have done later because.

Laura: Now it's just easy to get out of the way, isn't it?

Ron: For you?

Ron: I had to get up early.

Laura: Oh, boo. And who.

Ron: This is my time Where I get ready for work.

This episode is first half of the chemistry exam

Laura: You are getting ready for work, Grinch style.

Ron: Talking to a fucking Pilchard on the.

Ron: Internet about the Grinch.

Laura: What else could get you in the mood? Anyway, this episode is not Grinch. This episode is first half of the chemistry exam. Go forth, my listener buddies.

Laura: Enjoy.

You sound very quiet on this recording, Ron. Must be because it's just coming through the microphone

Laura: It's time.

Laura: Okay. I promised myself I was going to do some extra research for this. Have I? Have I, buggery?

Ron: Of course not.

Laura: I really did think I was going to. Also, Ron, you have to be kind to me in today's recording because I have a pint less blood than I should have.

Ron: Okay. Have you had biscuits?

Laura: Yeah, lovely.

Ron: You sound very quiet.

Laura: Do I?

Ron: Yeah.

Laura: How's that? Is that better?

Ron: It's a bit better. I've got my laptop on full volume and you still seem quiet to me.

Laura: Uh, is your headphones got a little scrolly volume on it? Because I'm hitting the yellow every now and again on the record.

Ron: Must be because it's just coming through the. The microphone or something.

Laura: Hmm. I think I'm hitting green. Yeah, that's gone into yellow doing that.

Ron: So maybe I'm just deaf.

Mackney takes iron supplements even though he takes no blood

All right, let's crack on. Right, Let me start the time.

Laura: Guess what, though, Ron. Guess what they were on.

Ron: What's that?

Laura: They had to take, uh, a little bit of my blood to cheque my haemoglobin levels. And I was like, oh, so you're checking the oxygen levels in my blood, are you?

Ron: And did they say, no, we're checking the haemoglobin levels?

Laura: Yeah, they did.

Laura: Yeah.

Laura: But I was like, the oxygen's in the haemoglobin.

Ron: Mmm. M. Iron levels. You could have said, why? Because iron's in haemoglobin.

Laura: Oh. I told them I take iron supplements, so I should have loads of iron. But here's the thing, Ron. You have to have 125 hemoglobins to donate blood. I snuck under the door with 127. Only just enough.

Ron: Good, good. Passing great blood.

Laura: But even better, Laura, even though I take iron supplements.

Ron: Yeah, you are weak.

Laura: I'd be through the floor without those bad boys. Turns out without my iron supplements, there's no iron in my blood.

Ron: No.

Laura: When they put my little drop of blood in the blue tube, it turned into a donut and then hovered about a bit, and she was like, your blood's being weird. And then they had to do it again on a special machine. Oh, it didn't go into a droplet. It went into, like, a full circle.

Ron: You'd Think if they have to whip out the machine, they'd just go, nah, maybe not your blood.

Laura: No. Cause I'm great. And they were like, oh, my God. The rest of everything is great. Look at you surviving with nothing that you need in your body.

Ron: I made cheese today.

Laura: You did. You made mozzarella. And it tastes like vinegar.

Ron: Yeah, it's a bit vinegary.

Laura: Um, did you have to buy buffalo milk?

Ron: No, I just used whole milk from Tesco.

Laura: And then you just. How do you make mozzarella, Ron?

Ron: Well, what you do is you mix them. You can use vinegar or rennet. I use vinegar because it was easy to find the Instagram reel that I saw that made this look a lot easier than it actually is. Used vinegar. And also, if you use rennet, then it's not vegetarian.

Laura: No. That's part of a stomach, isn't it?

Ron: Rennet, part of a cow stomach. Yeah. Um, which is why Parmesan is not vegetarian. Um, so I use vinegar. And basically you heat it up to 46 degrees, the milk in a pan, you add the vinegar, you whack the lid on, and then you leave that for 10 minutes. All of the white clumps together into kind of a frothy mush. Then you scoop all of that out and form that into balls, squeezing out as much of the water as you can. Then you heat the liquid way back up to about 65 degrees. And then what you do is you put the balls. Put a ball in there, leave it in there for about 30 seconds, take it out, stretch it as much as possible and kind of massage it to get that. It's almost like kneading dough, sort of to get that stringiness that you know from mozzarella. Back in, 30 seconds, back out. Stretching mozzarella back in. Do that like three or four times. Salt it at some point so it tastes nice. Then you got mozzarella. That's it. Leave it in cold water for half an hour so that it properly firms up, and you got mozzarella, baby.

