CH-695
Tests for gases
Chemistry · Secondary 3 · Easy · Tests for gases
A student wants to test for the presence of carbon dioxide gas produced in an experiment. Which method should the student use?
- Bubble the gas through limewater and see if it turns milky.
- Insert a glowing splint and see if it relights.
- Hold a piece of moist red litmus paper in the gas and see if it turns blue.
- Bring a lighted splint near the gas and listen for a ‘pop’ sound.
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