17 - 4

Question 0

How is rxn rate measured?

Answer 0

TRIANGLE [reactant]/unit time

Question 1

What is rxn rate?

Answer 1

How fast a reaction happens

Question 2

How can rxn rate be determined?

Answer 2

Experiment

Question 3

What is one thing rxn rate determines?

Answer 3

How fast a cake bakes

Question 4

What influences rxn rate?

Answer 4

Nature of the reactions & surface area, T, [. ], & catalyst

Question 5

Define nature of the reactants

Answer 5

Ionic(reacts instantly) or covalent (May take hours)

Question 6

Describe what happens when T increases

Answer 6

Increased T will increase KE which will increase the # of particles with enough energy to “go” WRT E-act

Question 7

Describe what happens when [ ] increases

Answer 7

Will increase KE cuz there are more particles preset to collide

Question 8

Define catalysts

Answer 8

Substances that increase the rate of a rxn without being involved in rxn

Question 9

How do catalysts work?

Answer 9

By decreasing e-Act

Question 10

When will a catalyst be homogenous?

Answer 10

WRT reactants (of the same phase)

Question 11

When will catalysts be heterogeneous?

Answer 11

WRT reactants (different phases)

Question 12

What’s the opposite of a catalyst?

Answer 12

Inhibitor

Question 13

What is an inhibitor also known as?

Answer 13

Preservative

Question 14

Define preservative

Answer 14

Stops or slows a rxn by forming stable, nonreactive intermediate species w/ reactants, keeping to busy to react

Question 15

Define rate laws

Answer 15

Mathematical expressions that relate the rate of a rxn to the [ ]’s of thee reactants

Question 16

How do you write a rate law?

Answer 16

1. ) Keep [ ] of reactants constant & time it
2. ) vary the [ ] of one & time it again
3. ) vary the [ ] of the other & time it again

Question 17

When is rxn rate 1st order?

Answer 17

Double-double

Triple-triple

Question 18

When is rxn rate 2nd order?

Answer 18

Double-quadruple

Triple- 9 fold