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CHAPTER 1 — GAS LAW [15]

By Manju · Chemistry · Grade 10 · Published Oct 28, 2026 · New

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  1. For a fixed amount of gas at constant temperature, what relationship does Boyle’s law describe?

    • a) Pressure and volume are directly proportional.
    • b) Volume and Kelvin temperature are inversely proportional.
    • c) Pressure and Kelvin temperature are inversely proportional.
    • d) Pressure and volume are inversely proportional. ✓ (correct answer)

  2. A gas occupies 500 mL at 800 mmHg. If its pressure increases by 40% of its initial pressure while the temperature remains constant, what is its new volume?

    • a) 700 mL
    • b) 375 mL
    • c) 357 mL ✓ (correct answer)
    • d) 1,000 mL

  3. How many moles of CO₂ are in a 4.4 g sample? (Molar mass of CO₂ = 44 g/mol)

    • a) 0.05 mol
    • b) 1.0 mol
    • c) 0.20 mol
    • d) 0.10 mol ✓ (correct answer)

  4. What is the empirical formula of glucose, C₆H₁₂O₆?

    • a) C₃H₆O₃
    • b) CH₂O ✓ (correct answer)
    • c) CHO
    • d) C₆H₁₂O₆

  5. Ethanol is heated with concentrated sulfuric acid at 170 °C. Which type of reaction occurs?

    • a) Esterification
    • b) Oxidation
    • c) Hydration
    • d) Dehydration ✓ (correct answer)

  6. Why is zinc generally not classified as a transition element?

    • a) Its common ion has a partially filled p subshell.
    • b) Its atom has no electrons in the outer energy level.
    • c) Its atom and common ion have completely filled d subshells. ✓ (correct answer)
    • d) Its atom has a partially filled d subshell.

  7. Chlorine water is added to potassium bromide solution. Which substance is produced as chlorine displaces bromide ions?

    • a) Fluorine
    • b) Oxygen
    • c) Bromine ✓ (correct answer)
    • d) Iodine

  8. Froth flotation is used mainly to concentrate which type of ore?

    • a) Carbonate ore
    • b) Oxide ore
    • c) Sulfide ore ✓ (correct answer)
    • d) Halide ore

  9. A reaction releases heat to its surroundings. Which statement describes the enthalpy change of the reacting system?

    • a) ΔH is positive because the reaction is exothermic.
    • b) ΔH is always positive because products form.
    • c) ΔH is negative because the reaction is exothermic. ✓ (correct answer)
    • d) ΔH is zero because heat is transferred.

  10. At constant pressure, a fixed amount of gas is cooled. According to Charles’s law, what happens to its volume?

  • a) It remains constant as its Kelvin temperature decreases.
  • b) It decreases only if the amount of gas also decreases.
  • c) It increases as its Kelvin temperature decreases.
  • d) It decreases as its Kelvin temperature decreases. ✓ (correct answer)

  1. How many representative particles are in 1.00 mol of a substance?

    • a) 3.01 × 10²³ particles
    • b) 1.00 × 10²³ particles
    • c) 1.20 × 10²⁴ particles
    • d) 6.02 × 10²³ particles ✓ (correct answer)

  2. What is the molar mass of carbon dioxide, CO₂?

    • a) 28.01 g/mol
    • b) 48.00 g/mol
    • c) 44.01 g/mol ✓ (correct answer)
    • d) 32.00 g/mol

  3. How many moles of H₂O are in 36.0 g of water?

    • a) 2.00 mol ✓ (correct answer)
    • b) 0.500 mol
    • c) 1.00 mol
    • d) 18.0 mol

  4. What is the mass of 0.500 mol of NaCl? Use 58.44 g/mol for its molar mass.

    • a) 14.6 g
    • b) 58.4 g
    • c) 29.2 g ✓ (correct answer)
    • d) 116.9 g

  5. How many molecules are in 2.00 mol of O₂?

    • a) 3.01 × 10²³ molecules
    • b) 6.02 × 10²³ molecules
    • c) 1.20 × 10²⁴ molecules ✓ (correct answer)
    • d) 2.41 × 10²⁴ molecules

