Which of the following is a substance?
Correct answer: A. Graphite
- A. Graphite
- B. Brass
- C. Tape water
- D. Sea water
- E. Sand
Explanation
Graphite is a pure allotrope of carbon with a definite chemical composition, so it is a substance. Seawater, tap water, brass and sand are mixtures of different components.
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Chemical principles appear in acids, bases, salts, solutions, oxidation, combustion, corrosion and neutralisation, along with the composition and uses of common substances. Coverage includes soaps and detergents, fertilizers, medicines, food preservatives, polymers, fuels and water treatment, while distinguishing physical changes from chemical reactions.
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