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IBChemistryHLExam QuestionsModels of the Particulate Nature of MatterIntroduction to the Particulate Nature of Matter

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First teaching 2023

First exams 2025

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Introduction to the Particulate Nature of Matter (HL IB Chemistry)

Exam Questions

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Introduction to the Particulate Nature of Matter

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Introduction to the Particulate Nature of Matter

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11 mark

Which equation below represents deposition?

  • 2Al(s) + 3Br2(g)  →  2AlBr3(s)

  • MgCO3(s) + 2HCl(aq)  →  MgCl2(aq) + CO2(g) + H2O(l)

  • I2(g)  →  I2(s)

  • HgCl2(s)  →  HgCl2(g)

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21 mark

Below are three statements about mixtures. Which of them are correct?

I    Mixtures can contain elements and compounds.

II   The components of a mixture must be in the same state.

III The components of a mixture keep their own properties.

  • I and II only

  • I and III only

  • II and III only

  • I, II and III

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31 mark

Which box shows a heterogeneous mixture? 

1-1-ib-chemistry-mcq-q4-easy

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    4a2 marks

    Name the six changes of state, and state which changes are accompanied by a decrease in particle separation distances.

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    4b1 mark

    State the difference between a homogeneous and a heterogeneous mixture.

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    4c3 marks

    Classify the following mixtures as homogeneous or heterogeneous: crude oil, concrete and brass.

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    4d1 mark

    Which technique would be the most suitable for the separation of crude oil?

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    11 mark

    Which equation does not represent sublimation or deposition?

    • NH3 (g) + HCl (g) → NH4Cl (s)

    • I2 (s) → I2 (g)

    • C16H10O (s) → C16H10O (g) 

    • H2O (g) → H2O (s)

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    21 mark

    Which of the following is a heterogeneous mixture?

    • An aqueous solution of copper(II) chloride

    • An alloy of iron, carbon and chromium

    • A mixture of sulfur and potassium chloride 

    • A mixture of ammonia, hydrogen sulfide and methane gases

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    31 mark

    Which statement is correct about recrystallisation when purifying a solid?

    • The solid must be insoluble in the hot solvent

    • The impurities will remain in the solvent when cooled

    • The yield of product is the same after recrystallisation 

    • The solvent is in excess during recrystallisation

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    11 mark

    The correct combination relating to state change, particles and energy is:

    A

    Subliming

    particles move further apart

    particles gain energy

    B

    Vaporizing

    particles come closer together

    particles gain energy

    C

    Melting

    particles move further apart

    particles lose energy

    D

    Condensing

    particles come closer together

    particles gain energy

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      21 mark

      Which of the following mixtures is NOT classified as homogeneous?

      • Salt solution

      • Brass

      • Orange juice that has been filtered

      • Concrete

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      31 mark

      The order in which oxygen, methane, nitrogen and argon will diffuse from slowest to fastest, at the same conditions of temperature and pressure is:

      • O2 ﹤ N2 ﹤ Ar ﹤ CH4

      • CH4 ﹤ Ar ﹤ N2 ﹤ O2

      • N2 ﹤ O2 ﹤ Ar ﹤ CH4

      • Ar ﹤ O2 ﹤ N2 ﹤ CH4

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      41 mark

      Chlorofluorocarbons have been used extensively as liquid coolants in refrigerators and air conditioners. Which of the following descriptions explains how a refrigerant works?

      • At high pressure the liquid evaporates and absorbs heat, cooling the surroundings

      • At low pressure the liquid evaporates and absorbs heat, cooling the surroundings

      • At high pressure the liquid condenses and absorbs heat, cooling the surroundings

      • At low pressure the liquid condenses and absorbs heat, cooling the surrounding

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