rates of reactions

Question 1

rate of reaction

Answer 1

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

Question 2

instantaneous rate

Answer 2

rate of reaction at any one particular time during the reaction

Question 3

activation energy

Answer 3

minimum amount of energy that colliding particles must have for a reaction to occur

Question 4

effective collision

Answer 4

one that results in the formation of products

Question 5

non effective collision

Answer 5

one that does not result in products

Question 6

energy profile diagram

Answer 6

graph which shows the change in the energy of a chemical reaction with time as the reaction passes

Question 7

catalyst

Answer 7

a substance that alters the rate of a chemical reaction but is now consumed in the reaction

Question 8

enzyme

Answer 8

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

Question 9

homogeneous catalysis

Answer 9

catalysis in which both the reactants and the catalyst are in the same phase i.e there is not boundary between them

Question 10

heterogeneous catalysis

Answer 10

when the reactants and catalyst are in different phases i.e there is a boundary between them

Question 11

autocatalysis

Answer 11

when one of the products of the reaction acts as a catalyst for the reacion

Question 12

catalytic converter

Answer 12

device in the exhaust system of a motor vehicle which contains catalysts to convert pollutants in the exhaust to less harmful substances

Question 13

catalyst poison

Answer 13

substance that makes the catalyst inactive