3.1.9 Rate equations (A-level only)

Quiz
•
Chemistry
•
9th - 12th Grade
•
Hard
+1
Standards-aligned
Rebecca Howe
Used 5+ times
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35 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
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?
rate = k [W]2 [X]
rate = k [W]2 [Y]
rate = k [X] [Y]
rate = k [X] [Z]
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
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.
The reaction is zero order with respect to Y.
What is the overall order of reaction?
0
1
2
3
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
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?
6
9
12
27
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
This question is about the reaction between propanone and an excess of ethane-1,2-diol, the equation for which is given in the image.
In a typical procedure, a mixture of 1.00 g of propanone, 5.00 g of ethane-1,2-diol and 0.100 g of benzenesulphonic acid, C6H5SO3H, is heated under reflux in an inert solvent. Benzenesulphonic acid is a strong acid.
When the concentration of benzenesulphonic acid is doubled, the rate of the reaction doubles. It can be deduced that
the reaction is first order overall.
the reaction is third order overall.
the reaction is acid-catalysed.
units for the rate constant, k, are mol−2 dm6 s−1.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Rate = k [A]2 [B]
Correct units for the rate constant in the rate equation above are
mol dm−3 s−1
mol−1 dm−3 s−1
mol2 dm−6 s−1
mol−2 dm6 s−1
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
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
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The rate equation for the acid-catalysed reaction between iodine and propanone is:
rate = k [H+] [C3H6O]
The rate of reaction was measured for a mixture of iodine, propanone and sulfuric acid at pH = 0.70
In a second mixture the concentration of the sulfuric acid was different but the concentrations of iodine and propanone were unchanged. The new rate of reaction was a quarter of the original rate.
What was the pH of the second mixture?
1.00
1.30
1.40
2.80
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