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A level chemistry A2 Assignment Rates of reaction Question and Answer
This is an a level chemistry rates of reaction assignment with questions and answers
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Q1.Solutions of two compounds, W and X, react together in the presence of a soluble catalyst, Y,
as shown in the equation
2W + X → Z
When the concentrations of W, X and Y are all doubled, the rate of reaction increases by a
factor of four.
Which is a possible rate equation for this reaction?
A rate = k [W]2 [X]
B rate = k [W]2 [Y]
C rate = k [X] [Y]
D rate = k [X] [Z]
(Total 1 mark)
Q2.
A rate investigation was carried out on a reaction involving three reactants, X, Y and Z.
The concentrations of the reactants were varied and the relative rate for each mixture
determined.
Experiment [X]/mol dm−3 [Y]/mol dm−3 [Z]/mol dm−3 Relative rate
1 1 × 10−3 1 × 10−3 2 × 10−3 1
2 2 × 10−3 2 × 10−3 2 × 10−3 4
3 5 × 10−4 2 × 10−3 4 × 10−3 0.5
The reaction is zero order with respect to Y.
What is the overall order of reaction?
A 0
B 1
C 2
D 3
(Total 1 mark)
, Q3.
A series of experiments was carried out to find the order of reaction with respect to reactant X.
In these experiments, only the concentration of X was changed.
Which graph would show that the reaction is second-order with respect to X?
A
B
C
D
(Total 1 mark)
Q4.
The rate equation for the hydrogenation of ethene
C2H4(g) + H2(g) C2H6(g)
is Rate = k[C2H4][H2]
At a fixed temperature, the reaction mixture is compressed to triple the original pressure.
What is the factor by which the rate of reaction changes?
A 6
B 9
C 12
D 27
(Total 1 mark)
Q5.
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