AQA GCSE · Combined Science: Trilogy 8464

Chemical changes: Practice Questions

5 multiple-choice questions marked as you go, and 1 written questions with worked solutions. All on Chemical changes.

6 questions7 marksFree, no account

Question 1

1 mark

In the reactivity series, where are the non-metals hydrogen and carbon often placed to help predict displacement reactions?

Question 2

1 mark

During the electrolysis of molten aluminium oxide, cryolite is added to the aluminium oxide. What is the primary purpose of adding cryolite in this industrial process?

Question 3

1 mark

The reaction for the formation of ammonia is shown below:
\(N_{2}(g) + 3H_{2}(g) \rightleftharpoons 2NH_{3}(g)\) (The forward reaction is exothermic)

According to Le Chatelier's Principle, what would be the effect of increasing the pressure on this system at equilibrium?

Question 4

1 mark

A student reacts an excess of magnesium with 25.0 cm³ of hydrochloric acid. Which of the following observations would indicate that a chemical change has occurred?

Question 5

1 mark

When an aqueous solution of sodium chloride is electrolysed using inert electrodes, what are the products formed at the cathode and the anode?

Question 6

2 marks

Identify the color a strong acid turns universal indicator and state its approximate pH value.

Write your answer out first, then check it against the worked solution.

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