S1.1 Introduction to the particulate nature of matter Quiz
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5 questions, one answer each
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1. Which of these is a compound?
- A. Air
- B. Brass
- C. Carbon dioxide
- D. Oxygen
2. What is 100 °C in kelvin?
- A. 173 K
- B. 273 K
- C. 373 K
- D. 100 K
3. A sample of gas is heated from 200 K to 400 K. What happens to the average kinetic energy of its particles?
- A. It halves
- B. It stays the same
- C. It doubles
- D. It quadruples
4. Which equation shows correct state symbols for dissolving sodium chloride in water?
- A. NaCl(s) → Na⁺(aq) + Cl⁻(aq)
- B. NaCl(aq) → Na⁺(l) + Cl⁻(l)
- C. NaCl(l) → Na⁺(aq) + Cl⁻(aq)
- D. NaCl(s) → Na(s) + Cl(g)
5. Which statement explains why a mixture can be separated by physical methods?
- A. Its components are in a fixed ratio
- B. Its components are not chemically bonded to each other
- C. It has a sharp melting point
- D. It contains only one type of atom