0%

DP IB Chemistry: SL

Topic Questions

Home / IB / Chemistry: SL / DP / Topic Questions / 3. Periodicity / 3.2 Oxides, Group 1 & Group 17 / Structured Questions: Paper 2


3.2 Oxides, Group 1 & Group 17

Question 1a

Marks: 2
a)
An acid base reaction occurs for the reaction between solid potassium bromide and concentrated sulfuric acid. The equation for this is:

2H2SO4 (aq) + 2KBr (s) → K2SO4 (aq) + SO2 (g) + Br2 (g) + 2H2O (l)

In this reaction redox products are also formed. List all of the redox products produced from the reaction between solid potassium bromide and concentrated sulfuric acid and give observations for any products.

[2]

    Assess your score
      

    Question 1b

    Marks: 4
    b)

    Explain why the reaction between solid potassium iodide and concentrated sulfuric acid produces hydrogen sulfide whereas the reaction between solid potassium bromide, and concentrated sulfuric acid does not. 

    [4]

      Assess your score
        
      Key Concepts
      Halogens

      Question 1c

      Marks: 2
      c)
      Hydrogen halides, H-X, are formed from the reaction of hydrogen and a halogen, X2. In solution hydrogen fluoride is classed as a weak acid, whereas HCl is classed as a strong acid. Explain this difference.
      [2]
        Assess your score
          

        Question 2a

        Marks: 1
        a)
        Describe the trends in first ionisation energy and atomic radius as you move up Group 1. 
        [1]
          Assess your score
            

          Question 2b

          Marks: 2
          b)
          Explain the connection between first ionisation energy and atomic radius seen in the alkali metals.
          [2]
            Assess your score
              

            Question 2c

            Marks: 3
            c)

            Potassium reacts with water to form hydrogen gas. Using sections 1 and 2 of the data booklet, determine the volume, in cm3, of hydrogen gas that could theoretically be produced at 273 K and 1.01105 Pa when 0.0587 g of potassium reacts with excess water.

            [3]

              Assess your score
                

              Question 3a

              Marks: 3
              a)
              Write equations for the separate reactions of lithium oxide and carbon dioxide with excess water and differentiate between the solutions formed. 


              Lithium oxide
              ................

              Carbon dioxide.............

              Differentiation..............

              [3]

                Assess your score
                  

                Question 3b

                Marks: 1
                b)
                Suggest why it is surprising that dinitrogen monoxide dissolves in water to give a neutral solution.
                [1]
                  Assess your score
                    

                  Question 3c

                  Marks: 1
                  c)

                  Calcium carbide reacts with water to form ethyne, C2H2, and one other product.

                  Estimate the pH of the resultant solution.

                  [1]

                    Assess your score
                      

                    Question 4a

                    Marks: 3
                    a)

                    Impurities cause phosphine to ignite spontaneously in the air to form an oxide of phosphorus and water.

                    The oxide formed in the reaction with air contains 56.3 % phosphorus by mass. Determine the empirical formula of the oxide, showing your method.

                    [3]

                      Assess your score
                        

                      Question 4b

                      Marks: 1
                      b)
                      The molar mass of the oxide is approximately 220 g mol−1. Determine the molecular formula of the oxide.
                      [1]
                        Assess your score
                          

                        Question 4c

                        Marks: 1
                        c)
                        State the equation for the reaction of this oxide of phosphorus with water.
                          Assess your score
                            

                          Question 4d

                          Marks: 1
                          d)
                          Predict how dissolving an oxide of phosphorus would affect the electrical conductivity of water.
                          [1]
                            Assess your score
                              
                            Key Concepts
                            Making predictions