Rates of Reaction

Question 1

What are 2 ways in which you can follow the course of reaction?

Answer 1

continuous methods- measuring volume of gas given off, colorimetry, changes in electrical conductivity

sampling methods

Question 2

What is the rate constant?

Answer 2

the proportionality constant

Question 3

What is the rate of reaction?

Answer 3

is related to concentration of reactants by the rate of reaction

Question 4

What is definition of a half life?

Answer 4

is the time taken for the concentration of a reactant to halve

Question 5

What is the activation energy?

Answer 5

is the minimum energy that colliding particles must have in order to react

Question 6

What is the effect of concentration, pressure and surface on rate of reaction?

Answer 6

temperature- particles gain more energy, move faster, collide more frequently/w more energy

pressure- more particles per unit of volume, collisions more frequent, increases the use of the reaction

surface- increases the use of the reaction, frequency of collisions would higher, high surface area

catalyst- speed up the rate reaction by providing a different reaction path with lower activation energy

enzymes- are proteins which catalyse specific reactions