A-LevelChemistryAnalytical techniquesOct/Nov 2017Paper 3 Q214 Marks
Zinc carbonate occurs in a basic form, which means that zinc hydroxide is also present. The chemical formula of basic zinc carbonate can be written as ZnCO₃.yZn(OH)₂, where y may not be an integer. In this experiment you will heat basic zinc carbonate to decompose it and use your results to determine the value of y. When basic zinc carbonate is heated, it decomposes as shown. ZnCO₃.yZn(OH)₂(s) → (1 + y)ZnO(s) + CO₂(g) + yH₂O(g) FA 5 is basic zinc carbonate, ZnCO₃.yZn(OH)₂.
✓ Correct Answer
The correct answer is —. This question tests the candidate's understanding of analytical techniques within the Chemistrysyllabus. The examiner's mark scheme requires...
📋 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...
🔒
Unlock the Examiner's Answer
Sign up for free to reveal the correct answer, the official mark scheme breakdown, and the examiner trap analysis for this question.
Sign Up Free to Unlock →Join thousands of Cambridge students already using Oracle Prep