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Chemistry

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Question

What colour flame is given by sodium chloride during a flame test?

answer

Red

Orange

Lilac

Question

What are compounds that contain only carbon and hydrogen atoms called?

answer

Carbohydrates

Carbohydrogens

Hydrocarbons

Question

Which is the most reactive halogen?

answer

Fluorine

Chlorine

Iodine

Question

What process is used to purify copper?

answer

Electrolysis

Filtration

Reduction in a blast furnace

Question

Why does aluminium not corrode quickly?

answer

It is an unreactive metal

It has a thin layer of aluminium oxide on its surface

It reacts with oxygen but not with water

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