Browse all quizzes
ChemistryGrade 12English

IB DP Chemistry HL Paper 1 Sample 2023

This paper tests your ability to think like a chemist under pressure — spotting periodicities, balancing equations, and choosing the right relationship between data in seconds. You'll encounter questions on stoichiometry, atomic structure, and bonding that mirror the real IB HL Paper 1 style: short, sharp, and designed to reward fluency. Inside are three focused topics covering fundamental calculations and trends that underpin everything else in HL chemistry. Aimed at Grade 12 students preparing for the IB DP Chemistry examination, this sample gives you authentic multiple-choice and calculation tasks. By completing this paper, you'll internalize the shortcuts examiners expect and stop second-guessing yourself on mark-scheme wording.

14 questions · play in your browser
No signup required — try it for free.

Questions in this quiz

Answers hidden — play to find out.

  1. Question 1

    A sample of calcium carbonate (CaCO₃) has a mass of 5.00 g. How many moles of CaCO₃ are present? (Ar values: Ca = 40, C = 12, O = 16)

  2. Question 2

    The electron configuration of chlorine (atomic number 17) is:

  3. Question 3

    What is the empirical formula of a compound containing 40% carbon, 6.7% hydrogen, and 53.3% oxygen by mass? (Ar: C = 12, H = 1, O = 16)

  4. Question 4

    Which element has the highest first ionization energy in Period 3?

  5. Question 5

    The electronegativity difference between hydrogen and oxygen is approximately 1.4. The O–H bond in water is best described as:

  6. Question 6

    True or False: The second ionization energy of magnesium is always greater than the second ionization energy of sodium.

  7. Question 7

    When 25.0 cm³ of 2.00 mol/dm³ hydrochloric acid reacts with excess sodium hydroxide solution, the heat released is 5.74 kJ. Calculate the enthalpy change for the reaction per mole of HCl.

  8. Question 8

    A reaction is spontaneous at high temperatures but non-spontaneous at low temperatures. Which statement about ΔG\Delta G, ΔH\Delta H, and ΔS\Delta S is correct?

  9. Question 9

    The equilibrium constant expression for the reaction 2NO2(g)⇌N2O4(g)2\text{NO}_2(g) \rightleftharpoons \text{N}_2\text{O}_4(g) is:

  10. Question 10

    At equilibrium in a closed system, the forward and reverse reaction rates are equal. True or False?

  11. Question 11

    Which of the following transitions in a hydrogen atom would emit light with the longest wavelength?

  12. Question 12

    A 0.100 mol sample of a metal M reacts with excess oxygen to form an oxide M2_2O3_3. The mass of the oxide produced is 15.2 g. What is the identity of metal M? (Ar: O = 16; select from options below)

  13. Question 13

    The bond enthalpy of a C–C single bond is approximately 348 kJ/mol, and the bond enthalpy of a C=C double bond is approximately 612 kJ/mol. Which statement is correct?

  14. Question 14

    If the pressure on an equilibrium system is increased, the equilibrium will shift toward the side with: