Skip to content

Course home

6.2 Reversible reactions and dynamic equilibrium

6.2 Reversible reactions and dynamic equilibrium

EasyMedium
12345678910
Question 1
67%

This question is about cobalt chloride.

Pink hydrated cobalt chloride turns blue when it is heated. The word equation for the reaction is:

hydrated cobalt chloride (pink)⇌anhydrous cobalt chloride (blue)+water \text{hydrated cobalt chloride (pink)} \rightleftharpoons \text{anhydrous cobalt chloride (blue)} + \text{water} hydrated cobalt chloride (pink)⇌anhydrous cobalt chloride (blue)+water
a.

What does the symbol ⇌\rightleftharpoons⇌ mean?

[1]
b.

A student heats 4.0 g4.0\text{ g}4.0 g of hydrated cobalt chloride in a boiling tube. 1.8 g1.8\text{ g}1.8 g of water is given off. The remaining solid is anhydrous cobalt chloride.

Calculate the mass of anhydrous cobalt chloride produced.

[2]
c.

A student heats 4.0 g4.0\text{ g}4.0 g of hydrated cobalt chloride in a boiling tube. 1.8 g1.8\text{ g}1.8 g of water is given off. The remaining solid is anhydrous cobalt chloride.

Calculate the percentage of water contained in the 4.0 g4.0\text{ g}4.0 g of hydrated cobalt chloride.

[2]
Markscheme

6.2 Reversible reactions and dynamic equilibrium Questions

  1. GCSE
  2. /Chemistry
  3. /6.2 Reversible reactions and dynamic equilibrium

21 exam-style questions on AQA GCSE Chemistry 6.2 Reversible reactions and dynamic equilibrium, covering 6.2.1 Reversible reactions, 6.2.2 Energy changes and reversible reactions, 6.2.3 Equilibrium, 6.2.4 The effect of changing conditions on equilibrium (HT only), 6.2.5 The effect of changing concentration (HT only), 6.2.6 The effect of temperature changes on equilibrium (HT only), and 6.2.7 The effect of pressure changes on equilibrium (HT only). Each one has a worked solution and a mark scheme showing where the marks go.

Question bank