Name : ………………………………………………………………..

Date Due : ………………………………………………………………..

| |Year 13 |80% |A |
| | |70% |B |
| |A2 Chemistry |60% |C |
| |2007 - 2008 |50% |D |
| | |40% |E |
| | |Below |U |
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| |13.1 | | |
| |Questions on | |% |
| |Kinetics | | |
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| | | |46 | Section A

1. This question is about the reaction between propanone and an excess of ethane-1,2-diol, the equation for which is given below.

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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

A the reaction is first order overall.

B the reaction is third order overall.

C the reaction is acid-catalysed.

D units for the rate constant, k, are mol–2 dm6 s–1.

| | | | | | | | |Answer: | |
|Directions summarised |
|A |B |C |D |
|1, 2 and 3 |1 and 3 |2 and 4 |4 only |
|only correct |only correct |only correct |correct |

For this question one or more of the options given may be correct. Select your answer by means of the following code

2. Propanone reacts with iodine in acidic solution according to the following equation

CH3COCH3(aq) + I2(aq) ( CH3COCH2I(aq) + H+(aq) + I−(aq)

The rate equation for the formation of iodopropanone is found to be

rate = k [CH3COCH3(aq)][H+(aq)]

Correct statements about this reaction include

1 the reaction rate increases if the temperature is raised.

2 the rate constant increases if the temperature is raised.

3 addition of a small amount of sodium hydroxide