Form 3 Chapter 6

Form 3 Science Chapter 6

FORM 3 CHAPTER 6 LAND AND ITS RESOURCES 1. Diagram 1 shows how some petroleum is heated to different temperatures. .

Thermometer

Delivery tube Petroleum Porcelain chips

Heat

Water

Petroleum fraction

Diagram 1 (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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Form 3 Science Chapter 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. Kerosene

Diesel

Petrol

Lubricating oil

.

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]

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2. Diagram 2 shows an activity to study the reaction between metal and oxygen.

Diagram 2 (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]

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Form 3 Science Chapter 6

3. Diagram 3 shows some limestone powder being heated in a boiling tube. Liquid W turns cloudy after five minutes.

Limestone powder

W

(a) (i)

Diagram 3

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. P Limestone

R Q

dissolve in water Slaked lime

Liquid W

Name (i) process P : …………………………………………………………………………………… (ii) substance Q : ……………………….……………………………………………………… (iii) process R : ………………………..………………………………………………………… [3 marks] (c) List two uses of slaked lime (i)

…………………………………………………………………………………………… ……..

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Form 3 Science Chapter 6

(ii)

…………………………………………………………………………………………… ……..

[2 marks] 4. Diagram 4 shows an activity carried out to study the effect of heat on copper sulphide.

Copper sulphide

Solution M Diagram 3

(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. Copper sulphide

+ Heat

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Form 3 Science Chapter 6

[2 marks] 5. Diagram 5 shows an activity carried out to study the property of calcium carbonate.

Dilute sulphuric acid limewater

Calcium carbonate Diagram 5 (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. Calcium carbonate

+

+

Sulphuric acid

+ [2 marks] (c) Calcium carbonate is a compound. Name the elements found in calcium carbonate. ……………………………………………………………………………………………………… [2 marks]

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(d) Which of the following can be used to replace calcium carbonate in this activity? Tick (√ ) the correct answers.

[2 marks]

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