Syllabus Edition

First teaching 2014

Last exams 2024

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Matter, Chemical Change & the Mole Concept (DP IB Chemistry: SL)

Exam Questions

2 hours47 questions
11 mark

A periodic table is needed for this question

A compound has an empirical formula of C2H6O and a molar mass of 92.16.

What is the molecular formula of this compound?

  • C2H6O 

  • C4H12O2

  • C6H18O3

  • C8H24O4

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21 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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31 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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41 mark

Which box shows a heterogeneous mixture? 

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

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    51 mark

    Ethane has the formula C2H6. What is the mass in grams of one molecule of ethane?

    (RAMs: C = 12.0; H = 1.0)

    • 1.8 x 1025

    • 3.0 x 10-23

    • 30.0

    • 5.0 x 10-23

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    61 mark

    Shown below are four molecular formulas.  Which one is also an empirical formula?

    • PCl5

    • CH3COOH

    • H2O2

    • C6H12O6

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    71 mark

    The relative atomic mass is a way of representing the mass of an atom.

    Which of the following definitions is correct for the term relative atomic mass?

    • the mass of an electron

    • 1/12 the mass of a carbon-12 atom

    • the mass of a hydrogen-1 atom

    • the mass of a proton

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    81 mark

    A periodic table is needed for this question

    Which of the following shows the relative formula mass of ammonium sulfate, (NH4)2SO4

    • 70.00

    • 132.00

    • 114.09

    • 132.17

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    91 mark

    When the following equation is balanced correctly, using the smallest whole number coefficients, which row represents the coefficients?

    __ Mg3N2 (s)  + __H2O (l) → __Mg(OH)2 (aq) + __NH3 (aq)

     

     

    Mg3N2

    H2O

    Mg(OH)2

    NH3

    A

    1

    6

    3

    2

    B

    1

    3

    3

    1

    C

    2

    6

    2

    2

    D

    2

    6

    3

    2

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      101 mark

      Which one of the following is the correct net ionic equation for the reaction between CaCl2 and AgNO3?

      • Ca2+ (aq) + 2AgNO3 (aq) → 2Ag+ (s) + Ca(NO3)2 (aq)

      • CaCl2 (aq) + 2Ag+ (aq) → 2AgCl (s) + Ca2+ (aq)

      • Ca2+ (aq) + 2NO3- (aq) → Ca(NO3)2 (aq)

      • Ag+ (aq) + Cl - (aq) → AgCl (s)

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      111 mark

      Which one of the following is the correct net ionic equation for the reaction between NaC2H3O2 (aq) and HCl (aq)?

      • C2H3O2- (aq) + HCl (aq) → CCl - (aq) + 2H2 (aq) + CO2 (aq)

      • C2H3O2- (aq) + H+ (aq) →  HC2H3O2 (aq)

      • Na+ (aq) + Cl - (aq) → NaCl (aq)

      • NaC2H3O2 (aq) + H+ (aq) → HC2H3O2(aq) + Na+ (aq)

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      121 mark

      A sample of hydrated calcium sulfate, CaSO4xH2O, has a relative formula mass of 172.19

      What is the value of x ?

      • 1

      • 2

      • 3

      • 4

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      131 mark

      Oxidation of ammonia by oxygen is the first step in the manufacture of nitric acid, which is used in the production of the synthetic material nylon.

                                              wO2(g) + xNH3(g) → yNO(g) + zH2O(g)

       Which values for w, x, y and z balance this equation?

       

       

      w

      x

      y

      z

      A

      B

      C

      D

      5

      6

      6

      5

      4

      4

      5

      6

      4

      4

      5

      6

      6

      5

      4

      4

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        11 mark

        A compound of molar mass 92 gmol-1 contains 12g of carbon, 2g of hydrogen and 32g of oxygen. What is the molecular formula of the compound?

        • CH2O2

        • CH2O

        • C2H4O2

        • C2H4O4

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        21 mark

        When lead sulfide reacts with oxygen it produces lead(II)oxide and sulfur dioxide according to the equation below:

        PbS(s)    +    O2(g)   →    PbO(s)   +  SO2(g)

        What is the whole number sum of the coefficients in the balanced equation?

        • 4

        • 5

        • 8

        • 9

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        31 mark

        A compound is made of sulfur and oxygen only. A sample of the compound has a mass of 8.0g, and consists of 3.2g of sulfur and 4.8g of oxygen. The empirical formula of the compound is:

        (RAMs  S = 32.0, O = 16.0)

        • SO

        • SO2

        • SO3

        • S2O3

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        41 mark

        Which of these processes are endothermic?

        I.  Condensing

        II. Subliming

        III. Melting

        • I and II only

        • I and III only

        • II and III only

        • I, II and III

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        51 mark

        Ethanoic acid has the formula CH3COOH. How many carbon atoms are present in
        0.1 mol of ethanoic acid?

        • 6.0 x 1022

        • 1.2 x 1023

        • 6.0 x 1023

        • 1.2 x 1024

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        61 mark

        Which of the following samples has the largest mass?

        (RAMs, H = 1.01, N = 14.01, O = 16.00)

        • 2.0 mol of NH4+

        • 1.0 mol of H2S

        • 1.0 mol of H2O2

        • 2.0 mol of OH-

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        71 mark

        A compound contains carbon and hydrogen only. The amount of carbon is 80% by mass. What is the empirical formula of the compound?

                                                     (RAMs, H = 1.01, C = 12.01)

        • CH

        • CH2

        • CH3

        • CH4

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        81 mark

        A periodic table is needed to answer this question

        A hydrated carbonate of an unknown Group 1 metal has the formula X2CO310H2O and is found to have a relative formula mass of 286.19                              

        What is the group 1 metal?

        • Rb

        • K

        • Na

        • Li

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        91 mark

        The diagram below shows the skeletal formula of phenazine.1-1-m-q9-ib-chemistry-mcqsWhat is the empirical formula of phenazine?

        • C6H6N

        • C12H8N2

        • C6H4N

        • C12H12N2

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        101 mark

        A periodic table is needed to answer this question

        A coin contains 5.869% Nickel by mass. If the coin weighs 10.00g, how many Nickel atoms are in the coin?

        • 4.30 x 1022

        • 3.01 x 1023

        • 6.02 x 1025

        • 6.02 x 1021

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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

          What is the whole number coefficient for oxygen when the equation for the combustion of pentanol is balanced?

          C5H11OH(g) + O2  → CO2(g) + H2O(g)

          • 7

          • 8

          • 15

          • 16

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          41 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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          51 mark

          What is the total number of protons and electrons in two moles of hydrogen gas?

          • 4

          • 8

          • 2.4 x 1024

          • 4.8 x 1024

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          61 mark

          Which sample contains the largest amount, in mol, of atoms?

          • 0.30 mol of P2O5

          •  0.40 mol of CuSO4.5H2O

          • 0.50 mol of CH3COOH

          • 0.90 mol of H2O

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          71 mark

          The coefficient for copper when the following equation is balanced is:

          _Cu   +  _HNO3   →  _Cu(NO3)2   + _NO   +   _H2O

          • 1

          • 2

          • 3

          • 4

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          81 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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          91 mark

          Excess dilute hydrochloric acid is added separately to equal masses of the four metals, calcium, zinc, magnesium and strontium. Which metal will give off the largest volume of hydrogen gas in the reaction?

          • calcium

          • zinc

          • magnesium

          • strontium

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          101 mark

          How many ions are present in 0.02 mol of (NH4)3PO4?

          • 8.0 x 10-2

          • 1.2 x 1022

          • 4.8 x 1022

          • 2.4 x 1023

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