Edexcel IGCSE Chemistry chemical tests

Practise chemical-test questions by matching reagents to ions or gases, recording observations and explaining clean-apparatus choices.

Exam points

Match flame-test colours, sodium hydroxide precipitates and anion reagents to ions.
Describe gas tests using splints, limewater or damp litmus and give the observation.
Explain why clean apparatus prevents contamination of flame-test or precipitate results.

Covered syllabus points

2.44 Gas tests 2.45 Flame-test method 2.46 Flame-test colours 2.47 Cation tests 2.48 Anion tests 2.49 Test for water 2.50 Water purity test

[Maximum number: 1]

A student uses this apparatus to investigate the decomposition of hydrogen peroxide solution.

Figure for Question (h) Chemical tests question 1 — Edexcel IGCSE Chemistry

This is the equation for the reaction.

2 \mathrm{H}_{2} \mathrm{O}_{2} \rightarrow 2 \mathrm{H}_{2} \mathrm{O}+\mathrm{O}_{2}

Give the test for oxygen.

[Maximum number: 6]

A student does these two tests on a solution made from a white solid.

- flame test
- add acidified silver nitrate solution

The table shows his results.

Table for Question (h) Chemical tests question 2 — Edexcel IGCSE Chemistry

(a)

Give the formula of the ion that produces the red flame.

[ 1 ]

$\mathrm{Li}^{+}$

ALLOW $\mathrm{Sr}^{2+}$

(b)

Name the cream precipitate.

[ 1 ]

(c)

Identify the white solid.

[ 1 ]

(d)

The student uses a clean metal wire in the flame test.

[ 3 ]

(i)

State why the wire should be clean when used in the flame test.

[ 1 ]

(ii)

The table lists properties of some metals.

Add ticks $(\checkmark)$ to the table to show the two properties needed in a metal wire used in a flame test.

Table for Question (ii) — Edexcel IGCSE Chemistry

[ 2 ]

All question bank results loaded

Covered syllabus points

(h) Chemical tests question 1

(h) Chemical tests question 2

Question (a)

Question (b)

Question (c)

Question (d)

Question (i)

Question (ii)