Elements, compounds and mixtures

The box contains the names of some substances.

dioxidewater\begin{array}{|cccc|} \hline \text{argon} & \text{carbon dioxide} & \text{copper} & \text{helium} \\ \text{magnesium} & \text{methane} & \text{sulfur dioxide} & \text{water} \\ \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 compound that is a liquid at standard room temperature and pressure?

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Which substance is a gas that turns limewater cloudy?

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Which substance is an unreactive element used to fill airships and balloons because of its low density?

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Which substance is an acidic gas that contributes significantly 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