Exercise Air Pressure Without Scheme

7/31/2019 Exercise Air Pressure Without Scheme

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CHAPTER 6 AIR PRESSURE

J O M S C O R E S C I E N C E M O D U L E Page 1

Gas particles

Piston

Enclosed container

Force

Movement of gas particleWall of a container

Exercise 6.1

1. The diagram below shows the random movement of gas particles and their collisions with

the wall of a container.

Complete the statement below to explain what air pressure is with reference to the

Kinetic Theory.

Air pressure is the force exerted when _____________collides with

the of a container.

2. The diagrams below show two apparatus A and B that is used to show the factors that

affects air pressure.

(A) (B)


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Higher air pressure region Lower air pressure region

Gas particleAir flow

Underlinethe correct answers below to explain how the two factors affect air pressure.

a. In apparatus A, when the temperature of air in an enclosed container is increased, the

air pressure inside the glass flask will (increase / decrease).

b. In apparatus B, when the volume of air in an enclosed container is decreased, the air

pressure inside will (increased / decreased).

3. The diagram below shows that air will flow from a higher air pressure region to a region of

lower air pressure.

a) Tick (/) the correct appliance that uses the principle of air pressure based on the

information above.

b) Underline the correct answer in the statement below to explain how the correct

appliance in 1(a) works after the piston is pushed.

When the volume of air inside the appliance is (increased / decreased), air pressure

increases

A B


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4. In the diagram, a man is not able to suck water from the glass because there is a hole in the

drinking straw.

Suggest one way to enable him to suck the water up the drinking straw?

______________________________________________________________________

5. The diagram below shows two highly pressurized gas containers.

Tick (/) in the correct box below for the correct safety measure and (X) if wrong.

6. Diagram 1 shows an experiment related to air pressure.

Diagram 1

(a) What would happen to the balloon?

______________________________________________________________________

A B


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(b) Explain your answer.

______________________________________________________________________

(c) Name two factors that affect the air pressure.

i. ___________________________________________________________________ii. ___________________________________________________________________

7. Diagram 2 shows a rubber sucker sticking onto the mirror.

Diagram 2

(a) Why does the sucker stick onto the mirror?

______________________________________________________________________

______________________________________________________________________

(b) What is the easiest way to separate the sucker from the mirror?______________________________________________________________________

(c) Give your reason for your answer in (b) above.

______________________________________________________________________

______________________________________________________________________

(d) Give four examples of devices that apply the concept of air pressure in their operation.

i. ___________________________________________________________________

ii. ___________________________________________________________________

iii. ___________________________________________________________________

iv. ___________________________________________________________________


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8. Ismail has conducted a simple experiment as shown in Diagram 3.

Diagram 3

The table below shows the result of this experiment.

Plastic bag Time taken (in seconds) to fill the 100 ml beaker

With one hole 38

With 2 holes 20

With 4 holes 20

(a) State the following variables :i. Manipulated variable : _________________________________________________

ii. Responding variable : _________________________________________________

iii. Constant variable : _________________________________________________

(b) Explain why the water in Experiment B flows out faster than Experiment A.

______________________________________________________________________

______________________________________________________________________

(c) What would happen if cooking oil is used instead of water?

______________________________________________________________________

(d) Based on the air pressure concept, write your conclusion for this experiment.

______________________________________________________________________


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9. In an experiment, a glass full of water is covered with a piece of cardboard.

(a) What would happen to the water if the glass and the cardboard are carefully

overturned?

___________________________________________________________________

(b) Explain your answer above.

___________________________________________________________________

___________________________________________________________________

(c) What do you learn from the above experiment?

___________________________________________________________________

(d) Water is boiled in a metal can and steam is allowed to escape. Then, the can is

closed tightly and sunk into a basin of iced water.

i. In your opinion what would happen to the can?________________________________________________________________

ii. Explain your answer above.

________________________________________________________________

iii. Give two factors that influence the air pressure.

________________________________________________________________

iv. At sea level, the air creates 10N force on every 1cm3 area. How much air

pressure is exerted on the 150cm3 surface area?

________________________________________________________________


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10. Diagram 4 shows an apparatus to show that temperature affects air pressure.

Diagram 4

(a) What is the function of the pressure gauge?

