Question 10
FFirework makers add metal compounds to fireworks to give coloured flames.
A scientist uses flame emission spectroscopy to analyse a powder from a firework.
The diagram shows the emission spectra of five metals and of the powder.
a.[2]
Which metals are in the powder?
b.[2]
The label on the firework says:
"Red colour from lithium compounds."
Do the results support the label? Explain your answer.
c.[2]
A worker does a flame test on the powder. The flame is yellow-orange.
Explain why the flame test is not useful for identifying the metals in this powder.
d.[2]
Give two advantages of using flame emission spectroscopy to analyse the powder.
e.[2]
The worker says:
"The powder has two lines for copper but only one line for sodium. This shows that there is more copper than sodium in the powder."
Evaluate the worker's statement.
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.