RoR And Collision Theory

Question 1

What is the definition of the rate of reaction?

Answer 1

The rate of reaction is the speed at which reactants are converted into products in a chemical reaction.

Question 2

True or False: The rate of reaction is always constant throughout the reaction.

Answer 2

False

Question 3

What factors can affect the rate of reaction?

Answer 3

Temperature, concentration of reactants, surface area, and the presence of catalysts.

Question 4

Fill in the blank: According to collision theory, for a reaction to occur, particles must collide with sufficient _____ and proper _____ .

Answer 4

energy; orientation

Question 5

What is collision theory?

Answer 5

Collision theory states that for a reaction to occur, reactant particles must collide with enough energy and the correct orientation.

Question 6

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

Answer 6

C) Color

Question 7

What is the effect of temperature on the rate of reaction?

Answer 7

Increasing temperature generally increases the rate of reaction.

Question 8

True or False: Catalysts increase the activation energy of a reaction.

Answer 8

False

Question 9

What is activation energy?

Answer 9

Activation energy is the minimum energy required for a chemical reaction to occur.

Question 10

Fill in the blank: The greater the _____ of reactants, the higher the rate of reaction.

Answer 10

concentration

Question 11

Short Answer: How does surface area affect the rate of reaction?

Answer 11

A larger surface area increases the rate of reaction by allowing more collisions to occur.

Question 12

True or False: A catalyst is consumed in a chemical reaction.

Answer 12

False

Question 13

What role do catalysts play in chemical reactions?

Answer 13

Catalysts speed up reactions by lowering the activation energy without being consumed.

Question 14

Multiple Choice: Which of the following increases the rate of reaction? A) Decreasing concentration B) Increasing temperature C) Using a catalyst D) Both B and C

Answer 14

D) Both B and C

Question 15

What is the relationship between concentration and the rate of reaction?

Answer 15

As concentration increases, the rate of reaction typically increases.

Question 16

Fill in the blank: The _____ of reactant particles affects how often they collide.

Answer 16

speed

Question 17

Short Answer: Why do reactions slow down over time?

Answer 17

Reactions slow down as reactants are consumed and their concentrations decrease.

Question 18

True or False: Increasing the pressure of gases generally increases the rate of reaction.

Answer 18

True

Question 19

What is the effect of a catalyst on the energy profile of a reaction?

Answer 19

A catalyst lowers the activation energy, thus changing the energy profile to require less energy for the reaction.

Question 20

Multiple Choice: Which of the following statements is true? A) All reactions are fast B) All reactions require a catalyst C) Reactions occur at different rates D) Reactions cannot be reversed

Answer 20

C) Reactions occur at different rates

Question 21

What is the effect of surface area on solid reactants?

Answer 21

Increasing the surface area of solid reactants increases the rate of reaction.

Question 22

Fill in the blank: The rate of reaction can be measured by the change in _____ or _____ over time.

Answer 22

concentration; mass

Question 23

Short Answer: What is meant by ‘reaction mechanism’?

Answer 23

A reaction mechanism is the step-by-step sequence of elementary reactions by which overall chemical change occurs.

Question 24

True or False: All collisions between particles result in a reaction.

Answer 24

False

Question 25

What is meant by ‘effective collision’?

Answer 25

An effective collision is one that results in a chemical reaction, occurring with proper energy and orientation.

Question 26

Multiple Choice: The term ‘rate law’ refers to: A) The speed of a reaction B) The relationship between the rate of a reaction and the concentration of reactants C) The temperature of a reaction D) The energy required for a reaction

Answer 26

B) The relationship between the rate of a reaction and the concentration of reactants

Question 27

What is the primary factor that determines if a collision will lead to a reaction?

Answer 27

The energy and orientation of the colliding particles.

Question 28

Fill in the blank: The rate of reaction can be expressed as the change in _____ of reactants or products over time.

Answer 28

concentration

Question 29

Short Answer: How does temperature affect the kinetic energy of particles?

Answer 29

Increasing temperature increases the kinetic energy of particles, leading to more frequent and effective collisions.

Question 30

True or False: The rate of reaction is independent of the physical state of the reactants.

Answer 30

False

Question 31

What is the effect of increasing pressure on gaseous reactions?

Answer 31

Increasing pressure increases the concentration of gas particles, leading to a higher rate of reaction.

Question 32

Multiple Choice: Which of the following is NOT a characteristic of catalysts? A) They are consumed in the reaction B) They lower activation energy C) They speed up reactions D) They can be reused

Answer 32

A) They are consumed in the reaction