A-LevelChemistryGroup 2May/June 2019Paper 2 Q37 Marks
(a) Magnesium reacts with oxygen to form magnesium oxide. State two observations that would be made when magnesium is heated strongly and placed in a gas jar of pure oxygen. [1] (b) Acid indigestion is caused by an excess of hydrochloric acid in the stomach. Magnesium oxide is commonly found in indigestion tablets. (i) Give the equation to show how magnesium oxide relieves acid indigestion. [1] (ii) Name the type of reaction that occurs in (b)(i). [1] (c) Magnesium oxide is described as a ceramic material. It has a high melting point. State and explain why ceramic materials such as magnesium oxide have high melting points. [2] (d) Magnesium oxide can be made from magnesium carbonate in a one-step reaction using heat. (i) Write an equation for this reaction. Include state symbols. [1] (ii) Name the type of reaction occurring during this process. [1] [Total: 7]
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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