Elements, compounds and mixtures Quiz
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5 questions, one answer each
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1. Which substance is a compound?
- A. Air
- B. Iron
- C. Carbon dioxide
- D. Seawater
2. Which technique separates two liquids with different boiling points?
- A. Fractional distillation
- B. Filtration
- C. Chromatography
- D. Crystallisation
3. A spot travels 2.7 cm and the solvent travels 9.0 cm. What is the Rf value?
- A. 3.3
- B. 0.33
- C. 0.60
- D. 0.30
4. Which best describes a pure substance?
- A. Anything that looks the same throughout
- B. A single element or compound with nothing else mixed in
- C. Any clear liquid
- D. A mixture with a fixed boiling point
5. A scientist wants copper sulfate crystals from its solution without heating to dryness. Which method should she use?
- A. Filtration
- B. Simple distillation
- C. Crystallisation
- D. Chromatography