Elements, compounds and mixtures

The box contains the names of some chemical substances.

chloride\begin{array}{|cccc|} \hline \text{aluminium} & \text{ammonia} & \text{ethanol} & \text{hydrogen} \\ \text{iron} & \text{neon} & \text{nitrogen dioxide} & \text{sodium chloride} \\ \hline \end{array}

Choose a substance from the box that best matches each description. Each substance may be used once, more than once or not at all.

Which substance is a covalent compound that is a liquid at standard room temperature and pressure?

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Which substance is an alkaline gas that turns damp red litmus paper blue?

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Which substance is an unreactive element that glows with a bright red-orange light when an electric current passes through it?

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Which substance is a brown, toxic acidic gas that contributes to acid rain?

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Which substance is a metal that can be extracted from its oxide by heating with carbon?

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Elements, compounds and mixtures Questions