A solid forms when zinc reacts with oxygen. Which statement explains why this solid is a compound?
Zinc and oxygen are physically mixed
Zinc atoms are chemically combined with zinc atoms
Oxygen atoms are chemically combined with oxygen atoms
Zinc and oxygen are chemically combined
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.