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AP Chemistry 1.5 Forming and Breaking Bonds 8 Views


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AP Chemistry 1.5 Forming and Breaking Bonds. What can we expect to see with regard to the current stage of this reaction?

Language:
English Language

Transcript

00:03

Here’s your Shmoop du jour, brought to you by the scientific Time Warp. [Clock ticks rapidly forward]

00:08

It's just a shift to the left, and then a shift to the right.

00:11

Okay, enough Time Warping…here’s our question:

00:14

Consider the following chemical reaction equation…

00:20

Using this equation, if we removed the entire D product from the reaction, what can we expect

00:25

to see with regard to the current stage of this reaction?

00:28

And here are the potential answers:

00:31

To solve this problem, we need to remember Le Châtelier's Principal. [Person photographing men on stage]

00:36

Thank you, 1860s French high school principal Monsieur Talbert.

00:42

We know Henri Louis Le Châtelier couldn’t have [Henri working in a lab]

00:44

developed his chemical equilibrium law without the nurturing school environment you helped

00:49

to create for him.

00:50

Bravo.

00:51

Now that that’s out of the way, we also need to remember Le Châtelier's Principle

00:54

of chemical equilibrium, it says that when a chemical system in dynamic equilibrium is [Teacher writing on the board]

01:02

perturbed by changing the conditions, the equilibrium changes to counteract the perturbation.

01:11

In our chemical reaction, if we remove all of the product D, then Le Châtelier's Principle [Product D removed from chemical reaction]

01:16

tells us that the reaction will adjust to counteract that change by creating more of

01:20

the product D.

01:22

This would correspond to the reaction proceeding from left to right. [Blue ball moves from left to the right]

01:24

It’s kind of like a clown car packed with clowns.

01:27

…Which…come to think of it, really can’t be safe. [Clowns enters small car and drives away]

01:30

But anyway.

01:31

If all the clowns in the back seat get out, some of the other clowns will move to the

01:34

back so the driver can see the road.

01:36

…Seriously, how have police not cracked down on this yet?

01:39

Here’s another way to think about it.

01:40

If our chemical reaction is at dynamic equilibrium, the rate of the forward reaction is exactly

01:45

the same as the rate of the reverse reaction. [D reactants in the woods covered in barbed wire]

01:48

If all of species D were removed, the forward reaction could still proceed at the same rate,

01:54

but the backward reaction could not take place at all since there would be no D available

01:58

to react.

01:59

As a result, the overall net reaction would proceed from left to right.

02:02

So, we can see that the reaction will move from left to right.

02:06

Another way to say the same thing is that the equilibrium will shift to the right.

02:10

This just happens to be answer choice (A), which is the right answer. [Answer A circled green]

02:14

And now if you'd excuse us, we have a few citizens' arrests to make. [Police arresting man riding scooter]

02:16

Keeping the roads safe, one clown car at a time.

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