Chemistry 8462: Energy Changes Topical Past Paper Questions
AQA GCSE Chemistry (8462) past-paper questions on Energy Changes, free. This topic is frequently examined across 7 exam sessions. Sign in for the full topic-segregated question bank and AI worksheets.
Sample questions
This question is about water. ## 1 Hydrogen gas reacts with oxygen gas to produce water Water is decomposed into hydrogen gas and oxygen gas using electricity. Which two words describe the reaction between hydrogen gas and oxygen gas? [2 marks] Tick (✓) two boxes. 2 Water molecul…
This question is about hydrogen and compounds of hydrogen. Figure 3 shows the displayed formulae for the reaction between hydrogen and chlorine. ## Figure 3 $$ \mathrm{H-H} \quad +\quad \mathrm{Cl}-\mathrm{Cl} \quad \longrightarrow \quad 2\mathrm{H}=\mathrm{Cl} $$ Table 4 shows t…
Sodium carbonate reacts with hydrochloric acid in an exothermic reaction. The equation for the reaction is: $$ \mathrm{Na_{2}CO_{3}(s)~+~2HCl(aq)~\rightarrow~2NaCl(aq)~+~CO_{2}(g)~+~H_{2}O(l)} $$ A student investigated the effect of changing the mass of sodium carbonate powder on…
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