CHEM 112 Exam 2

Question 1

What is Chemical Kinetics?

Accepted Answer

When physics and chemistry have a baby, How fast a reaction takes place

Question 2

What is the Reaction order [A]=t

Accepted Answer

Zero

Question 3

The rate of appearance and disappearance in the same chemical reaction will be the same.

Accepted Answer

False

Question 4

__________ shows the relationship between concentration and rate

Accepted Answer

Rate Law

Question 5

Using 5A--> 2B, If the rate of disappearance of A is 4.0 M/s, what is the rate of appearance of B?

Accepted Answer

1.6

Question 6

What is the Rate law of NH4+?

Accepted Answer

???????, ?????, ??????, ??????

Question 7

What is the Reaction order 1/[A] vs t.

Accepted Answer

Second

Question 8

You have 750 g of a substance. How much sample will be present after 6 half lives?

Accepted Answer

12g

Question 9

Rate of Appearance contains a negative sign in the equation.

Accepted Answer

False

Question 10

Rate Constants depend upon concentration but Reaction Rate do not.

Accepted Answer

False

Question 11

Using 5A--> 2B, If the rate of disappearance of A is 4.0 M/s, what is the rate of reaction? (Double check this is right)

Accepted Answer

0.8

Question 12

At 300 seconds the Molarity of C4 H9 Cl is 0.0549. At 400 seconds the Molarity decreases to 0.0448. What is the Av. Rate

Accepted Answer

.0001

Question 13

Slope of line at desired time.

Accepted Answer

Instantaneous Rate

Question 14

What is the Reaction order ln [A] vs t.

Accepted Answer

First

Question 15

The half life of the sample is 420 years. How many years does it take a 1000g sample to become 62.5 g?

Accepted Answer

1680 years

Question 16

Write the Rate of Reaction for this Equation. 4C + S8 --> 4CS2

Accepted Answer

−Δ[C]/4Δ𝑡=−Δ[S8]/Δ𝑡=Δ[CS2]/Δ4𝑡

Questions 16