Laura: Beautiful.

Ron: Um,

00:10:00

Ron: and you get quite a lot, like, I'd say. So I spent, like, what, like a pound fifty on four pints of milk, and I'd say I made maybe like, eight pounds worth of mozzarella.

Laura: M. You should start a market stall, Ron.

Ron: I'd wait till it was good first. Um, I don't think I'll start now, but, um. Yeah, for when I've got an hour to kill and I want mozzarella.

Laura: Yeah, why not? I'm excited for you.

Ron: So he's excited for Me.

Laura: Macky's thrilled. Mackie loves mozzarella. Bet she would too, that snuffy little pig.

Ron: She probably would. And um, I know that there's very little to it. Now, I always thought mozzarella be a hard to make cheese, but no.

Laura: Next, make cheddar and then compare it.

Ron: Yeah, okay. I don't do I want to be a cheese guy?

Laura: Maybe you've been a sourdough guy. Your current porridge guy. Why not have a go at cheeseburger?

Ron: I'm a chutney guy at the moment.

Laura: You're a chutter?

Is it normal to vacuum your food caddy every time you vacuum

Ron: I'm a chutter chutist. Do you know what I am at the moment? Living on my own. I'm um, someone that's turning into a bit of a moniker.

Laura: Mm. Mhm. I did say this to you when we stayed at your house, I did say to you, don't live alone for too long, Ron. You're gonna turn weird.

Ron: Well, I don't think it's weird, but.

Laura: Like, that's because you're living alone.

Ron: Is it. Is it too far if you wash up the little food caddy every time you take the bag out?

Laura: Er, uh, no, that seems sensible.

Ron: That's normal.

Laura: Okay, I don't have a food caddy.

Ron: But is it normal to pick all of the fluff out of the vacuum philtre every time you vacuum the house?

Laura: I do.

Ron: Okay, cool. Then we're normal.

Laura: Yeah, let's not ask anybody that's not us.

Ron: It's just I've got a nice little system now. I take the food bag out and I put that outside. And then I spray the inside with, um, lovely smelly. Nice spray. And then I wipe that with two squares of kitchen roll. And then that kitchen roll becomes the absorbent bit underneath the food bag and it's already perfumed by the lovely spray. And it's a nice system.

Laura: I think it's perfectly normal for you to do that. And you should continue. I, uh, do think it's some of the dullest podcast content we've ever put out.

We've only got 1 hour and 39 minutes left in chemistry exam

Ron: Well, we've only got 1 hour and 39 minutes left, so we better not.

Laura: This wasn't included in the exam time.

Ron: I'm sorry.

Laura: I can't be penalised because the idiot exam guy was telling me about his weird house fetishes.

Ron: I'm sorry, I did say that I'd started the timer.

Laura: You didn't.

Ron: I did. When I said timer's on and then we started chatting. Yeah, Soz. Right.

Laura: Should we crack on, then restart it?

Ron: No. Question. One discoveries in chemistry, I should say. We're doing AQA. Higher tier chemistry. Uh, June 23rd.

Laura: Anyone that wants to give them this information a third of the way through the second episode of the exam.

Ron: Yes. But as we crawl closer to being professional podcasters, we start doing these things. Right.

Laura: Okay.

Ron: And we talk about our bin routines.

Describe the plum pudding model of the atom for two marks

Um, question one. Discoveries in chemistry led to a better.

Laura: Um, Rubbish. Genes.

Ron: Discoveries in chemistry led to a better understanding of atomic structure. Atoms were originally thought to be tiny spheres that could not be divided.

Laura: Clampudding.

Ron: The plum pudding model of the atom was then developed.

Laura: Ah, I just bit my pen and it broke. Uh, plastic in my mouth now, to.

Ron: Someone that didn't know what we were doing, shouted the words plum pudding. Bit a pen in half. Figure 1 represents the plum pudding model of the atom. Describe, uh, figure one to us, Laura. Actually, no, actually, don't do that. Just describe it. Because the question is, describe the plum pudding model of the atom for two marks.

