1 Chemical substances, reactions and essential resources

Practice questions on Chemical substances, reactions and essential resources

• A technician is testing a sample of a yellow paint pigment to check whether it is a pure s… (4 marks, Explain)
• A student is given two white powder samples. One is pure aspirin and the other is an aspir… (4 marks, Explain)
• A food scientist is checking the purity of a sample of vanilla flavouring before it is use… (4 marks, Explain)
• A pharmaceutical company produces two batches of a painkiller. Batch 1 is described as a p… (4 marks, Explain)
• A student has a mixture of two liquids, ethanol and water. Explain how fractional distilla… (4 marks, Explain)
• Crystallisation can be used to obtain a pure salt from a solution. Describe the steps invo… (4 marks, Describe)
• Paper chromatography can be used to separate the pigments in a food colouring. A student r… (4 marks, Explain)
• A food colouring manufacturer claims that one of its red dyes is a pure substance. A techn… (4 marks, Explain)
• A pharmacist is checking the purity of a painkiller tablet. She dissolves a small amount o… (4 marks, Explain)
• A pharmacist describes a painkiller tablet as a formulation. Explain what is meant by the … (4 marks, Explain)
• A student wants to find out whether a sample of a white solid is a pure substance or a mix… (4 marks, Describe)
• A student carries out crystallisation to obtain a pure sample of copper sulfate from a sol… (4 marks, Describe)
• A student uses paper chromatography to separate the dyes in two fruit drinks, labelled P a… (4 marks, Explain)
• A student carries out paper chromatography on a sample of black ink and finds that three s… (4 marks, Explain)
• A manufacturer produces a sunscreen lotion and claims it is a formulation. Explain what is… (4 marks, Explain)
• A student carries out paper chromatography on two black inks, Ink A and Ink B, using the s… (4 marks, Explain)
• A student wants to find out whether a sample of aspirin tablets is pure. She measures the … (4 marks, Explain)
• A student tests two white solid substances, substance A and substance B, to find out which… (4 marks, Explain)
• A student wants to obtain a sample of pure water from a salt solution. Describe how simple… (4 marks, Describe and Explain)
• A student separates a mixture of liquids using simple distillation. Describe how simple di… (4 marks, Describe)