Chapter 16 - Sec 2

Question 1

Key factors that influence the rate of chemical reactions

Answer 1

Reactivity, concentration, surface area, temperature, and catalysts

Question 2

Raising the temperature of a reaction generally:

Answer 2

Increases the rate of the reaction by increasing the collision frequency and the number of collisions that from an activated complex

Question 3

Catalysts increase the rates of chemical reactions

Answer 3

by lowering the activation energies

Question 4

Why does magnesium metal reacts with hydrochloric acid at a faster rate than iron does?

Answer 4

Magnesium is a more active metal than iron, which mean that magnesium is more reactive.

Question 5

Explain how collision theory accounts for the effect of concentration on reaction rate

Answer 5

Increasing reactant concentration increases collision frequency between reactant particles

Question 6

Describe the effect on the rate of a reaction if one of the reactants is ground to a powder rather than used as a single chunk

Answer 6

The rate of reaction increases because more surface area is available for the reaction

Question 7

Explain the difference between a catalyst and an inhibitor

Answer 7

A catalyst speeds up the rate of a reaction by lowering the activation energy. An inhibitor slows or even stops a reaction by interfering with the reactants or with the catalyst

Question 8

If increasing the temperature of a reaction by 10 K approximately doubles the reaction rate, what would be the effect of increasing the temperature by 20 K

Answer 8

The rate would quadruple