Laura: Okay, well, what do they want me to say, though? It's a circle.

Ron: Uh.

Laura: It'S a. No, don't, don't, don't. Ron. I didn't say this was my answer. Uh, because describing it to the listener and describing it for marks.

Ron: The listeners aren't dumb. Dumbs. They know what the plum pudding model is and so do you. So don't feel like you have to explain it too much.

Describe the plum pudding model of the atom

Laura: So, uh, the plum

00:15:00

Laura: pudding model. Describe the plum pudding model of the atom. Oh, Fuck. It's question one.

Laura: The panic.

Laura: The veil of panic.

Laura: Oh.

Ron: One hour 36.

Laura: Oh, um, um, the negative electrons are sitting in the positive atom. Uh, in this model, the negative electrons would be represented by plums. In a positive pudding, the atom was thought to be a solid structure with no gaps.

Ron: All right, want me to read that back?

Laura: Nope, haven't got time.

Ron: Atoms contain electrons, neutrons and protons. Write these three particles in order of their discovery.

Laura: Now I feel like we did this. Okay, yeah, hang on.

Ron: Um, I'm worried.

Laura: No, because I don't remember that last one.

Ron: No, I think this is a different thing.

Laura: I was worried that we're doing a, um.

Ron: Yeah, no, this is different. Okay.

Laura: I thought it was contained. Now I got it really wrong last time.

Ron: How did I think we have done this question? Because. Let's talk about tennessine on the next.

Laura: Maybe it just partly came up in the one we did with Meg.

Ron: Hang on. Um, I'm going to pause the clock. You might have to start again. Shit.

Laura: Would I have got two marks from.

Ron: Um, for the purposes of the podcast, I'd have given you two. You were a bit vague. You definitely got one. You're a bit vague on sort of the positiveness part of it. Right, there's a new one. Sorry.

Laura: Mhm. Squealy. Beep, beep, beep.

Question one is about structure and bonding. Which two substances have intermolecular forces

Ron: All right, the, the timer. The timer has restarted with a new paper.

Laura: Okay.

Ron: Question one. We're now doing June 2020, everyone.

Laura: Famously. Dreadful year.

Ron: Yeah, they probably lowballed all the questions then so that this Soppy Bollocks kids could get through their exam.

Laura: Good, because I am, um, in the Soppy Bollocks gang. We're the Soppy Bollocks kids in the Soppy Bollocks gang. And our, uh, bollocks are, uh, soppy, Soppy. Soppy, Soppy. Soppy.

Ron: Soppy's a funny word, M. All my.

Laura: Rage was in that pint of blood I gave away.

Ron: You're just happy now.

Laura: I feel very Zen.

Ron: That's nice.

Laura: It might be that I've eaten three biscuits at well and a bag of crisps.

Ron: Oh, wow.

Laura: I thought I'd better eat loads.

Ron: Just be safe.

Laura: Fill the remaining blood I have with sugar to the point that my pancreas gives up.

Ron: Laura, this question is about structure and bonding.

Laura: Okay, which two substances have, uh, pushed my headphone in too far?

Ron: Ah.

Laura: Uh, I feel like I'm in space. I don't like it. That was horrible. I didn't like that at all. My head felt too swollen.

Ron: Have you watched Interstellar yet?

Laura: No, I think I'm going to try and watch it tonight.

Ron: Fun. Diamond. Which, which do you have intermolecular forces between the particles, Laura? Diamond. Magnesium. Polyethylene. Sodium chloride. Water.

Laura: Okay, I'm not going to panic. I'm going to have a think to myself. Intermolecular. That must mean there's a molecule involved. That means to me. Diamond. No, because there's no molecules in diamond. It's just pure atoms. Uh, I would assume then. And get rid of magnesium, because that's a single element.

00:20:00

Laura: Then we're on to polyethylene, potentially. Sodium chloride and water. I don't know anything about polyethylene, but if I'm working on my hypothesis, sodium chloride, which is NaCl and H2O. They've got molecules holding the different things together. So I'm going to say sodium chloride and water.

Ron: On final answer.

Laura: Yeah.

Ron: Both got molecules.

Laura: No. Why have you said that?

Ron: No reason.

Laura: Ron, if I promise that that answer's locked in, can you tell me about it now?

Ron: Yes, but that answer's locked in.

