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AP Chemistry 3.4 Laws of Thermodynamics 2 Views


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AP Chemistry 3.4 Laws of Thermodynamics. What is the specific heat of the metal?

Language:
English Language

Transcript

00:04

And here's your Shmoop du jour, brought to you by specific heat. [Fire rising]

00:07

If it’s too specific, all of those adjectives can get pretty annoying…

00:12

Alright, here's the question.

00:13

In the lab, Bubba is trying to determine the identity of a metal by its specific heat. [Bubba wearing a lab coat]

00:18

Here is the data he collected.

00:24

What is the specific heat of the metal, given that the specific heat of water is ~4 J/g?celcius.

00:32

And here are your potential answers.

00:35

Hey, maybe if we help Bubba figure out his problem, he’ll give us some free shrimp. [Bubba at the shrimp store]

00:41

Nothing motivates like seafood.

00:42

All right, let’s take a look at the data that Bubba collected.

00:45

It appears that he placed a hotter piece of metal in cooler water, then measured the temperature

00:49

of the metal-water mixture. [Bubba with a piece of metal in hot water]

00:51

How can we determine the specific heat of the metal with this data?

00:54

Well, specific heat, or Cp, refers to the amount of heat required

00:58

to raise the temperature of 1 gram of a substance by 1°C.

01:02

In order to find the specific heat of the metal, we need to know how much heat was transferred [Piece of metal in a bed of water]

01:07

from the metal to the water.

01:09

We were given the specific heat of the water, the mass of the water, and the temperature

01:12

change of the water, so we can calculate the heat that the water must have absorbed using

01:16

the equation heat equals mass times the heat capacity times the change in

01:21

temperature.

01:22

Due to the law of conservation of energy, we can assume that the same amount of energy

01:28

is released by the metal.

01:30

Using the same equation, we can calculate our unknown Cp. [Equation for calculating Cp]

01:33

All right, now it’s time for our favorite part, doing the math!

01:37

Do the math do the math do the maaaath, do the math do the math do the maaaath…

01:43

Alright we're done. Choice B is the one we want.

01:46

And now, it's time for seafood. [Bubba sat at a table waiting for his order of seafood]

01:48

Okay, Bubba, so that’ll be two orders of popcorn shrimp, a shrimp cocktail – anybody

01:52

want some garlic bread?

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