______________________________________________________________________

(b) What happens to the air pressure in the glass flask when the water is heated?

______________________________________________________________________

(c) Based on your observation, what is the relationship between the temperature and air

pressure.

______________________________________________________________________

(d) Choose two devices from the box below which use the principle of air pressure tooperate.

i. ___________________________________________________________________

ii. ___________________________________________________________________

(e) Besides temperature, state one other factor that affects air pressure.

______________________________________________________________________

Electric kettle Syphon Rice cooker Rubber sucker


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11. The diagram shows devices using the principal of air pressure.

(a) What is the function of the device labeled S.

______________________________________________________________________

(b) i. What happens when air is sucked out of the drinking straw?

________________________________________________________________

ii. Give one reason for your answer in b (i).

________________________________________________________________

(c) What happens when there is a hole on the drinking straw?

______________________________________________________________________

(d) Name two other devices that use the principle of air pressure.

i. ________________________________________________________________

ii. ________________________________________________________________

12. Diagram 5 shows a set up of apparatus to investigate air pressure.


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(a) i. State a reason for boiling the water in P.

________________________________________________________________

ii. State one observation in R.

________________________________________________________________

iii. Explain your answer in (a)(ii).

________________________________________________________________

iv. What is the conclusion for this activity?

________________________________________________________________

(b) Diagram 5.2 shows a person drinking from a packet of juice. The packet collapses.

i. What step can you take to change K to its original shape?

________________________________________________________________

ii. Draw particles in the boxes given to show the changes that has occurred in J and

K.

J K

Diagram 5.2


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13. Diagram 6.1.1 shows a dented pingpong ball is immersed in hot water.

(a) i. Draw you observation after five minutes in Diagram 6.1.2.

ii. Explain you answer in (a)(i).

___________________________________________________________________

(b) List the factors that influence air pressure

i. ___________________________________________________________________

ii. ___________________________________________________________________


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14. Diagram 7 shows a syringe.

Diagram 7

(a) What will happens to the air pressure in the syringe as the piston is pushed downwards?

______________________________________________________________________

(b) What can be done to make a dented pingpong ball round again?

______________________________________________________________________

(c) What can be concluded about the factors affecting air pressure from activities carried out

in (a) and (b).

______________________________________________________________________

(d) The following Diagram 8 shows milk being poured out of a tin.

Diagram 8

i. Explain why the milk does not flow out from the tin.

___________________________________________________________________

ii. What could be done to make the milk floe easily out of the tin?

___________________________________________________________________


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15. Diagram 9 shows a device that applied the principle of air pressure.

Diagram 9

(a) i. Name the device shown in Diagram 9.

___________________________________________________________________

ii. State the uses of the device in Diagram 9.___________________________________________________________________

(b) i. What will happen to the air pressure in the cylinder, when the piston pushedinwards?

___________________________________________________________________

ii. State one inference for the answer in (b) (i).___________________________________________________________________

(c) What will happen to the air pressure at P, when the piston is pushed inwards?______________________________________________________________________

(d) Based on Diagram 9, what will happen if there is a hole at point Q?______________________________________________________________________

P

Q


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16. Diagram 10 shows an activity to study the air pressure. In the activity, a dented ping-pongball was placed in hot water.

Diagram 10

(a) i. What happen to the dented ping-pong ball after a few minutes?

___________________________________________________________________

ii. Give one reason for your observation in (a) (i).___________________________________________________________________

(b) i. What happens to the air pressure in the ping-pong ball when it is heated?___________________________________________________________________

ii. Draw the movement of particles in the ping-pong ball at the end of the experiment inthe diagram below.

(c) i. What will happen if the hikers bring gas cylinder up to a mountain?___________________________________________________________________

ii. Give you reason for your answer in (c)(i).___________________________________________________________________


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17. Diagram 11 shows a suction pump.

Diagram 11

(a) What is the function of a suction pump?

____________________________________________________________________

(b) What happens when the pumps is pressured onto the surface of sink as shown in

Diagram 11?

____________________________________________________________________

(c) What makes the suction pump to be attached strongly onto the surface of the sink

after the step in (b)?

____________________________________________________________________

(d) What happens when the pump is pulled upwards after the step in (c)?____________________________________________________________________

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Exercise Air Pressure Without Scheme