A student in a Trinidad laboratory heated a sample of sugar (sucrose) strongly in a test tube. The sugar turned black and a gas was released. Which statement best explains why sugar is classified as a compound?

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Question

A student in a Trinidad laboratory heated a sample of sugar (sucrose) strongly in a test tube. The sugar turned black and a gas was released. Which statement best explains why sugar is classified as a compound?

Accepted Answer

Sugar can be broken down into simpler substances by heating — Award 1 mark for recognising that compounds can be broken down into simpler substances by chemical means (heating). C is incorrect — dissolving is a physical property shown by many mixtures. D is incorrect — elements can also exist as molecules. A is incorrect — evaporation separates mixtures, not compounds.

Answer

Sugar can be broken down into simpler substances by heating

Answer

Sugar is made up of tiny particles called molecules

Answer

Sugar dissolves easily in water to form a solution

Answer

Sugar can be separated from water by evaporation

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