AP MCQ 05ABCDEFGHIJK PART 1

Question 01:

A reaction that is considered to be fast, is likely to have which of the following characteristics?

A high activation energy
A high temperature
A low collision frequency
Reactants in low concentrations

Question 02:

Which of the following changes in conditions will definitely result in an increase in the rate of a reaction?

Decreasing the temperature and decreasing the concentration of reactants
Decreasing the temperature and increasing the concentration of reactants
Increasing the temperature and increasing the concentration of reactants
Increasing the temperature and decreasing the concentration of reactants

Question 03:

Increasing the temperature of a reaction increases the rate. Why?

At higher temperatures more particles possess the activation energy
At higher temperatures the frequency of collisions increases
At higher temperatures the concentration of particles increases
At higher temperatures more particles possess the activation energy AND the frequency of collisions increases

Question 04

In a reaction involving gases, which list contains factors that ALL contribute to the rate?

The volume of the reaction vessel, the temperature and the color of the gases
The volume of the reaction vessel, the temperature and the pressure of the gases
The color of the gases, the concentration of the gases and the temperature of the gases
The volume of the reaction vessel, the temperature and the color of the gases

Question 05:

In a reaction that involves solid magnesium carbonate, it is observed that when the carbonate is ground into a fine powder, that the reaction occurs at an increased rate. What is the best explanation for this observation?

When powdered, the carbonate increases in temperature meaning more particles possess the activation energy
When powdered, the carbonate increases in concentration meaning there are more collisions
When powdered, the carbonate reduces the activation energy
When powdered, the surface area of the carbnate is increased, and with it there are a greater number of collisions

Question 06:

In the reaction between zinc and hydrochloric acid (below) it is found that the rate of production of hydrogen over time, decreases. What is the best explanation for this observation?

Zn_(s) + 2HCl_(aq) → ZnCl_2(aq) + H_2(g)

Over time, the concentration of hydrogen increases
Over time, hydrogen gas reduces the temperature
Over time, the reactant concentration decreases so fewer collisions occur
Over time, the zinc chloride solution cools the solution

Question 07:

Decreasing the volume of a vessel that houses a gaseous chemical reaction that ultimately goes to completion, will have which of the following effects, and for what reason?

An increased rate, since the concentration is decreased
An increased rate, since more collisions occur
An increased amount of products, since the concentration is increased
An increased amount of products, since more collisions occur

Question 08:

When solid zinc metal reacts with an aqueous solution of hydrochloric acid, which factors are relevant in determining the rate of the reaction?

Temperature and surface area only
Temperature and concentration only
Concentration and surface area only
Temperature, concentration and surface area

Question 09:

When the temperature of a reaction mixture of gases is increased, the Maxwell-Boltzmann distribution of energies is observed to shift. What can be said of the total area underneath the distribution curve for the higher temperature, when compared to the lower temperature?

It is greater under the higher temperature curve since at the higher temperature more particles possess the activation energy or higher
It is smaller under the higher temperature curve since at the higher temperature more particles possess the activation energy or higher
It is the same under each curve, since the area underneath the curves represents the total number of molecules
It is greater under the lower temperature curve since at the lower temperature more particles possess the activation energy or higher