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

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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) …………………………………………………………………………………………………..

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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