Laura: Yeah.

Ron: Sodium chloride doesn't have molecules in it.

Laura: Why?

Ron: Because it's got sodium to metal. It's an ionic bond between those two things, isn't it, Sake? Water was right, though.

Laura: Is an ionic bond, not a molecular force.

Ron: No bond between ions. Not intermolecular.

Laura: Oh, uh, you can't have an iron molecule, then.

Ron: No. Okay, well, you can have molecules, can be ions, but that's different. Don't worry about it.

Table one shows the structure of three compounds, Laura. The diagrams are not to scale

Table one shows the structure of three compounds, Laura. And for Sake. The diagrams are not to scale.

Laura: Carbon dioxide is massive. I keep choking on it. We've got carbon dioxide playing golf with a magnesium oxide.

Ron: Carbon dioxide looks like a bold cheerleader from above.

Laura: Yeah.

Ron: And we've got magnesium oxide, which looks like a dice from a crazy place. And then we've got silicon dioxide, which.

Laura: Looks like a duck stuck to loads of other ducks.

Ron: Yeah, duck pyramid. Duck cheerleaders competing with the other bolding cheerleader. Compare the structure and bonding of the three compounds.

Laura: I wonder how discussions they had about whether the diagrams not to scale thing needed to go there for legal reasons.

Ron: I want. I. I wonder if they put it past a bunch of kids and they kept on saying, carbon is longer than this, is shorter than that. Yeah, because they are next to each other. But anyway, um, yeah, compare the structures and bonding of those three compounds, Laura.

Laura: Um, magnesium oxide has the tightest bonds of the three compounds.

Ron: Do you want to. You want to use the word tightest? You said magnesium oxide has the tightest bonds.

Laura: The strongest bonds. Has the strongest bonds.

Ron: Why do you think that?

Laura: They're close together. They're really close together. Stop to scale, you fawn. Any sticks on that one? Okay, don't scrap that then. Scrap that then. Scrap it out. I said scrap it out.

Ron: Uh, don't use the pictures. Use your knowledge of bonds instruction.

Laura: Then. I've got nothing to use. Magnesium oxide has.

Ron: Sorry, I'm watching this video that.

Laura: No, stop watching videos while we're doing a podcast.

Ron: Your child.

Laura: Why? What's she doing?

Ron: She's being very cute.

Laura: I wanna watch it now.

Ron: She looks grown up.

Laura: I will watch it later. Okay. I really want to pass this exam. So magnesium oxide, uh, has ionic bonds where the other two compounds have covalent bonds.

Ron: Okay.

Laura: This makes the bonding in the magnesium oxide the strongest of the three. Carbon dioxide and silicon dioxide both have covalent.

00:25:00

Laura: Carbon dioxide is a more stable structure than silicon dioxide because there are no spare bonds in the structure. Although I don't understand that, though. Why has oxygen got two bonds when it's in silicon dioxide and one in Carbon dioxide doesn't make any sense.

Ron: Do, uh, you want me to read that back?

Laura: No. I don't know. Science talk. Silicon dioxide has, um. Like, I want to say more higgledy piggledy, but I don't know how to make that sciency. Less formulaic structure, more erratic structure. I'm going to say a more erratic structure of bonds. Um, no, I don't know. That's all I've got.

Ron: Question two.

Laura: Some of that was right, wasn't it?

Ron: The first sentence was right.

Laura: Do they not have, um, covalent bonds?

Ron: That was the first sentence.

Laura: And that has magnetic bonds, ionic bonds.

Ron: Yeah, that was all in the first sentence.

Laura: Yeah. There's no spare bonds on carbon dioxide sticking out.

Ron: No spare bonds.

Laura: And silicon dioxide, why has it got little nubs sticking out then? Why is oxygen got more bonds in silicon than in carbon?

Ron: It doesn't.

Laura: It does. Look, each of those oxygens has got two sticks coming off it.

Ron: Yeah. And it's a double bond in carbon dioxide.

Laura: For Fuck's sake.

Which two statements are properties of most transition metals? They are soft metals

Ron: Question 2. This question is about metals and the reactivity series. Which two statements are properties of most transition metals? They are soft metals. They form colourless compounds, they form ions with different charges, they have high melting points, they have low densities.

Laura: What the is a transition metal? Oh, I'm angry.

