transfer

Question 1

define rate of reaction

Answer 1

the change in concentration of a reactant or product per unit time

Question 2

whats zero order

Answer 2

when the conc. of a reactant has no effect on rate, the reaction is zero order with respect to the reactant.
zero order: rate ∝ [A]^0
in a zero order reaction:
- any number raised to the power of zero is 1
- concentration doesn’t influence the rate

Question 3

state the graph in zero order

Answer 3

the graph shows rate of reaction doesn’t change with conc.
-this means the conc. has no effect on the rate of reaction, this is classified as zero order
-if zero order, the half life decreases with time
(zero order is a straight line graph (downwards))

Question 4

whats first order

Answer 4

a reaction is first order with respect to the reactant when the rate depends on its conc. when raised to the power of 1
first order: rate ∝ [A]^1
in a first order reaction:
- if the conc. of A is doubles (x2), the reaction increases by a factor of 2^1=2
-if a conc. is tripled its 3^1=3

Question 5

state the graph in first order

Answer 5

this graph shows rate does change when the conc. is changed.
-as the conc. halves, so does the rate of reaction, in first order half life is constant
(downwards sloping curve)

Question 6

whats second order

Answer 6

-a reaction is second order with respect to a reactant when the rate depend on its conc raised to the power of 2.
second order: rate ∝ [A]^2
in a second order reaction:
-if the conc. of A is doubled (x2), the reaction rate increases by a factor of 2^2 =4
-if tripled, its 3^2= 9

Question 7

state the graph in second order

Answer 7

this graph shows rate does change when conc. is changed.
as the conc. changes, the rate of reaction changes by that factor squared e.g. double the conc.= quadruple the rate.
in second order the half life increases!
(downwards sloping curve)