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AP Chemistry Videos 54 videos

AP Chemistry 1.3 Chemical Reaction Rates
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AP Chemistry 1.3 Chemical Reaction Rates. What is the overall order of the reaction?

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AP Chemistry 1.5 Chemical Reaction Rates
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AP Chemistry 1.5 Chemical Reaction Rates. What is the rate law for the reaction?

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AP Chemistry 1.1 Rearrangement and Reorganization of Atoms 240 Views


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AP® Chemistry: Rearrangement and Reorganization of Atoms Drill 1, Problem 1. Which of the following sets of coefficients correctly balances the below equation in the lowest whole number ratio?

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Transcript

00:03

Here's your shmoop du jour, brought to you by Hot Tea.

00:06

If you spill it in your lap, it will burn for an Oolong time.

00:20

Damon decides to make a cup of hot tea by heating water with a gas stove.

00:26

The gas stove works through a combustion reaction involving methane gas, or CH4, and oxygen gas.

00:35

Which of the following sets of coefficients correctly balances the below equation in the

00:40

lowest whole number ratio?

00:43

And here are your potential answers...

00:50

So this question is asking us to find the lowest whole number ratio to balance the equation.

00:57

If we take a quick look at the answers first, we know C can't be the right answer because

01:01

2, 4, 2, and 4 can be reduced to 1, 2, 1, and 2 by dividing all the numbers by 2.

01:07

So we can immediately eliminate C.

01:13

Now, let's figure out what will make this equation work. Other than, you know... offering

01:17

it a possible raise.

01:20

Well, in chemistry, according to the law of conservation of mass, there needs to be the

01:25

same number of atoms of each element on both sides of the equation.

01:29

Which means we can treat the arrow like an equals sign.

01:32

For this equation, we know there needs to be the same number of Carbon, Oxygen, and

01:36

Hydrogen atoms on the right side of the arrow as there are on the left.

01:41

To do this, we can place coefficients in front of the formulas to try to get equal numbers.

01:47

Let's try A. If we had 1, 1, 1, and 1...we'd have 1 Carbon on both sides, 4 hydrogens on

01:55

the left and 2 on the right...ok, we can stop there. That doesn't work.

02:01

B... 1, 2, 1, and 2. 1 Carbon on both sides, 4 hydrogens on the left and 2 times 2 for

02:10

4 hydrogens on the right.

02:13

2 times 2 is 4 for 4 oxygens on the left...and 2 plus 2 for 4 oxygens on the right.

02:21

The coefficients in answer B give us the same number of atoms on the left and right... which

02:25

is going to save us a bit of busy work.

02:27

Looks like B's our answer.

02:29

Now for Damon's next big task: getting the honey for his tea directly from the source...

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