Skip to content
MathsGenie logo
Open app

Course home

  1. A Level
  3. Chemistry OCR A
  5. Question bank

How fast?

EasyMediumHard
12345678910111213141516171819202122
Question 19

A student investigates the rate of hydrolysis of 2-chloro-2-methylpropane in a solvent mixture of ethanol and water.

The student mixes 5.0 cm3 of 0.16 mol dm-3 2-chloro-2-methylpropane dissolved in ethanol with 45.0 cm3 of water. Because water is in a massive excess, the reaction is effectively zero-order with respect to water.

The concentration of 2-chloro-2-methylpropane is monitored over time, and the student plots a graph of the concentration of 2-chloro-2-methylpropane against time, as shown below:

A graph of the concentration of 2-chloro-2-methylpropane against time.

a.

Using collision theory, explain why the gradient of the curve decreases over time.

[3]
b.

Use the graph to determine:

  1. the order of reaction with respect to 2-chloro-2-methylpropane,
  2. the rate of reaction at 10.0 minutes10.0\text{ minutes}10.0 minutes (include units),
  3. the rate constant, kkk (include units).
[7]

How fast? Questions

  1. A Level
  2. /Chemistry
  3. /How fast?