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SPM Questions on Salts *2003 and 2004*

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                                                                                           2003 Questions

1. What are the products of the reaction between ethanoic acid and sodium carbonate?

   I      Water

   II    Ethyl ethanoate

   III  Carbon dioxide

   IV   Sodium ethanoate

   A     I and II only

   B     II and IV only

   C     I, II and III only

   D    I, III and IV only                                                                                                                                 Question 16, paper, 1 2003

2. Table below shows the volume and concentration used in titration of potassium hydroxide solution with sulphuric acid.

       What is the total volume of the mixture in the conical flask at the end point of the titration?   

      A     10 cm3

      B     20 cm3

      C     30 cm3

      D    40 cm3                                                                                                                                                 Question 42, paper 1, 2003

             

Section C, Question 4, 2003

(a) A farmer discovered that his vegetable were not growing well because the soil was poor and acidic. As a chemistry student, you

     help the farmer.

     Suggest how the farmer can overcome the problem.                                                                                                       (2 marks)

(a) Figure 7 shows an incomplete flow chart of cation and anion tests for salt X.

                                  

 

      Use the reagents listed below and complete the flow chart to confirm the salt X contains Pb2+ ions and CO32- ions. Include your 10

      obsevations. 

                                                  

                                                                                                                                                                                      (8 marks)

(c) You are required to prepare dry magnesium chloride salt. The chemicals supplied are

     Describe a laboratory experiment to prepare the salt. In your description, include the chemical equations involved.        (10 marks)

 

 

 

 

                                                                                         2004 Questions

1. Which of the following is true about acids?

   A     Acid reacts with metal to produce salt and water

   B     Acid reacts with alkali to produce salt and hydrogen gas

   C     Acid reacts with metal oxide to produce salt, water, and hydrogen gas

   D    Acid reacts with carbonate of metal to produce salt, water, and cabon dioxide gas                                    Question 4, paper 1, 2004

2. The following equation represents a neutralization reactions?

             Acid   +    Base        Salt   +   Water  

    Which pairs are reactants in neutralization reactions?

   I      Sulphuric acid   +   Sodium hydroxide

   II    Hydrochloric acid   +   Solid copper (II) oxide

   III  Sulphuric acid   +   Solid calcium carbonate

   IV   Hydrochloric acid   +   Potassium carbonate solution

   A     I and II only

   B     II and IV only

   C     II and III only

   D    III and IV only                                                                                                                                     Question 19, paper 1, 2004

 

3. Which of the following ions form a white precipitate that dissolves in excess sodium hydroxide solution?

   I      Al3+

   II    Mg2+

   III  Pb2+

   IV    Zn2+

   A     I and II only

   B     II and IV only

   C     I, II and III only

   D    I, III and IV only                                                                                                                               Question 20, paper 1, 2004

 

4. The equations shows the reaction between sulphuric acid and sodium hydroxide.

                   H2SO4   +    2NaOH       Na2SO4   +   2H2O  

    What is the volume of 1.0 mol dm-3 sodium hydroxide solution which can neutralize 25.0 cm3 of 1.0 mol dm-3 sulphuric acid?

   A     12.5 cm3

   B     25.0 cm3

   C     50.0 cm3

   D    75.0 cm3                                                                                                                                                 Question 40, paper 1, 2004

 

5. 3.2 g of copper (II)oxide powder is reacted with excess dilute nitric acid.

    What is the mass of copper (II) nitrate formed in the reaction?

    Use the information that the relative atomic mass of N = 14, O = 16 and Cu = 64.

   A     3.76 g

   B     4.96 g

   C     5.04 g

   D     7.52 g                                                                                                                                                              Question 44, paper 1, 2004

 

Section A, Question 5, 2004

Table 5  shows Experiment I and II in the preparation of a salt

 

                                                        

 

(a) State one observation in Experiment I. (1 mark)

(b) Based on Experiment II:

     (i) State the reason why copper (II) oxide powder is added in excess. (1 mark)

     (ii) State how excess copper (II) oxide powder can be separated from the products. (1 mark)

     (iii) State the chemical equation for the reaction that takes place in Experiment II. (1 mark)

     (iv) Calculate the maximum mass of the salt formed.

           Use the information that the relative atomic mass of O = 16, S = 32 and Cu = 64 (2 marks) 

(c) Experiment I is repeated. Sulphuric acid is replaced by hydrochloric acid of the same concentration. Predict the volume of

     hydrochloric acid required for a complete reaction. (1 mark)

(d) There are several steps in the preparation of the salts in each of the Experiments I and II. State one difference in the steps

     between the two experiments. (1 mark)

(e) (i) State the type of reaction in the preparation of salts in Experiment I and II. (1 mark)

     (ii) State one type of reaction in the preparation of a salt other than that in (e)(i). (1 mark)                                                                               

 

 

 

 

 

 

Check the answers with the explanations!