Ron: You can look at your periodic table.

Laura: My one or a different one? Oh, transition metals are these pink dudes. Oh, that's most metals. Um, right, so if the ones I know, let's say they are soft metals. Um, um.

Ron: Where you getting that from?

Laura: Uh, because I think we discussed silver and platinum being soft and that's why they're good for jewellery. And they are in transition metals next.

Ron: To pillow soft iron and titanium. You're getting so many helps. This is so hard. It's so hard to let you do this unchecked.

Laura: Why don't we do the exam together? Let's just do it as a group exercise.

Ron: Should we do that as a patreon? Shall I do an exam?

Laura: Let me see why I get you sitting there going, whoos. This isn't it Fucking.

Ron: It'd be interesting, though, to see what I get.

Laura: Oh, uh, 98%. All right, they're not soft metals, then. No, that's crazy.

Ron: You hear the word metal and he.

Laura: Thinks, I literally got this wrong on something else. Where you were like, no, platinum's a soft metal. That's why all your jewellery is made of it. Well, not mine, I can't afford it. But, like, now it's different. Do you see why it's frustrating, yeah.

Ron: But it's not my fault. But also, you have to see that lots and lots of other metals are there. Ones that you know to be hard.

Laura: Okay, so they're not soft metals. I don't know about colourless compounds.

00:30:00

Laura: Maybes, uh, ions with different charges. Sounds like it could be true. High melting points. No, let's not do that one. Maybe they do, maybe they don't. We'll never know. Low densities. Well, it feels like if you had a low density, you'd be soft. And I know they're not soft, so I gotta pick two of these three other ones. Uh, Ron loves ions, so we're gonna go ions with different charges and, um, colourless compounds. Most efficacious in every case. We'll drink a drink. A drink to Lily. The pink. The pink. The pink.

Ron: All right, wait.

Laura: A student added copper metal to colourless silver nitrate solution, and the solution turned blue. So colourless compound feels, um, unlikely. I'd like to change that, please. To ions with different charges.

Ron: Ron, you already said that one.

Laura: High melting point.

Ron: Fucking hell. A student added, uh, copper metal to colourless silver nitrate solution. The student observed pale grey crystals forming the solution turning blue. Explain how these observations that show that silver is less. Less reactive than copper.

Laura: The copper attracted the nitrate to itself. Copper reacted with the nitrate. Copper. The copper reacted with the nitrogen. I guess nitrate, we'll say nitrate, um, stealing it from the silver. And, um, the silver was not reactive enough to hold on to the nitrate.

Ron: Um.

Laura: Why'd it go blue, though? Uh, we know this because the observations the students saw, um, the pale grey crystals show the silver going back to being single silver. And the solution turning blue. Is this signature colour of carbon nitrate.

Ron: Uh, you know, um. Do you want me to read that back?

Laura: No, I never want you to read it back, Ron. Otherwise I have to listen to it now and I have to listen to it in the results.

Students are given three metals to identify by comparing reactions with dilute acid

Ron: Okay. Question 2.3. A student is given three metals, X, Y and Z to identify the metals. Magnesium, iron and copper. Plan an investigation to identify the three metals by comparing their reactions with dilute hydrochloric acid. Your plan should give valid results.

Laura: I have no idea. Get three beakers, put some hydrochloric acid in them. 100 mil in each one. Um, put goggles on. Get some tweezers. Um, pick up a piece of metal, X, pop it in the beaker first. Beaker. See if it fizzes. See if there's a fire. See if it changes colour. Um, if it does, that's magnesium uh, hot number

00:35:00

Laura: in the next speaker. Have a look. Two years. See if you can't tell the difference between magnesium ion and copper. I don't think you should be a scientist. Copper. If it goes blue, that's copper. And then iron is the other one. You don't need to put that in hydrochloric acid because once you've identified the two, you'll know what the third one is. Save yourself a beaker. I don't think the answers wrong. I don't know anything for some reason.

Ron: I've taken all of that time typing that out for some reason.

Laura: Oh, you'll have a really good time reading it back to me really slowly in two weeks time.

Ron: Yeah, that will be a good laugh to be fair. You done with that?

Laura: Yeah. Stir it.

Laura: Stir it.

Laura: Take goggles off.

Ron: Stir it. Take goggles off.

Laura: How's that for valid results?

