Chemistry 0620 · IGCSE · Elements, compounds and mixtures
Elements, compounds and mixtures — practice question
The nine substances shown here are listed below.
aluminium oxide
ammonia
carbon monoxide
anhydrous cobalt(II) chloride
hydrated copper(II) sulfate
iron(III) oxide
nitrogen dioxide
silver
steel
Use these substances to answer the questions that follow. Any substance may be selected once, more than once, or not selected at all.
Name the substance that is:
(a)[1]
the principal component of hematite.
(b)[1]
a gas emitted by car engines that causes acid rain.
(c)[1]
the gas is alkaline.
(d)[1]
a chemical element.
(e)[1]
a gas produced by the incomplete combustion of fossil fuels.
(f)[1]
used to detect the presence of water.
Worked solution & mark scheme
This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: “iron(III) oxide ($\text{Fe}_2\text{O}_3$)” …