OCR A-Level Chemistry B: Salters (H433) · OCR H433
2 Foundations in chemistry
Written & reviewed by James Millett — Biology (Imperial College London), PGCE Science (University of Cambridge).
Practice questions on Foundations in chemistry
- Nitrogen and hydrogen react together to form ammonia, NH₃. Explain why ammonia is a molecu… (5 marks, Explain)
- Sodium chloride is an ionic compound formed when sodium reacts with chlorine. Explain how … (5 marks, Explain)
- A food scientist is analysing an artificial sweetener to confirm its identity and purity. … (5 marks, Explain)
- A chemist is investigating a sample of a compound to determine its empirical formula. The … (5 marks, Explain)
- A student is given a white powder and is told it is either a pure substance or a mixture. … (5 marks, Explain)
- Sodium chloride is an ionic compound. Explain why solid sodium chloride does not conduct e… (5 marks, Explain)
- Fullerenes are molecules of carbon atoms with hollow shapes. One well-known fullerene is C… (5 marks, Explain)
- Graphite is used as an electrode in electrolysis experiments. Explain why graphite is able… (5 marks, Explain)
- Copper(II) oxide is a black solid. When copper(II) oxide is heated with carbon, a displace… (5 marks, Explain)
- Iron can be oxidised and reduced in different chemical reactions. In a thermite reaction, … (5 marks, Explain)
- A student tests an unknown solution using universal indicator and finds it has a pH of 2. … (5 marks, Explain)
- A student carries out an experiment in which dilute hydrochloric acid is added to solid ca… (5 marks, Explain)
- A student adds dilute sulfuric acid to a solution of sodium hydroxide. Explain what happen… (5 marks, Explain)
- A geologist discovers a mineral sample and wants to determine the empirical formula of the… (5 marks, Explain)
- A student is preparing a sample of copper sulfate crystals in a school laboratory. They di… (5 marks, Explain)
- Magnesium oxide is an ionic compound formed when magnesium burns in oxygen. Explain how ma… (5 marks, Explain)
- Calcium chloride is an ionic compound used to de-ice roads in winter. Explain how an ionic… (5 marks, Explain)
- Graphite and diamond are both giant covalent structures made entirely of carbon atoms, yet… (5 marks, Explain)
- Silicon dioxide (SiO₂) is used to make glass and has a very high melting point. Explain wh… (5 marks, Explain)
- Hydrogen and chlorine react together to form hydrogen chloride gas. Explain why hydrogen c… (5 marks, Explain)
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