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DP IB Chemistry: SL

Topic Questions

Home / IB / Chemistry: SL / DP / Topic Questions / 1. Stoichiometric Relationships / 1.1 Matter, Chemical Change & the Mole Concept / Structured Questions: Paper 2


1.1 Matter, Chemical Change & the Mole Concept

Question 1a

Marks: 2
a)
Nitroglycerin is an oily, colourless liquid and a high explosive, discovered by Alfred Nobel. The unbalanced equation for its explosive decomposition is given below. 

........C3H5N3O9 (l)  .......N2 (g) +   ......CO (g) + .......H2O (g) + .......O2 (g)

Deduce the coefficients required to balance the equation for this reaction and use the equation to suggest why nitroglycerin acts as a high explosive.
[2]
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    Key Concepts
    Balancing Equations

    Question 1b

    Marks: 4
    b)
    Nitroglycerin is also used medicinally to treat angina attacks. It comes in the form of tablets, ointments, skin patches and nasal sprays. Nasal sprays vaporise the nitroglycerin, so it is quickly absorbed in the body.

    A commercial 11.2 g nasal spray pump delivers a metered dose of exactly 400 micrograms of nitroglycerin. Determine the number of moles present in one dose and how many doses a spray pump can deliver.
    [4]
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      Question 1c

      Marks: 1
      c)
      Suggest a reason why the actual number of doses delivered by the spray pump is less than you have calculated in (b).
      [1]
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        Question 1d

        Marks: 1
        d)
        Describe the changes of state and the energy changes that take place when the spray pump is used.
        [1]
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          Key Concepts
          State Changes

          Question 2a

          Marks: 3
          a)
          Carvone is an organic compound containing carbon hydrogen and oxygen.
          Complete combustion of 0.1526 g carvone produces 0.4470 g of carbon dioxide and 0.1281 g of water. Determine the empirical formula of carvone, showing your working.
          [3]
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            Question 2b

            Marks: 2
            b)
            0.146 g sample of carvone, when vaporised, had a volume of 0.0341 dm3 at 150 oC and 100.2 kPa. Calculate its molar mass showing your working.
            [2]
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              Question 2c

              Marks: 2
              c)
              Using your answer to part b), determine the number of molecules of carvone in 0.146 g.
              [2]
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                Question 3a

                Marks: 2
                a)
                Calculate the number of atoms of nitrogen in 38.46 g of ammonium sulfate?
                [2]
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                  Question 3b

                  Marks: 2
                  b)
                  Deduce the number of protons in 38.46 g of ammonium sulfate.
                  [2]
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                    Question 3c

                    Marks: 1
                    c)
                    Using Section 4 of the Data booklet, calculate the mass, in g, of protons in 38.46 g of ammonium sulfate.
                    [1]
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                      Key Concepts
                      Relative Mass
                      The Mole

                      Question 4a

                      Marks: 1
                      a)
                      The coca cola company states that a 12 oz can of coke contains 34 mg of caffeine, M = 194.19 g mol-1. Calculate the number of moles of caffeine in a can of coke.
                      [1]
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                        Question 4b

                        Marks: 4
                        b)
                        The composition by mass of caffeine is 49.48%  carbon, 5.20% hydrogen, 28.85% nitrogen and the rest is oxygen. Calculate the empirical formula of caffeine.
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                          Question 4c

                          Marks: 1
                          c)
                          Calculate the molecular formula of caffeine using your answer from part b).
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                            Question 4d

                            Marks: 2
                            d)
                            State the type of mixture coca cola is.
                            Does this change after the can of coke is opened? Justify your answer.
                            [2]
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                              Key Concepts
                              Mixtures

                              Question 5a

                              Marks: 1
                              a)
                              Concentrated nitric acid can be made to react with sulfur, and will produce sulfuric acid, nitrogen dioxide and water as the only products. Write a balanced equation for the reaction.
                              [1]
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                                Key Concepts
                                Balancing Equations

                                Question 5b

                                Marks: 2
                                b)
                                Deduce the redox changes taking place in the reaction in part a). 
                                [2]
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                                  Question 5c

                                  Marks: 2
                                  c)
                                  Examine the state changes in the reaction in part a) and suggest the relative difference in the energy content of the products and reactants.
                                  [2]
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                                    Key Concepts
                                    State Changes

                                    Question 5d

                                    Marks: 4
                                    d)
                                    Identify the ions in part a) and calculate the sum of the relative formula masses of all the ions in reaction equation, using section 6 of the Data booklet.
                                    [4]
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                                      Key Concepts
                                      Relative Mass