Question 6
HA salt substitute is a powder that some people use instead of table salt.
A scientist uses flame emission spectroscopy to find out which metal ions are in a sample of a salt substitute.
The diagram shows the emission spectra of four metals and of the sample.
a.[2]
Identify the metal ions in the sample.
Explain your answer.
b.[1]
Give the evidence from the diagram that lithium ions are not in the sample.
c.[2]
A flame test on the sample gives a yellow flame.
Explain why flame emission spectroscopy gives better evidence than a flame test for the metal ions in this sample.
d.[2]
Give two advantages of instrumental methods of analysis.
e.[2]
The salt substitute also contains chloride ions.
Describe a chemical test for chloride ions. Give the result.
4.2 Identifying the products of chemical reactions Questions
52 exam-style questions on OCR GCSE Chemistry 4.2 Identifying the products of chemical reactions, covering 4.2.1 Tests to identify gases, 4.2.2 Tests for aqueous ions and flame tests, and 4.2.3 Instrumental methods of analysis. Each one has a worked solution and a mark scheme showing where the marks go.