Rate Equation/Orders Of Reaction

Question 1

Define rate equation

Answer 1

The change in concentration of a reactant or a product in a given time

Question 2

Define order of reaction

Answer 2

The power to which the concentration of a reactant is raised in the rate reaction

Question 3

Define rate constant

Answer 3

The constant that links the rate of reaction with the concentrations of the reactants raised to the powers of their orders in the rate equation

Question 4

Describe the shape of a concentration time graph for a first order reactant

Answer 4

Straight line through the origin

Question 5

Describe the shape of a concentration time graph for a second order reactant

Answer 5

Curve through the origin

Question 6

Describe the shape of a concentration time graph for a zero order reactant

Answer 6

Straight line not through origin

Question 7

Describe the shape of a concentration time graph for the square of a second order reactant

Answer 7

Straight line through the origin

Question 8

Why when testing the effect of concentration of a reactant on rate of reaction must other reactants be in a large excess?

Answer 8

To ensure that the concentration of the other reactants does not affect rate of reaction

Question 9

What is half-life?

Answer 9

The time taken for concentration of a reactant to fall to half its original value

Question 10

What is true about the values for half life for 1st order reactants?

Answer 10

They are constant/they stay the same

Question 11

Give the expression for k in terms of half life

Answer 11

k= ln2/half life