Question 4
FA student investigates what happens when copper powder is heated in air. The figure shows the apparatus the student used. The student weighed the crucible and its contents before heating and again after heating.
Figure: The apparatus used to heat copper powder in air
a.[2]
The mass of the solid increases during the experiment. Explain why.
b.[1]
The student lifts the lid of the crucible for a few seconds every 30 seconds during the heating. Suggest why.
c.[1]
Balance the equation for the reaction.
........Cu+O2→........CuO........\text{Cu} + \text{O}_2 \rightarrow ........\text{CuO}........Cu+O2→........CuO
4.1 Reactivity of metals Questions
86 exam-style questions on AQA GCSE Chemistry 4.1 Reactivity of metals, covering 4.1.1 Metal oxides, 4.1.2 The reactivity series, 4.1.3 Extraction of metals and reduction, and 4.1.4 Oxidation and reduction in terms of electrons. Each one has a worked solution and a mark scheme showing where the marks go.