Question

Answer the three multiple choice questions with the right choice

1. Which statement does not represent a rate?

Question 1 options:

a)	It takes 15 min to walk to the store.

b)	A cat eats three cans of wet food per week.

c)	The half-life of an element is 12.4 h.

d)	The speed of a car is 45 km/h.

e)	A family consumes 4 L of milk every three days.

2. Which factor will not affect the rate of the following reaction?
Na_(s) + AgNO_3(aq) ® NaNO_3(aq) + Ag_(s)

Question 2 options:

a)	the addition of a catalyst

b)	an increase in pressure

c)	an increase in the concentration of AgNO3(aq)

d)	an increase in temperature

e)	all of these factors will have a strong effect on the rate of the reaction

3. Which step of a reaction is the rate-determining step?

Question 3 options:

a)	the slowest step

b)	the fastest step

c)	the last step of the reaction mechanism

d)	the step with the greatest number of molecules

e)	the first step

Answer 1

1. Which statement does not represent a rate?

Answer is:

a) It takes 15 min to walk to the store

2. Which factor will not affect the rate of the following reaction?
Na_(s) + AgNO_3(aq) ® NaNO_3(aq) + Ag_(s)

Answer is: In this reactio no gas is generated, so if you increse pressure is doese not effect to rate of the reaction.

b)	an increase in pressure

3. Which step of a reaction is the rate-determining step?

Answer is: In any reactio the overall reaction rate is determined by the rates of the steps up to the slowest elementary step. The slowest step in a reaction mechanism is called the rate determining or rate limiting step.

a) the slowest step.