Describe the test for hydrogen gas.

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Ethanol ($C_2{H}_{5}OH$) is burned in a spirit burner. The diagram below shows the experimental setup used to collect and test the products of combustion.

Draw on this

A colourless liquid collects in the U-shaped tube and the limewater in the test tube turns cloudy rapidly.

Describe a chemical test to show that the colourless liquid contains water.

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• Result:

Describe a physical test to show that the colourless liquid is pure water.

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The reaction in the test tube causes the limewater to turn cloudy quickly. Which two of the following statements are correct?

• Ethanol combustion produces carbon dioxide gas.
• Carbon dioxide from the air is the main reason the limewater turns cloudy quickly.
• The cloudiness is caused by the formation of an insoluble white precipitate of calcium carbonate.
• The cloudiness is caused by the formation of soluble calcium hydroxide.
• The reaction in the limewater represents an oxidation reaction.