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AP Chemistry 1.1 Laws of Thermodynamics 228 Views


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AP® Chemistry: Laws of Thermodynamics Drill 1, Problem 1. Which equation represents the heat of formation for Calcium Chloride?

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Transcript

00:03

Here's your shmoop du jour, brought to you by Calcium Chloride. Roads need it to grow

00:08

up big and strong. Or... to keep from getting icy, or whatever.

00:13

Which equation represents the heat of formation for Calcium Chloride?

00:18

And here are your potential answers...

00:26

Even if we have no idea about what the heat of formation is... let's think about it. FORMATION.

00:32

We probably want the compound calcium chloride to be on the RIGHT side of the equation...

00:36

since that's what's being FORMED. Which means we can immediately eliminate C.

00:44

So now to learn what a heat of formation equation...is.

00:49

A heat of formation equation shows the elements that make up the compound to be formed, in

00:53

their standard state. It's important that they're in their standard

00:57

state...which is basically whether they're solid, liquid, or gas at room temperature.

01:02

Calcium is a solid at room temperature, and chlorine is a gas at room temperature...

01:06

but a diatomic molecule...

01:13

Meaning that it looks like Cl 2, not 2 Cl.

01:17

These two molecules are in their standard states in option (D).

01:21

D's our answer. We haven't had so much fun with formation

01:24

since we got that lifetime supply of Play-doh...

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