Ron: Metal M. M has two isotopes. Table 2 shows the mass, number and percentage abundances of the isotopes. 30% mass number 203. 70% mass number 205. Calculate the relative atomic mass of metal M. Give your answer to one decimal place.

Laura: Oh, I can't remember how to do this at all. Um, oh, Ron, did I tell you, by the way, what happened at, uh, my gig on Friday in Southend?

Ron: No.

Laura: What are you reading?

Ron: Technically should still be working. So I was just double checking that email wasn't important.

Laura: I was at my gig on Friday doing my tour show and I said like, does anybody listen to the podcast? And this guy, uh, in the front row went, oh, yeah, I listen to loads. Chatterbix is really good. And I was like, it was very embarrassing. Um, um. Right, table two shows the mass, number and percentage abundance of the isotopes. Do you know what? I think I've stumbled across the correct answer here. And then I'm going to give the answer. 204.4.

Ron: Final answer.

Laura: Yes, Ron, I think I've got that right.

Student investigated the law of conservation of mass using two beakers

Ron: Question number three.

Laura: Oh, blank page.

Ron: This question is about silver iodine.

Laura: Oh, brilliant. I was hoping a question on silver iodide would come up.

Ron: We were just talking about silver iodide the other day. Um, silver iodide is produced in the reaction between silver nitrate solution and sodium iodide solution. The equation for the reaction is those two things reacting together. A student investigated the law of conservation of mass. This is the method used. Pour silver nitrate solution into a beaker labelled A. Pour sodium iodide solution into a beaker labelled B. Measure the masses of both beakers and their contents. Pour the solution from beaker B into beaker A. Measure the masses of both beakers and their contents. Again, table 3 shows the results. We've got mass before mixing in grammes, um, beaker and its contents, 78.26 and beaker B, 78.5. Mass after mixing in grammes, 108.2 for, uh, two for uh, beaker A and 48.54 for beaker B. Explain how the result. I like how the results demonstrate the law of conservation of mass. You should use data from table three in your answer.

Laura: Should. Yeah, yeah. What the hell is the law of conservation of mass? That's never come up before. We haven't discussed that.

Ron: Have. Huh.

Laura: We.

Ron: Just trying to

00:40:00

Ron: sort of focus through the panic fog. What do you think it is?

Laura: Well, my guess would be it's how do you hold onto the mass? But one of them hasn't.

Ron: Right. Okay. Oh, uh.

Laura: I hate this so much. Silver iodide is produced in the reaction between silver nitrate solution and sodium iodide. I don't even understand what's happening here. So you've, you've mixed them together and then it changes weight just because you pour it into a different beaker. Pour silver nitrate solution into a beaker labelled A. Pour sodium iodide solution into a beaker labelled B. Measure the masses of both beakers and their contents. Pour the solution from beaker B into beaker A. Measure the masses of both beakers and their contents again.

Ron: Mm, mhm. So what's, what's holding you up here?

Laura: I don't know what's going on.

Ron: They've put some stuff in one beaker, some stuff in the other beaker and then they've mixed them together.

Laura: Yeah, yeah. So. So the beaker weighs 48.54 is basically what you're telling me.

Ron: Yep.

Laura: Yeah. Now, but if I do 108 minus 48, I don't. Wait. But that's two things worth. What do I have to do? So. Oh, that fart smells. It smells like Mackie's breath.

Ron: Oh God.

Laura: Um. Oh, death is coming. Oh, I just don't want to do this exam. Can we just not.

Ron: Laura, just prove that no mass has been lost. I can't add the numbers together.

Laura: So you have all of the stuff.

Ron: Before it got mixed together and then the stuff afterwards. Add the numbers together, included the weight of the beaker. Uh, because when you pour something from one beaker to the other one, residue is going to get left in it. So you just weigh the whole thing, add the numbers together.

Laura: So 78.26 plus 78.5 equals 156.76. And then also 108.22 plus 48.54 also equals 156.76.

Ron: What a coincidence.

Laura: So, uh, no mass has been lost?

Ron: Yeah.

Laura: Is that enough?

Ron: Yeah.

Laura: Okay. Three marks.

Do you know what we should do that would be accurate

Ron: It's only two marks.

Laura: Why?

Ron: Because the question was for two marks. Because that was a. That's a baby question.

