3. If the time for a reaction to occur is shortened, the...

3. If the time for a reaction to occur is shortened, the reaction must be going a. faster. b. slower. c. the same rate. d. Its rate cannot be determined from this information. 4. If the time for a reaction to occur is lengthened, the reaction must be going a. faster. b. slower. c. the same rate. d. Its rate cannot be determined from this information. 5. What happens to the rate of reaction if a reactant concentration is: a. raised? b. lowered? 6. What happens to the rate of reaction if the temperature of the reaction is: a. raised? b. lowered?

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00:01 So we have some multiple choice questions about rates of reaction.

00:04 The first one is labeled number three.

00:06 If the time for a reaction is shortened, then what happens to the rate? so the time goes down.

00:13 That means that the reaction will be completed in less time.

00:19 So it must be going faster.

00:21 So the rate is going to go.

00:24 Rate must be going faster is answer choice.

00:29 Question number four is the opposite.

00:31 If the time it takes where reaction to car increases, then that means it's a slower reaction.

00:37 So rate goes down.

00:39 So slower is answer choice b for number four.

00:44 All right.

00:45 Then we have number five.

00:47 If the reacting concentration is raised and lowered, what will happen to the rate, respectively? so we'll denote the concentration as like some random thing in brackets.

00:59 If it's raised, and then for part b is if it's lowered.

01:03 So if you have more of a reactant, then that means that you can have more collisions in the same amount of time, and collisions are what make reactions happen quickly.

01:12 So that means the rate is going to go up.

01:15 And if you decrease the amount of reaction, then the rate is going to go down because you won't have as many collisions per unit of time.

01:23 That's not multiple choice...

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