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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?
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.
Full Transcript
- 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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