Laura: It's not a baby question, Laur.

Ron: It was. What? These numbers are the same. You got really hung up on two things getting mixed together in a beaker.

Laura: Do you know what we should do that would be an accurate. You should have to come and do a five minute comedy spot. You should have to write five minutes of stand up comedy and come and perform it.

Ron: No, that's not the same.

Laura: Because this is the same.

Ron: No, because this isn't my job.

Laura: It would be if you'd stuck to what you studied at university, son.

Ron: Dynamite impression of mum.

Laura: Thank you. Um, no, but I'm saying for, like, panicked reaction to something I don't find panicking and, uh, my fingers still hurt.

Ron: I think probably a better one would be for me to. I don't know.

Laura: Sex with Tom?

Ron: No, I was gonna say, like, star in a GCSE performance of Much Ado About Nothing.

Laura: Yeah.

Ron: This is for kids.

Laura: Musical.

Ron: Yeah.

Laura: Maybe you should have to be Javert in Les Mis.

Ron: Maybe.

Laura: Okay. Sing stars in the multitude.

Ron: No,

00:45:00

Ron: that's a different podcast.

Laura, suggest how the student could separate the insoluble silver iodide

Laura, we simply don't have time. We're against the clock here. You've got a minute. You've got an hour and a quarter left.

Laura: Oh, no. What if time runs out and I don't get to answer all the questions correctly?

Ron: Laura, suggest how the student could separate the insoluble silver iodide from the mixture at the end of the reaction.

Laura: Um, strain it through a cheesecloth.

Ron: Put it in science words.

Laura: Strain it through a science cloth. What's a philtre it? Philtre it through a juice. Would it be offensive? What would you use in science? A philtre. Okay. Philtre it for a philtre. Philtre paper.

Ron: Literally. Just the word philtre will get you that mark.

Laura: 100 points.

Ron: 3.3. The student purified the separated silver iodide. This is the method used. Rinse the silver iodide with distilled water. Warm the silver iodide. Suggest one impurity that was removed by rinsing with water.

Laura: Um, nitrogen nitrate.

Ron: Final. Um. Answer.

Laura: Nitrate solution.

Ron: Final answer.

Laura: Yeah.

Ron: Suggest why the student warmed the silver iodide.

Laura: Comforting.

Ron: Final answer.

Laura: Kill. No, I don't know. I don't know. Ron, uh, why would you need to warm up some silver iodide? Uh, where is iodide? I don't care. Uh.

Ron: Giving up on that one?

Laura: No, I don't, uh. I don't even know what ballpark. I don't even. I don't know. I don't know what we're aiming for here. Stirrup. Purified the separated silver iodide. Rinsed it, warmed it, dried it, maybe that. Dried it. Dried it. Ron, I'm gonna say to dry it.

Ron: There we go.

Laura: Like a hair dryer, but otherwise you get fluff on it if you used a towel.

Calculate the percentage atom economy for the production of silver iodide

Ron: Calculate the percentage atom economy for the production of silver iodide in this reaction. The equation for the reaction is silver nitrate plus sodium iodide equals silver iodide plus sodium nitrate. Give your answer to three significant figures. Go.

Laura: Oh, fuck. Oh, I've got, uh, water tummy. Atom economy. What are you talking about? What's atom economy?

Ron: This is another one where. What does it sound like it is?

Laura: Uh, is it just. Maybe I'll just replace all those with the numbers and see what happens. 170 plus 150 turns into 235 plus 85. So that's 420 and 320.

Ron: Uh, no.

Laura: Almost. 320 and 320.

Ron: It almost like there's a rule about conservation of mass, isn't there? So why don't you read the question again.

Laura: Calculate the percentage atom economy for the production of silver iodide in this reaction. I think the silver is the AG bit. So does that, uh, help? Hm?

Ron: Which one's the silver iodide?

Laura: AGL?

00:50:00

Ron: Well, considering that's an I. Maybe.

Laura: AGI. AGI is the, uh, silver iodide. So that's 235.

Ron: Yep.

Laura: That's good, isn't it? Then moving.

Ron: M on. Um.

Laura: No.

Laura: Help me.

Ron: You want this to be your help?

Laura: Oh, yeah, yeah.

Ron: Okay. You're looking for a percentage.

Laura: There isn't one.

Ron: What do you mean there isn't one?

