Rate of Reaction (D)

Question 1

State all the factors that affect the rate of reaction.

Answer 1

• Concentration of Reactants
• Temperature of Reactants
• Pressure of Gas Reactants
• Particle Size of Solid Reactants
• Presence of Catalyst

Question 1

What is activation energy?

Answer 1

Activation energy is** the least amount of energy that colliding reactant particles must possess to react with each other.**

Question 2

How does an increase in concentration of reactants affect rate of reaction?

Answer 2

More particles per unit volume → Frequency of effective collisions increases → rate of reaction increases

Question 3

How does an increase in temperature affect rate of reaction?

Answer 3

Particles gain energy and move faster → more particles have energy ≥ activation energy → Frequency of effective collisions increases → rate of reaction increases

Question 4

How does an increase in pressure affect rate of reaction?

Answer 4

Particles are forced closer together in a smaller volume → More particles per unit volume → Frequency of effective collisions increases → rate of reaction increases

Question 5

How does an increase in particle size affect rate of reaction?

Answer 5

Lower surface area for particles to collide → Frequency of effective collisions decreases → rate of reaction decreases

Question 6

How does a catalyst affect rate of reaction?

Answer 6

Provides an alternative pathway of lower activation energy for the reaction to occur → more reactant particles will have energy ≥ activation energy → rate of reaction increases

Question 7

There will only be an increase in yield of a reaction when…

Answer 7

the number of molesof the limiting reactant is increased