Kinetics

Question 1

5 ways to increase rate of reaction

Answer 1

increase temp.
add catalyst
increase conc.
increase s.a. of reactants
increase pressure

Question 2

2 reasons increasing temp. increases rate of reaction

Answer 2

increases energy pf particles, meaning more have above activation energy
increases frequency of collisions as particles move about more

Question 3

3 experimental methods of measuring rate of reaction

Answer 3

change in mass
change in volume using a gas syringe
disappearing cross

Question 4

what a catalyst does and how

Answer 4

increases rate of reaction without being used up by offering an alternative pathway of lower activation energy

Question 5

how does a lower E_a increase rate of reaction

Answer 5

a greater proportion of collisions take place at or above E_a therefore the frequency of successful collisions increases

Question 6

equation for rate of reaction

Answer 6

change in [products] or [reactants]
time

Question 7

how rate of reaction is found from vol. vs time graph

Answer 7

gradient of the curve at any point found by taking a tangent

Question 8

rate equation for A + B > ?

Answer 8

rate = k [A]^a [B]^b
a = order of A

Question 9

finding total order of a reaction

Answer 9

add individual orders of reactants

Question 10

0 order
rate vs conc. graph

Answer 10

horizontal line at zero

Question 11

1st order
rate vs conc. graph

Answer 11

steady positive gradient
line through origin

Question 12

2nd order
rate vs conc. graph

Answer 12

gradient increasing
line through origin

Question 13

what does first order mean

Answer 13

rate of reaction is proportional to concentration of reaction

Question 14

what does zero order mean

Answer 14

change in concentration has no effect on rate of reaction

Question 15

unit for rate of reaction

Answer 15

moldm^-3s^-1

Question 16

how are the orders of a reaction found

Answer 16

through experimental data

Question 17

1^st order k unit

Answer 17

s^-1

Question 18

2^nd order k unit

Answer 18

mol^-1dm³s^-1

Question 19

3^rd order k unit

Answer 19

mol^-2dm⁶s^-1

Question 20

what is the rate determining step

Answer 20

the slowest step in a reaction with the highest E_a

Question 21

link between rate determining step and order

Answer 21

number of molecules in the rate determining step equals the overall order