module 5(air around us)

7/30/2019 Module 5(Air Around Us)

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MODULE 5: AIR AROUND US

SECTION A

1. Figure 1 shows the component of gases in air.

Figure 1

P, Q, R and S are represented by

P Q R S

A Carbon dioxide Inert gases Oxygen Nitrogen

B Oxygen Nitrogen Carbon dioxide Inert gases

C Nitrogen Oxygen Inert gases Carbon dioxide

D Nitrogen Oxygen Carbon dioxide Inert gases

2. The information below is about the properties of gas X.

Which of the following is probably gas X?

A Carbon dioxideB HydrogenC NitrogenD Oxygen

Modul Pengayaan Sains STF (PMR)

Odourless

Dissolves in alkaline pyrogallol solution

Does not change the colour of litmus

1 %


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3 The characteristics in Table 1 below belong to a gas

Test Result

Solubility in water Soluble

Solubility in sodium hydroxide solution Very soluble

Action on a lighted splinter Extinguishes the lighted splinter

Table 1The gas is

A oxygenB nitrogenC hydrogenD carbon dioxide

4 An experiment is set up as shown in Figure 2. At the end of the experiment the limewater turn chalky.

Figure 2

What conclusion can be drawn from the experiment?

A Carbon element exists in fuelB Heat is released when fuel is burningC Soot is produced when fuel is burningD Carbon dioxide is produced when fuel is burning

5 Figure 3 below shows a set-up of apparatus

Figure 3



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A gas was collected in the test tube after a few hours. The gas was tested with a fewtests. Which of the following is true?

Test Changes

A Effect on burning splinter Extinguished with a popsound

B Effect on lime water Turns cloudyC Effect on hydrogen carbonate indicator No changes

D Effect on glowing splinter Relights

6 Figure 4 below shows two candles. Each of them is left burning in different gas jarsfilled with inhaled air and the other with exhaled air.

Figure 4

Which of the following will be observed?

A Candle Y and Z continues to burn.B Candle Y extinguishes before candle Z

C Candle Z extinguishes before candle Y.D Candle Y and Z extinguishes at the same time.

7 What are the similarities between respiration and combustion?

I Produce energyII Uses oxygenIII Occurs inside living cellsIV Produce water

A I and II only

B I, II and IV onlyC I, III and IV onlyD II, III and IV only


Inhale air Exhaled air


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8 Which of the following pair is true about pollutants and their effects?

Pollutants Effects

A Carbon monoxide Thinning of the ozone layer

B Haze Soil become acidicC Sulphur dioxide Cause breathing problem

D Oxides of nitrogen Green house effect

9 Which air pollutants is produced from combustion of fossil fuel?

A NicotineB ChlorofluorocarbonC Carbon monoxideD Nitrogen oxide

10 What is the phenomenon caused by excessive carbon dioxide in the air?

A Acid rainB Soil erosionC Green house effectD The thinning of ozone layer



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SECTION B

1. Diagram 1 shows a substance P which is allowed to burn in a gas jar containing limewater.

(a) (i) Draw what you observe at the wall of the gas jar.[ 1 mark ]

(ii) How to test the presence of the substance formed in (a) (i)

..[ 1 mark ]

(b) Write a word equation if the substance P is charcoal.

[ 2 mark ]

(c ) (i) What happen to the lime water in the gas jar ?

[ 1 mark ]

(ii) Explain your answer.

[ 1 mark ]


+ +HeatenergyOxygen +

Light

energy

Cover

Burning spoon

Air

Substance P

Lime water

Diagram11


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(d) Complete the fire triangle by putting the factors needed for combustion.

(i) P : ..

(ii) Q: ...

(iii) R : .

2. Diagram 2 shows the relationship between respiration and photosynthesis.

Diagram 2

a. Name the gases R and S

R: S: (2 marks).

b. Name a living thing that absorbs gas R.

(1 mark).

c. Name 2 living organisms that release gas S.

i ii . (2 mark)

d. Name two processes that release gas S.

. (2 mark)


R

S

Photosynthesis Respiration


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e. State two characteristics of gas R and gas S

R i:.ii:....

S i:.ii:....

( 4 marks)

3. Three sets of apparatus as shown in Diagram 3 below are set up and left aside in ahorizontal position for three hours.

Diagram 3

The result of the experiment is shown in the Table 1 below.

Test tube Observation

X Indicator moves inwards towards the boiling tubeY Indicator moves inwards towards the boiling tube

Z Indicator does not move

Table 1

a What inference can you make from the observation of the indicator?

i X: __________________________________________________________

ii Y : __________________________________________________________

ii Z: _________________________________________________________( 3 marks )

b State the function of the cotton soaked with sodium hydroxide solution.________________________________________________________________

( 1 mark )c State the conclusion from the observation of the experiment .

________________________________________________________________



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( 1 mark )


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