Cambridge IGCSE Combined Science practice
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At a glance
3
Paper
2
Marks
Topic
Identification of ions and gases
Exam-style question
Testing for gases in a chemistry experiment.
Description
You need to identify carbon dioxide and oxygen in a lab. Explain the tests you would perform for each gas.
Explain the test for carbon dioxide using limewater.
Aim for approximately 2 distinct marking points.
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Flashcard 1 of 6
Question 1 of 5
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Description
You are provided with several gases: ammonia, carbon dioxide, chlorine, hydrogen, and oxygen. Describe how you would identify each gas using appropriate tests.
Describe the method to identify ammonia using damp red litmus paper.
Aim for approximately 2 distinct marking points.