OCR A-Level Chemistry A (H432) · OCR H432
2 Foundations in chemistry
Written & reviewed by James Millett — Biology (Imperial College London), PGCE Science (University of Cambridge).
Practice questions on Foundations in chemistry
- Silicon dioxide (SiO₂) is used to make glass and optical fibres. It has a very high meltin… (5 marks, Explain)
- Graphite and diamond are both giant covalent structures made entirely of carbon atoms, yet… (5 marks, Explain)
- Sodium chloride is an ionic compound used to preserve food. Explain why sodium chloride ha… (5 marks, Explain)
- Buckminsterfullerene (C₆₀) is a fullerene used in medical drug delivery systems. Explain w… (5 marks, Explain)
- A bakery uses sodium hydrogencarbonate (NaHCO₃) as a raising agent in bread. A chemist ana… (5 marks, Explain)
- Magnesium oxide is an ionic compound used as a lining in furnaces that operate at very hig… (5 marks, Explain)
- Copper(II) oxide is a black solid. When excess dilute sulfuric acid is added to copper(II)… (5 marks, Explain)
- Magnesium ribbon is added to dilute hydrochloric acid. Explain the changes in oxidation st… (5 marks, Explain)
- A student wants to find the empirical formula of a compound containing only carbon and hyd… (5 marks, Describe)
- Sodium chloride is an ionic compound. Explain why sodium chloride has a high melting point… (5 marks, Explain)
- A student adds dilute hydrochloric acid to sodium hydroxide solution. Explain what type of… (5 marks, Explain)
- Water is a molecule made up of hydrogen and oxygen atoms. Explain why water is a molecule … (5 marks, Explain)
- Carbon dioxide is a simple molecular compound. Explain why carbon dioxide is described as … (5 marks, Explain)
- Methane is a simple molecular substance. Nitrogen gas also exists as a simple molecule. Ex… (5 marks, Explain)
- Iron is an element. Steel is an alloy made mostly from iron, with small amounts of carbon … (5 marks, Explain)
- A student analyses a compound containing only iron and sulfur. The student finds that 2.24… (5 marks, Explain)
- A chemist is investigating an unknown ionic compound. The compound contains only magnesium… (5 marks, Justify)
- Iron rusting is an example of an oxidation reaction. A student investigates the reaction b… (5 marks, Explain)
- A pharmaceutical company is checking the purity of a newly synthesised compound. The compo… (5 marks, Explain)
- A student investigates the reaction between zinc metal and dilute sulfuric acid. Explain w… (5 marks, Explain)
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