M5 Rates
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Conc x 2 Rate x 2 State the order of reaction
Order 1
Conc x 3 Rate x 9 State the order of reaction
order 2
Conc x 4 Rate stayed the same State the order of reaction
order 0
Chemical A is order 1 [A] x 2 [B] x 2 Rate x 2 State the order for Chemical B
B is order 0
Chemical A is order 1 [A] x 4 [B] x 2 Rate x 16 State the order for Chemical B
B is order 2
Chemical A is order 2 [A] x 2 [B] x 1/2 Rate x 2 State the order for Chemical B
B is order 1
State the order
Order 0 Constant negative gradient Shows rate is constant and independent of conc
State the order
Order 2
State the order
Order 1 Directly proportional
State the order
Order 0 Constant rate independent of conc
How can half lives prove if it is order 1?
Constant half life
State the equation used to calculate k from half life
k = ln2/T1/2
How can Ea be calculated from an Arrhenius graph?
gradient x 8.314
How can A be calculated from an Arrhenius graph?
find the intercept lnA = C A = ec
How could rate be measured if a reaction produces a gas?
change in mass at regular time intervals OR volume of gas at regular time intervals
How could you monitor the concentration of bromine?
Colorimeter
How could you monitor the concentration of ethanoic acid?
Titration
What units would k have if the overall order was 1
s-1
What units would k have if the overall order was 2
dm3mol-1s-1
What units would k have if the overall order was 3
dm6mol-2s-1
If the rate equation was: rate = k[NO][O2]2 What would the reactants be in the slow step?
NO + 2O2 –>