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Edexcel IGCSE Chemistry 2.45 Sodium hydroxide tests

Practise the flame-test method, including wire choice, cleaning the wire and explaining how contamination affects the flame colour.

Syllabus
First assessment 2019
Course
Chemistry 4CH1

Exam points

  • explain that a clean platinum wire removes ions that could mask the flame colour
  • select an unreactive, high-melting-point metal wire for heating in a flame test

2.45 Flame-test method question 1

[Maximum number: 3]

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 2.45 Flame-test method question 1 — Edexcel IGCSE Chemistry

Question (a)

(a)

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

[ 3 ]

Question (i)

(i)

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

[ 1 ]

Question (ii)

(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