Rates And Equilibrium

Question 1

What is the definition of reaction rate?

Answer 1

The speed at which reactants are converted into products in a chemical reaction.

Question 2

True or False: Increasing the temperature generally increases the rate of a chemical reaction.

Answer 2

True

Question 3

What is the effect of concentration on reaction rate?

Answer 3

Increasing the concentration of reactants usually increases the reaction rate.

Question 4

Fill in the blank: A catalyst _____ the rate of a chemical reaction.

Answer 4

increases

Question 5

What is dynamic equilibrium?

Answer 5

A state in a reversible reaction where the rates of the forward and reverse reactions are equal.

Question 6

What does Le Chatelier’s principle state?

Answer 6

If a system at equilibrium is subjected to a change, the system will adjust to counteract that change.

Question 7

What happens to equilibrium when pressure is increased in a gaseous reaction?

Answer 7

The equilibrium shifts towards the side with fewer moles of gas.

Question 8

Multiple Choice: Which factor does NOT affect the rate of a chemical reaction? A) Temperature B) Surface area C) Color D) Concentration

Answer 8

C) Color

Question 9

What is the role of a catalyst in a chemical reaction?

Answer 9

It lowers the activation energy required for the reaction to occur.

Question 10

True or False: A chemical reaction can reach equilibrium only if it is reversible.

Answer 10

True

Question 11

Short Answer: What is activation energy?

Answer 11

The minimum energy required for a reaction to occur.

Question 12

Fill in the blank: In an exothermic reaction, heat is _____ into the surroundings.

Answer 12

released

Question 13

What is the effect of decreasing temperature on an exothermic reaction at equilibrium?

Answer 13

The equilibrium shifts to the right, favoring the production of products.

Question 14

Multiple Choice: Which of the following will increase reaction rate? A) Decreasing temperature B) Increasing surface area C) Diluting reactants D) Decreasing pressure

Answer 14

B) Increasing surface area

Question 15

What is meant by the term ‘rate constant’?

Answer 15

A proportionality constant in the rate equation that is specific to a given reaction at a specific temperature.

Question 16

True or False: Increasing the surface area of a solid reactant increases the reaction rate.

Answer 16

True

Question 17

What is the effect of adding an inert gas to a reaction at equilibrium?

Answer 17

It has no effect on the position of the equilibrium.

Question 18

Fill in the blank: The _____ of a reaction is measured in moles per liter per second (mol/L/s).

Answer 18

rate

Question 19

Short Answer: Describe what happens to equilibrium when a reactant is added.

Answer 19

The equilibrium shifts to the right, favoring the formation of products.

Question 20

Multiple Choice: Which of the following factors can shift the position of equilibrium? A) Temperature B) Concentration C) Pressure D) All of the above

Answer 20

D) All of the above

Question 21

What is the term for a reaction that can proceed in both forward and reverse directions?

Answer 21

Reversible reaction

Question 22

True or False: In a balanced chemical equation, the total mass of reactants equals the total mass of products.

Answer 22

True

Question 23

What is the significance of the equilibrium constant (K)?

Answer 23

It quantifies the ratio of concentrations of products to reactants at equilibrium.

Question 24

Fill in the blank: An increase in the concentration of products will shift the equilibrium to the _____.

Answer 24

left

Question 25

Short Answer: What is an endothermic reaction?

Answer 25

A reaction that absorbs heat from the surroundings.