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

Syllabus Edition

First teaching 2023

First exams 2025

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

Topic Questions

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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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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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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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