第 1 题
1 分In the reactivity series, where are the non-metals hydrogen and carbon often placed to help predict displacement reactions?
AQA GCSE · Combined Science- Trilogy 8464
Chemical changes：练习题
5 道选择题即时批改，另有 1 道文字题附完整解题步骤，全部围绕「Chemical changes」。
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第 2 题
1 分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?
第 3 题
1 分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?
第 4 题
1 分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?
第 5 题
1 分When an aqueous solution of sodium chloride is electrolysed using inert electrodes, what are the products formed at the cathode and the anode?
第 6 题
2 分Identify the color a strong acid turns universal indicator and state its approximate pH value.
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