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UPCAT Chemistry questions with answers

13 UPCAT chemistry practice questions, each with the correct answer and a worked explanation. Drill this single topic instead of a whole subtest.

  • 6 easy
  • 5 medium
  • 2 hard
  1. 15The identity of a chemical element is determined by its number of
    Answer: D. protons    Science
  2. 16A solution with a pH of 3 is best described as
    Answer: A. acidic    Science
  3. 17What type of bond holds sodium chloride together?
    Answer: C. Ionic bond    Science
  4. 18Approximately how many particles are in one mole of a substance?
    Answer: B. 6.02 × 10²³    Science
  5. 19In the balanced equation for the formation of water from hydrogen and oxygen gas, what is the coefficient of H₂? ___ H₂ + ___ O₂ → ___ H₂O
    Answer: C. 2    Science
  6. 20Noble gases are chemically unreactive mainly because they have
    Answer: A. a complete outermost electron shell    Science
  7. 21Which of the following is a physical change?
    Answer: A. Ice melting into liquid water    Science
  8. 22Two isotopes of the same element differ in their number of
    Answer: D. neutrons    Science
  9. 23As you move down a group in the periodic table, atomic radius generally
    Answer: D. increases    Science
  10. 24What is the molar mass of CO₂? Use C = 12 g/mol and O = 16 g/mol.
    Answer: B. 44 g/mol    Science
  11. 25A catalyst speeds up a chemical reaction by
    Answer: A. lowering the activation energy required    Science
  12. 26In a solution of salt dissolved in water, water is the
    Answer: C. solvent    Science
  13. 27In a redox reaction, oxidation is defined as the
    Answer: B. loss of electrons    Science

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