5.1.1: How Fast?

Question 1

Rate of reaction

Answer 1

Change in concentration of product/ reactant per unit time

Question 2

Order of a reaction

Answer 2

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

Question 3

Overall order

Answer 3

The sum of the powers of concentration in a rate equation

Question 4

Rate constant

Answer 4

k, constant of proportionality linking rate and concentration of reactants
Rate = k [X][Y]^2

Question 5

Half life

Answer 5

Time taken for concentration of reactants to half

Question 6

Rate determining step

Answer 6

The slowest step in a reaction mechanism that controls the overall rate

Question 7

Concentration-time graph

Answer 7

0th order: straight diagonal down
1st order: exponential curve down

Question 8

Rate constant

Answer 8

k = (ln2)/(t1/2)

Question 9

Rate-concentration graph

Answer 9

0th order: straight horizontal line
1st order: straight diagonal line up
2nd order: exponential curve up

Question 10

Rate determining step

Answer 10

Only what is in the rate equation should survive, everything else should cancel out