Skip to content

Course home

4.1 Acids

4.1 Acids

EasyMediumHard
1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768
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]
Markscheme

4.1 Acids Questions

  1. GCSE
  2. /Chemistry
  3. /4.1 Acids

276 exam-style questions on Edexcel GCSE Chemistry 4.1 Acids, covering 4.1.1 Acids, alkalis and the pH scale, 4.1.2 Hydrogen ion concentration and pH, 4.1.3 Dilute and concentrated, weak and strong acids, 4.1.4 Bases, alkalis and the reactions of acids, 4.1.5 Chemical tests for hydrogen and carbon dioxide, 4.1.6 Neutralisation as a reaction of acids with bases, 4.1.7 Preparing soluble salts, and 4.1.8 Solubility rules and preparing insoluble salts. Each one has a worked solution and a mark scheme showing where the marks go.

Question bank