2. Guides :
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ACT - Activity
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3. BOYLE’S LAW
states that if the temperature is
constant, as the pressure of the
gas increases , the volume of a
contained gas decreases.
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4. Do you know
him ?
YES
NO
5. Robert Boyle is an English
chemist that was the first
to determine the
quantitative relationship.
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6. What is Boyle’s Law ?
• Boyle’s Law is one of the laws in physics that
concern the behaviour of gases
• When a gas is under pressure it takes up less
space:
• The higher the pressure, the smaller the volume
• Boyles Law tells us about the relationship
between the volume of a gas and its pressure
at a constant temperature
• The law states that pressure is inversely
proportional to the volume
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7. How can we write Boyle’s Law as
a formula?
• Pressure is inversely
proportional to the
volume and can be
written as:
• Pressure a 1/volume
P=pressure in N/m2
V=volume in dm3 (litres)
k=constant
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• This is more usually
written as:
• Pressure =
constant volume
• PV=k
• P1V1=P2V2
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8. Result of the experiment
Pressure p
Volume V
PxV
1
40
44
2
26
52
3
20
60
4
17
68
What can you observe from this result ?
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9. RESULT OF THE EXPERIMENT
• The pressure x volume for each set of
results remains constant
• This is called Boyle’s Law
• For a fixed mass of gas, at constant
temperature, pV = constant or
P1 x V1 = P2 x V2
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10. What can you
conclude according
to the result of the
experiment ?
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11. • Curved lines are hard to recognise, so we
plot the volume against the reciprocal of
pressure (ie. 1/p)
• This time the points lie close to a straight
line through the origin.
• This means volume is directly proportional
to 1/pressure or
• volume is inversely proportional to pressure
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12. EXAMPLE
PROBLEMS
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13. A deep sea diver is
working at a depth where
the pressure is 3.0
atmospheres. He is
breathing out air bubbles.
The volume of each air
bubble is 2 cm3. At the
surface the pressure is 1
atmosphere. What is the
volume of each bubble
when it reaches the
surface?
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14. Follow these steps so that you can
answer the problem easily :
1.) List first the given.
P1 – 3.0 atm
V1 – 2cm3
P2 – 1 atm
15. Follow these steps so that you can
answer the problem easily :
2.) Find the missing given.
V2
16. Follow these steps so that you can
answer the problem easily :
3.) Write the formula.
P1 x V1 = P2 x V2
V 2 = P1 x V 1
P2
17. Follow these steps so that you can
answer the problem easily :
4.) Solve the problem now.
V 2 = P1 x V 1
P2
V2 = 3.0 x 2
1.0
18. Follow these steps so that you can
answer the problem easily :
5.) Write the answer now.
V2 = 6cm3
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ACT
19. Answer the following questions orally.
Who is the chemist determine the quantitative
relationship between the volume and pressure
of the gasses ?
State the Boyle’s Law.
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20. ASSESSMENT
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21. Answer this problem ( 5 pts. ) and
follow the steps to solve this problem :
A balloon with a volume of 2.0 L is
filled with a gas at 3 atmospheres. If
the pressure is reduced to 0.5
atmospheres without a change in
temperature, what would be the
volume of the balloon?
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