Laura: None of those are percentages.

Ron: No, because you need to calculate a percentage.

Laura: How? Uh, but what percentage?

Ron: You worked out how much. You started with 320 and you've identified what the max.

Laura: 235.

Ron: Yeah. How could we turn those numbers into a percentage?

Laura: Which way round you do it? If it was 180, you'd divide 100 by 80 makes 80. Is that right? Nope. Oh, uh. Fucking God. Shite bag. Okay, so I'm going to do 235 divided by 320 times 100 to 3 significant figures. I know what this means now, Ron. I'm going to say 73.4%. Yeah.

Ron: Okay. Rage over. Uh, give one reason why reactions with a high atom economy are used in industry. Um.

Laura: It is more cost effective.

Ron: Final answer.

Laura: Yep.

Ron: One of the correct. No, I'll say that when we go through the marking.

Ron's planning to do a train edit so look out for silences

All right, Laura, question four. Laura?

Laura: Mhm?

Ron: Question four. Yes.

Laura: There we go.

Laura: We don't actually know what was in that episode because Ron's not edited it yet. He's planning to do a train edit, which means there'll be no alternative titles and, uh, barely any editing. So look out for some silences in this episode.

Ron: They'll be editing.

Laura: I think the first half of this. I remember it being okay. I had my skipping system down.

Ron: I mean, no spoilers. We're literally only halfway through, so.

Laura: Yeah, yeah, yeah, yeah.

We need to do finally a register that has been weeks in the making

Laura: Um, anyway, Ron, we need to do. We need to do finally a register that has been weeks in the making.

Ron: Yes.

Ron: Because we did record this and then, um.

Laura: And then the Internet goofed us.

Ron: Yeah.

Ron: And then I was. When I got out of bed at the other end of the day to record this podcast, I, I did not feel like doing a register.

Laura: Did you ever find out if Luke Evans is the Luke Evans from your work?

Ron: Nope.

Laura: They just never came forward to tell you.

Ron: Well, I presume it's not because I asked if it was the Luke Evans from work.

Laura: I love that somebody has signed up to the Patreon, like loves us enough to give us some pounds, but has not replied to our information request as to who the hell they are. I love the Lurkers. The Lurkers are my favourite people. No, I love the chatters too. Now I feel bad. I love everybody, but I think I feel a special affinity with the lurkers because I think I'm a lurker in my own podcast. Like sometimes I look at the discord and I'm like, no, I won't get involved. Everybody's chatting.

Ron: Yeah, I just, I don't, I don't want to bother people, you know.

Laura: Exactly. We bother people in one hourly manageable, bite sized lump called a podcast. And then we stay the hell away. Um, so we would like to say a big old Lex education thank you to Luke Evans. Luke is the new sound tech for me and Ron. This isn't a comedy register entry. They are just approaching professional podcast time and they need some help.

Laura: Wait, I've switched.

Laura: I don't understand this One. Luke Evans is the new sound tech for Ron and Laura. This isn't a comedy register entry. Oh, yeah, because we're getting near to a level and it's. And. And then we're going to be professional podcasters.

Ron: Fucking hell.

Ron: He's waited weeks for this.

Laura: Yeah, and I've garbaged it. Luke will be working for free, so.

Laura: Thanks for that, Luke.

Laura: In fact, you're paying us, so you're working for minus money. Very nice of you. Thank you, mate. Thank you for agreeing that for the rest of the podcast, you will make sure everything sounds professional, including cutting all the coughing out of this intro and outro.

Ron: Thank you.

Laura: And, ah, that bang of whatever Ron.

Ron: Just touched, that was a wire.

Laura: Yeah, cut that out, Luke. We don't need that. The light in your room's really changed. Even as we've been recording Ron Sun's.

Ron: M coming up because it's early.

Laura: It is very early. Um, okay.

Ron: Our listeners have proper jobs. They don't think it's early.

Laura: Oh, I've been up for like an hour and a half.

Ron: Yeah, but you're still your. Your clock, your internal clock is still late because of your job.

Laura: Oh, hell yeah. Because I won't finish work for 14 hours. Um, anyway, I just want to get this ended so that we can go and do the Grinch. I don't care about this outro until. Go away, everybody. See you soon.

Laura: Bye.

Ron: Pencils down.

00:56:28