14. Rate of Reactions

Question 1

Rate of reactions can be measured by:

Answer 1

1. The volume of gas produced over time
2. The change in the mass of a reactant or product over time

Question 2

Rate of reactions is determined by:

Answer 2

• Effective collisions: Particles collide with energy that is greater than or equal to the activation energy

Question 3

Rate of Reactions is affected by:

Answer 3

1. Concentration
2. Pressure
3. Temperature
4. Particle Size

Question 4

How does the concentration affect rate of reactions?

Answer 4

1. As the concentration of reactants increases, the number of reacting particles per unit volume increases
2. The reacting particles collide more frequently, increasing the frequency of effective collisions

Question 5

How does pressure affect the rate of reactions?

Answer 5

1. An increase in pressure results in an increase of the number of reactants per unit volume
2. This increases the frequency of effective collisions

Question 6

How does the temperature affect the rate of reactions:

Answer 6

1. As temperature increases, reactant particles have more kinetic energy
2. This would increase the frequency of collisions

Question 7

Particle size

Answer 7

• A decrease in particle size increases the surface area for more effective collisions