MINISTRY OF EDUCATION AND HUMAN RESOURCES, TERTIARY EDUCATION AND SCIENTIFIC RESEARCH MAURITIUS EXAMINATIONS SYNDICATE. CHEMISTRY OCTOBER hour

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1 MINISTRY OF EDUCATION AND HUMAN RESOURCES, TERTIARY EDUCATION AND SCIENTIFIC RESEARCH MAURITIUS EXAMINATIONS SYNDICATE CANDIDATE NAME SCHOOL NAME CLASS/SECTION NATIONAL ASSESSMENT AT FORM III CHEMISTRY OCTOBER hour Students answer on the Question Paper. READ THE FOLLOWING INSTRUCTIONS CAREFULLY FIRST Write your name, the name of your school and your class/section in the spaces provided above. Write in dark blue or black ink. You may use a soft pencil for any diagrams, graphs or rough working. Any rough working should be done in this booklet. Do not use correction fluid. There are 6 questions in this paper. Check that this document consists of 8 printed pages. Any discrepancy in the document must be immediately notified to the responsible officer in your school. Answer all questions. The number of marks is given in brackets [ ] for each question or part question. The total of the marks for this paper is 50.

2 Question 1 - Multiple Choice (6 marks) For each item, there is only one correct answer. Draw a circle around the letter which shows the correct answer. (a) Which of the following shows a chemical change? A Dissolving salt in water. B Mixing sand and sugar in equal proportions. C Burning a piece of wood in air. D Mixing water and oil. (b) A few drops of water fall on a spot of ink on a piece of paper. A pattern of colours is formed on the paper. This is due to the process of A distillation. C precipitation. B chromatography. D neutralisation. (c) A test tube is clamped as shown in figure 1 (a). It contains substances X, Y and Z which are all solid powders. Y Test tube Clamp Magnet X, Y and Z Stand X and Z figure 1 (a) figure 1 (b) Figure 1 (b) shows the effect of bringing a strong magnet near the test tube and slowly moving it upward. The test tube is gently tapped with a pencil. One conclusion you may draw from this observation is A X and Y are magnetic substances. C only Y is a magnetic substance. B X and Z are magnetic substances. D X, Y and Z are all magnetic substances. 2

3 (d) One example of an air pollutant is A B C D water vapour. neon. sulphur dioxide. magnesium oxide. (e) Which one of the following will produce a displacement reaction when mixed? A B C D Iron powder and a solution of magnesium sulfate. Magnesium powder and a solution of iron sulfate. Copper powder and a solution of magnesium sulfate. Zinc powder and a solution of magnesium sulfate. (f) To test for the presence of oxygen gas we use A B C D a lighted splinter. lime water. litmus solution. a glowing splinter. 3 Please turn over this page

4 Question 2 (9 marks) Table 1 shows the formulae of some compounds of calcium, ammonium and aluminium. (a) Study and complete Table 1 below. Some examples have been done for you. Table 1: Three compounds of calcium, ammonium and aluminium Chloride Oxide Carbonate Calcium Calcium chloride compound compound compound CaCl 2 Ammonium Ammonium chloride compound Ammonium carbonate compound NH 4 Cl (NH 4 ) 2 CO 3 Aluminium Aluminium chloride compound compound AlCl 3 [6] (b) Fill in the blanks using the name of the appropriate compound from Table 1. Eg. Calcium chloride is soluble in water. sublimes when it is heated gently. [1] (ii) Coral contains the compound. [1] (iii) is the ore of a metal. [1] 4

5 Question 3 (8 marks) (a) A small piece of clean magnesium ribbon is placed in 2 cm 3 of dilute sulfuric acid. The acid is used in excess. What will you observe when the magnesium ribbon is added to the acid? (ii) Give one reason why this reaction stops after some time. (b) One clean and new iron nail is placed in a beaker containing some water. Describe the appearance of the iron nail before it is placed in the water water Iron nail (ii) Describe the appearance of the iron nail after 2 months. (iii) Explain what has happened: (c) Some physical changes in the water cycle are shown as processes A and B below. Water in rivers process A Water vapour in air process B Water in clouds Name each process. Process A is [1] Process B is [1] (ii) During which process is heat energy absorbed? 5 Please turn over this page

6 Question 4 (9 marks) In a science laboratory, a group of students observe the following four solid substances: (1) copper (3) hydrated copper (II) sulfate (2) copper (II) oxide (4) anhydrous copper (II) sulfate Complete the following: (a) Which of the four substances is an element? [1] (b) State the colour of each of the substances below: copper (II) oxide (ii) hydrated copper (II) sulfate [1 + 1] (c) Which one of the following compounds is insoluble in water? (1) copper (II) oxide, (2) hydrated copper (II) sulfate, (3) anhydrous copper (II) sulfate. (d) To prepare a solution of hydrated copper (II) sulfate, we can use copper (II) oxide and [1] (ii) Which type of reaction occurs in (d)? [1] (e) How can we obtain anhydrous copper (II) sulfate from hydrated copper (II) sulfate? (f) Which of the substances in (e) above can be used as a test for the presence of water? (ii) Describe the change when a drop of water is added to the substance you mentioned in f above. 6

7 Question 5 (9 marks) A test tube contains an equal amount of each of two lead salts in solid state. About 10 cm 3 of pure distilled water is added to the salts. The mixture is then well shaken and separated. The different stages of this experiment are shown in a sequence in figure 2. STAGE 1 STAGE 2 STAGE 3 P.. add 10 cm 3 water Mix Two lead salts -- Clear colourless solution figure 2: Test with two lead salts L Less solid remains F Solid L Clamp Stand Small beaker Clear colourless solution Complete the following: (a) What conclusion can you draw about the two lead salts at stage 2? (b) In stage 3, label P and F on the diagram. [2] (c) Given that the salts used may be carbonate, chloride, sulfate or nitrate of lead, Solid L may be [1] (ii) The solution in the small beaker may contain the salt [1] (d) The sequence in figure 2 shows two processes in the separation of solids. These are and [2] (e) Name a process that can be used to separate the following substances: Compounds in natural petroleum oil: [1] (ii) Sodium chloride from sea water: [1] 7 Please turn over this page

8 Question 6 (9 marks) (a) Most of the energy that we use in Mauritius comes from the combustion of fossil fuels, such as heavy oil and petrol. For instance, we use petrol to power our vehicles. Which gases are produced during the combustion of fossil fuels in an excess of air? and [2] (ii) When fossil fuels are burnt in the absence of sufficient oxygen, a toxic compound is formed as a gas. Give the name of this compound and its chemical formula. Name: and Formula: [2] (b) Air is a mixture of gases. Name the main gas present in air. [1] (ii) Which gas in air condenses easily? [1] (c) The composition of air in our environment is maintained by natural processes carried out by living things. One of these processes is respiration. Name the other process. [1] (ii) Explain how these two processes balance the composition of air. [2] End of Question Paper. 8

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