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Form 3 ScienceChapter 6
FORM 3 CHAPTER 6LAND AND ITS RESOURCES
1. Diagram 1 shows how some petroleum is heated to different temperatures.
.
(a) Name the process used in Diagram 1 to obtain the petroleum fractions
………………………………………………………………………………………………………
[1 mark]
(b) Table 5.2 shows the four fractions of petroleum collected in four separate test tubes according to different temperature.
Distilled oil Range of boiling point Colour
P 30-800C Colourless
Q 80-1200C Yellow
R 120-1600C Orange
S 160-2000C Red
Table 5.2
169
Diagram 1
Thermometer
Delivery tube
Porcelain chips
Petroleum
Water Petroleum fraction
Heat
Form 3 ScienceChapter 6
(i) What is the relationship between P and S in terms of their boiling points and the colour of the distillate?
…………………………………………………………………………………………………….
[1 mark]
(ii) Using the words given below, name fractions P, Q, R and S..
P: …………………………………………..
Q: …………………………………………..
R: ………………………………………….
S: …………………………………………..
[2 marks]
(c) (i) State one use of P.
……………………………………………………………………………………………………
[1 mark]
(ii) Explain why we have to use P wisely.
……………………………………………………………………………………………………
……………………………………………………………………………………………………
[1 mark]
Kerosene Diesel Petrol Lubricating oil
170
Form 3 ScienceChapter 6
2. Diagram 2 shows an activity to study the reaction between metal and oxygen.
(a) What is the function of the potassium permanganate crystals?
……………………………………………………………………………………………………..
[1 mark]
(b) Between zinc and copper, which metal is more reactive towards oxygen?
………………………………………………………………………………………………………
[1 mark]
(c) Name the product formed when zinc reacts with oxygen.
……………………………………………………………………………………………………..
[1 mark]
(d) Write the word equation for the reaction between copper and oxygen.
[2 marks]
(e) Give one reason why metals such as gold and silver do not react with oxygen.
………………………………………………………………………………………………………
[1 mark]
171
Diagram 2
+
Form 3 ScienceChapter 6
3. Diagram 3 shows some limestone powder being heated in a boiling tube. Liquid W turns cloudy after five minutes.
(a) (i) What is liquid W?
………………………………………………………………………………………………….
(ii) Why does it turn cloudy?
…………………………………………………………………………………………………..[2 marks]
(b) Liquid W can be produced from limestone by the processes shown below.
Name
(i) process P : ……………………………………………………………………………………
(ii) substance Q : ……………………….………………………………………………………
(iii) process R : ………………………..…………………………………………………………
[3 marks]
(c) List two uses of slaked lime
(i) …………………………………………………………………………………………………..
(ii) …………………………………………………………………………………………………..
172
Limestone powder
W
Diagram 3
Limestone Q Slaked lime Liquid WP R dissolve in water
Form 3 ScienceChapter 6
[2 marks]4. Diagram 4 shows an activity carried out to study the effect of heat on copper sulphide.
(a) What is solution M?
…………………………………………………………………………………………………
[1 mark]
(b)(i) What happen to solution M when the copper sulphide is heated strongly?
……………………………………………………………………………………………….
[1 mark]
(ii) Name the gas released that causes the change in solution M b (i).
……………………………………………………………………………………………….
[1 mark]
(c) Name the product left in the test tube after the copper sulphide was heated strongly.
………………………………………………………………………………………………….
[1 mark]
(d) Complete the word equation for the above reaction.
[2 marks]
173
Copper sulphide
Solution M
Diagram 3
+Copper sulphide Heat
Form 3 ScienceChapter 6
5. Diagram 5 shows an activity carried out to study the property of calcium carbonate.
(a)(i) What happens to the limewater?
……………………………………………………………………………………………………
[1 mark]
(ii) Name the gas that is produced.
…………………………………………………………………………………………………..
[1 mark]
(b) Complete the equation to show the reaction in Diagram 5.
[2 marks]
(c) Calcium carbonate is a compound. Name the elements found in calcium carbonate.
………………………………………………………………………………………………………
[2 marks]
174
Calcium carbonate limewater
Dilute sulphuric acid
Diagram 5
Calcium carbonate + Sulphuric acid +
+
Form 3 ScienceChapter 6
(d) Which of the following can be used to replace calcium carbonate in this activity?Tick (√ ) the correct answers.
[2 marks]
175