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Acids

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Question 49

A student has three unknown solids, P, Q, and R.

The solids are calcium carbonate, powdered magnesium, and copper(II) oxide, but the student does not know which solid is which.

The student reacted a sample of each solid with dilute hydrochloric acid.

Table 1: Observations and gas test results

Reaction with dilute hydrochloric acidGas bubbled through limewaterGas tested with a lit splint
Solid PBubbles seen, colourless solution formedNo changeSqueaky pop
Solid QBlue-green solution formed, some black solid remains at the bottomNo gas producedNo gas produced
Solid RBubbles seen, colourless solution formedLimewater turned cloudyPuts out lit splint

Use the observations and results in Table 1 to identify which solid is which. Your answer should include:

  • How each observation or test result helps you to identify the solid
  • Word equations to support your answer.
[6]

Acids Questions

  1. GCSE
  2. /Chemistry
  3. /Acids

Practise Edexcel GCSE Chemistry Acids with exam-style questions for Foundation and Higher tier. 276 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

Question bank