Rates of reaction

Question 1

what are the units of rate?

Answer 1

mol dm-3 s-1

Question 2

what is zero order?

Answer 2

the concentration of the reactant has no effect on the rate

Question 3

what is first order?

Answer 3

the rate depends on the concentration to the power of 1

Question 4

what is second order?

Answer 4

the rate depends on the concentration to the power of 2

Question 5

where does the overall order come from?

Answer 5

the sum of the orders of the reactants

Question 6

what are 3 ways of continuous monitoring?

Answer 6

gas collection, mass loss, colour change

Question 7

what does a colorimeter measure?

Answer 7

light absorption

Question 8

what is the gradient equal to?

Answer 8

the rate

Question 9

what is the half life?

Answer 9

the time taken for half of the reactant to be used up

Question 10

what is the name for a constant half life?

Answer 10

exponential decay

Question 11

how do you determine the rate constant?

Answer 11

calculate from the rate by drawing a large tangent.

Question 12

which order has a constant half life?

Answer 12

first

Question 13

what is an example of a clock reaction?

Answer 13

Iodine and starch colour change

Question 14

what is necessary for a reaction to take place?

Answer 14

right orientation and enough energy

Question 15

what is the slowest step?

Answer 15

the rate determining step

Question 16

what are haloalkanes hydrolysed with?

Answer 16

hot aqueous alkali

Question 17

how do you find the overall reaction?

Answer 17

the sum of the reaction steps

Question 18

what happens to rate when temperature increases?

Answer 18

it increases

Question 19

what is the change in rate mainly determined by?

Answer 19

activation energy

Question 20

what is the Arrhenius equation?

Answer 20

the exponential relationship between the rate constant and temperature

Question 21

what type of graph is produced from the Arrhenius equation?

Answer 21

straight line downwards