Rates of Reactions

Question 1

Rate of reaction is defined as

Answer 1

The change in concentration per unit time of any one reactant or product

Question 2

Instantaneous rate of reaction

Answer 2

The rate of reaction at any one particular time during the reaction

Question 3

Factors affecting rate of reactions

Answer 3

1. Nature of reactants
2. Particle size
3. Concentration
4. Temperature
5. Catalysts

Question 4

Catalyst

Answer 4

A substance that alters the rate of a chemical reaction but is not consumed in the reaction

Question 5

Enzyme

Answer 5

Substance that is produced by living cell and acts as a biological catalyst

Question 6

Homogeneous catalysis

Answer 6

Catalysis in which both the reactants and the catalyst are in the same phase (no boundary between)

Question 7

Heterogeneous catalysis

Answer 7

Catalysis in which the reactants and the catalyst are in different phases (there is a boundary between)

Question 8

Autocatalysis

Answer 8

Catalysis in which one of the products of the reaction act as a catalyst for the reaction

Question 9

Catalyst poison

Answer 9

A substance that makes a catalyst inactive

Question 10

Effective collision

Answer 10

A collision that results in the formation of products

Question 11

Activation energy

Answer 11

The minimum energy required for effective collisions between particles to occur