1 Chemical substances, reactions and essential resources

Practice questions on Chemical substances, reactions and essential resources

• A pharmacist is checking the purity of a white powder that is supposed to be a single pain… (4 marks, Explain)
• A technician is producing a batch of sunscreen. She describes the sunscreen as a formulati… (4 marks, Explain)
• A student carries out paper chromatography on a food dye. After the experiment, the solven… (4 marks, Explain)
• A teacher heats a sample of candle wax and measures the temperature at which it melts. The… (4 marks, Explain)
• A student carries out crystallisation to obtain a sample of copper sulfate crystals from a… (4 marks, Describe)
• A student wants to find out whether a sample of aspirin tablets is pure. She measures the … (4 marks, Explain)
• A student uses simple distillation to separate ethanol from a mixture of ethanol and water… (4 marks, Explain)
• A student has two white powders, substance A and substance B. She wants to find out which … (4 marks, Explain)
• A scientist wants to find out whether a food colouring is a pure substance or a mixture of… (4 marks, Explain)
• A student carries out paper chromatography on a sample of black ink and on a pure dye call… (4 marks, Explain)
• A chemist is given two samples of a liquid. Sample A is described as pure ethanol. Sample … (4 marks, Explain)
• A student carries out paper chromatography on a sample of black ink to find out whether it… (4 marks, Explain)
• A paint manufacturer produces a green paint by mixing together two pigments, one blue and … (4 marks, Explain)
• A food colouring manufacturer claims that one of its yellow dyes is a pure substance. A ch… (4 marks, Explain)
• A food manufacturer produces a fruit drink by mixing water, sugar, and several different f… (4 marks, Explain)
• A supplier claims that a sample of water is pure. A student measures the melting point of … (4 marks, Explain)
• A student has a sample of water collected from a river. The student wants to find out whet… (4 marks, Explain)
• A student dissolves a soluble salt in water to make a solution. The student then uses crys… (4 marks, Describe)
• A student wants to obtain pure water from a salt solution. Describe how simple distillatio… (4 marks, Describe)
• A paint manufacturer produces two paints, Paint A and Paint B. Paint A is described on the… (4 marks, Explain)