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AP Chemistry 3.3 Laws of Thermodynamics 4 Views


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Description:

AP Chemistry 3.3 Laws of Thermodynamics. How much energy would be required to completely melt the ice?

Language:
English Language

Transcript

00:04

And here's your Shmoop du jour, brought to you by iced tea…A refreshing drink turned

00:09

talented rapper turned even more talented detective on Law and Order SVU. [Iced tea glass transforms from rapper to detective]

00:13

Dun dun.

00:17

Alright, here's today’s question.

00:18

On a hot summer day, there is nothing like a nice, cold glass of iced tea.

00:22

To cool iced tea, the ice cubes must melt.

00:25

How much energy would be required to completely melt 60.0 g of ice at 0 °C?

00:31

The heat of fusion for ice equals 6.01 kJ/mol.

00:36

And here are your potential answers.

00:39

All right, for the quantitative part of this problem, we need to think about water. [Person using a calculator]

00:43

Ah, so peaceful…

00:44

…Darn it.

00:45

Now we need a bathroom…[Toilet flushes]

00:47

Okay, where were we?

00:48

Oh, yeah, science.

00:50

Great.

00:51

So, we're given a heat of fusion, which is the amount of energy needed to melt one mole

00:54

of ice at 0°C.

00:55

To calculate the amount of energy needed to melt 60 grams of ice, we have to convert this [Robot shoots a laser and melts ice cubes]

01:01

weight to moles using the molecular weight of water.

01:04

Now we can just multiply the number of moles of ice by the heat of fusion to calculate

01:08

the overall heat, Q.

01:10

This question is a great example of why units are your best friend… [Boy juggling with measurement units]

01:13

Sorry, dogs.

01:14

You've been demoted.

01:16

By looking at the units of our answer and the information that we’ve got, we can deduce

01:19

the equation that should be used.

01:21

This is a great trick for when you’re unsure or just want to double check. [Girl scribbling in class]

01:25

It's also just a great party trick in general…y'know, if your thing is getting uninvited to parties. [Boy at a party with 3 upside down red cups]

01:30

Anyway, we can see that the correct answer is choice C, - 20 kJ.

01:34

All right, Fido, you can come back now.

01:37

We’re ready to play. [Boy shouts for Fido to come play]

01:39

Fido?

01:40

Where are you?

01:41

We were just kidding about that best friend thing… [Fido on the sofa reading a newspaper]

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