  6. A sample contains 1.00 mol of helium. How many helium atoms does it contain?

    • a) 6.02 × 10²³ molecules
    • b) 1.20 × 10²⁴ atoms
    • c) 6.02 × 10²³ atoms ✓ (correct answer)
    • d) 3.01 × 10²³ atoms

  7. A sample contains 3.01 × 10²³ molecules of nitrogen gas, N₂. How many moles of N₂ does it contain?

    • a) 1.00 mol
    • b) 2.00 mol
    • c) 0.250 mol
    • d) 0.500 mol ✓ (correct answer)

  8. Approximately how many H₂O molecules are in 18.0 g of water?

    • a) 3.01 × 10²³ molecules
    • b) 1.08 × 10²⁵ molecules
    • c) 6.02 × 10²³ molecules ✓ (correct answer)
    • d) 1.20 × 10²⁴ molecules

  9. How many total atoms are present in 1.00 mol of H₂O molecules?

    • a) 3.01 × 10²⁴ atoms
    • b) 1.81 × 10²⁴ atoms ✓ (correct answer)
    • c) 6.02 × 10²³ atoms
    • d) 1.20 × 10²⁴ atoms

  10. What is the mass of 0.250 mol of CO₂? Use 44.01 g/mol for its molar mass.

  • a) 11.0 g ✓ (correct answer)
  • b) 22.0 g
  • c) 44.0 g
  • d) 5.50 g
  1. How many moles of O₂ are in 16.0 g of oxygen gas?
  • a) 0.250 mol
  • b) 1.00 mol
  • c) 2.00 mol
  • d) 0.500 mol ✓ (correct answer)
  1. Approximately how many formula units are in 0.200 mol of MgCl₂?
  • a) 6.02 × 10²² formula units
  • b) 3.01 × 10²³ formula units
  • c) 6.02 × 10²³ formula units
  • d) 1.20 × 10²³ formula units ✓ (correct answer)
  1. What is the molar mass of calcium carbonate, CaCO₃?
  • a) 56.08 g/mol
  • b) 84.01 g/mol
  • c) 100.09 g/mol ✓ (correct answer)
  • d) 116.09 g/mol
  1. How many aluminum atoms are in 0.500 mol of Al?
  • a) 1.51 × 10²³ atoms
  • b) 3.01 × 10²³ atoms ✓ (correct answer)
  • c) 6.02 × 10²³ atoms
  • d) 1.20 × 10²⁴ atoms
  1. How many hydrogen atoms are in 2.00 mol of CH₄ molecules?
  • a) 4.82 × 10²⁴ atoms ✓ (correct answer)
  • b) 6.02 × 10²⁴ atoms
  • c) 2.41 × 10²⁴ atoms
  • d) 1.20 × 10²⁴ atoms
  1. A sample contains 1.204 × 10²⁴ sodium atoms. How many moles of sodium atoms does it contain?
  • a) 4.00 mol
  • b) 2.00 mol ✓ (correct answer)
  • c) 1.00 mol
  • d) 0.500 mol
  1. What is the mass of 1.50 mol of NH₃? Use 17.03 g/mol for its molar mass.
  • a) 8.52 g
  • b) 25.5 g ✓ (correct answer)
  • c) 17.0 g
  • d) 34.1 g
  1. Approximately how many moles of aluminum are in 9.00 g of Al? Use 26.98 g/mol for its molar mass.
  • a) 3.00 mol
  • b) 0.333 mol ✓ (correct answer)
  • c) 0.167 mol
  • d) 0.500 mol
  1. Which statement correctly compares 1.00 mol of helium atoms and 1.00 mol of water molecules?
  • a) The water sample contains three times as many molecules as helium atoms.
  • b) They have the same mass because both amounts are 1.00 mol.
  • c) They contain the same number of representative particles. ✓ (correct answer)
  • d) The helium sample contains twice as many particles as the water sample.
  1. For the balanced equation 2H₂ + O₂ → 2H₂O, how many moles of H₂O can form from 3.00 mol of O₂ if H₂ is in excess?
  • a) 1.50 mol
  • b) 3.00 mol
  • c) 9.00 mol
  • d) 6.00 mol ✓ (correct answer)

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