Chemistry - Maranda High School Form 1 End Term 1 2018

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233
CHEMISTRY
MARCH 2018
2 HOURS

MARANDA HIGH SCHOOL
END TERM 1 EXAMINATION
FORM ONE

INSTRUCTIONS TO CANDIDATE

• Answer ALL questions in the spaces provided.

1. Apart from the Bunsen burner, name any three other pieces of apparatus that are used as sources of heat in the laboratory (3 Marks)
2. Name all the zones of the flame drawn below (2 Marks)
   
   
   
   
   1. Which type of flame is represented by the diagram drawn above? (1 Mark)
   2. When is it advisable to set the flame indicated above? (1 Mark)
3. Distinguish between conductors and non-conductors (2 Marks)
4. State one use of each of the following laboratory apparatus (5 marks)
   1. Separating funnel
   2. Fractionating column
   3. Crucible
   4. Deflagrating spoon
   5. Wash bottle
5. The following diagram shows parts of a Bunsen burner. State the function of the labelled parts (4 Marks)
   
   
   
   How is the part labelled X adapted to its function? (2 Marks)
6. The table below shows properties of elements X, Y and Z in their solid state. Study it and answer the question that follows:
   
   

   SOLID	SOLUBILITY IN ETHANOL	ATTRACTION BY A MAGNET
   X	insoluble	Not attracted
   Y	Insoluble	Attracted
   Z	Soluble	Not attracted

   
   Explain how a pure sample of Z can be obtained from a mixture of X and Z. (2 Marks)
7. The figure below shows the changes in temperature when a gas sample was cooled
   
   
   
   
   1. Is the gas sample pure or impure? (1 Mark)
   2. Give a reason for your answer above. (1 Mark)
   3. Name the physical process represented by region W-X (1 Mark)
   4. Identify the physical states of the sample at temperatures d and b. (1 Mark)
   5. Explain the shape of the graph at the region W-X (2 Marks)
8. Distinguish between a homogeneous mixture and heterogeneous mixture (2 Marks)
9. The following is a figure of a chromatogram with pure substances being sugar, caffeine and salt. Coke and bamboocha are mixtures. Study it and use it to answer the questions that follow.
   
   
   
   On the figure, label: (3 Marks)
   1. Solvent front
   2. Adsorbent material
   3. Base line
   4. Which of the pure substances was more soluble and less adsorbent? (1 Mark)
   5. Explain your answer above. (1 Mark)
   6. Which pure substance was not found in bamboocha? (1 Mark)
   7. Which method of separation is illustrated by the diagram shown? (1 Mark)
10. The diagram below shows a method of separating components of mixture Q
    
    
    
    
    1. What is the name of the apparatus labelled X? (1 Mark)
    2. Which type of homogeneous mixtures are separated using the method shown? (1 Mark)
    3. State one error that occurred when setting up the experiment illustrated above. (1 Mark)
    4. Name S. (1 Mark)
11. State two major differences between the properties of solids and those for gases (2 Marks)
12. Brine is made by mixing water and common salt. Give the names of the following:
    1. The solute (1 Mark)
    2. The solvent (1 Mark)
    3. The solution (1 Mark)
13.  
    1. Explain how you would obtain sand from a mixture of sand and common salt (2 Marks)
    2. Why is the method stated above unsuitable for separating a mixture of sugar and common salt? (1 Mark)
14. The table below shows the melting and boiling points of some pure substances at atmospheric pressure. Study it and answer the questions that follow.
    
    

    Substance	Melting Point	Boiling Point
    Oxygen	-219	-183
    Water	0	100
    Sodium Chloride	801	1465
    Ethanol	-117	78
    Sulphur	115	444
    Copper	1083	2600
    Propane	-188	-42

    
    
    1. Which of the substances are solids at room temperature of 22°C (1 Mark)
    2. Which of the substances are liquids at a temperature of -100°C? (1 Mark)
    3. In what physical state is copper at 1700°C? (1 Mark)
    4. Which substances are gases at 150°C (2 Marks)
    5. A sample of sodium chloride started boiling at 1600°c, what could be the reason? (1 Mark)
15. Using a well labelled diagram, distinguish between:
    1. A volumetric flask and a flat bottomed flask. (2 mks)
    2. A thistle funnel and dropping funnel (2 mks)
16. The following is a figure demonstrating a method of separation. Name the labelled parts (3 Marks)
    
    
    
    
    
17. The following is a theoretical model of matter:
    
    
    
    
    1. Name processes III and IV (2 Marks)
    2. Explain the arrangement of particles after process I has taken place (2 Marks)
    3. Explain the arrangement of particles after process IV has taken place (2 Marks)
18.  
    1. State any three social effects of drug abuse (3 Marks)
    2. State any two ways through which one can keep away from drug abuse (2 Marks)
19. Solvent extraction is used for extracting oil from nuts.
    1. What is the role of propanone in this process? (1 Mark)
    2. Why are the nuts crushed? (1 Mark)
    3. At the end of the experiment, the extract is left out in the sun for a while, why is this done? (1 Mark)
    4. A sample of the extract is smeared on a filter paper, what is the expected observation? (1 Mark)
    5. What is the significance of the observation made above? (1 Mark)
    6. State one other application of this method of extraction (1 Mark)