Presentation for Gas LAW

1. CHEMISTRY 1- GAS LAW
JOVILYN G. FERNANDEZ

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Dear Heavenly Father, As we gather
here today, we invite Your presence
into this classroom. Lord, bless each
and every student here, as well as our
teacher, as we embark on another day
of learning. Please give us clear minds
and open hearts so we can grasp the
knowledge and lessons set before us.
PRAYER

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4. OBJECTIVE
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• DETERMINE THE RELATIONSHIP
BETWEEN TEMPERATURE, PRESSURE,
AND VOLUME USING THE FORMULA
OF GAS LAW
• SOLVE PROBLEM USING GAS LAW
FORMULA
• RELATE PRESSURE,TEMPERATURE AND
VOLUME TO OUR DAILY LIFE

5. WHAT ARE THE
PROPERTIES OF
GASES?
HIGHLY COMPRESSIBLE
THERMALLY EXPANDABLE
HIGH VISCOSITY – IT FLOWS FASTER
THAN SOLID OR LIQUID
INFINITELY MISCIBLE

6. WHAT ARE THE
CHARACTERISTICS
OF GASES?
PRESSURE
TEMPERATURE
VOLUME
AMOUNT ( MOLES )
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7. INTRODUCTION
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Do you know how to drive a bike ?
Have you experience to drive a flat
tire ? What do you observe after
pumping the flat tire?

8. PRESSURE = FORCE/AREA
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Units of Pressure :
1 pascal (Pa) – 1 N/m2
1 atm – 760mmHg =760 torr
1 atm – 101.325Pa
Problem: What is the pressure you
exert in a flat tire by pumping?
Force: 6N ; Area= 2sqm

9. VOLUME
IS THE AMOUNT OF
SPACE AN OBJECTS
TAKES UP.
LITERS –IS THE
VOLUME UNIT FOR
LIQUIDS AND GASES
CUBIC METER IS THE
UNIT FOR SOLID
(LXWXH)
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10. TEMPERATUR
E
IS THE HOTNESS AND
COLDNESS EXPRESSED
IN CELSIUS ,
FAHRENHEIT .
IT ALSO INDICATES
THE AREA OF HEAT
TRANSFER .
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11. AVOGADRO’S
NUMBER
VO LUME O F A G AS IS DIRECT LY
PROPORTIONAL TO THE NUMBER
O F MO LES ( O R NUMBER O F
PART ICLES) O F G AS WHEN T HE
T EMPERAT URE AND PRESSURE
ARE HELD CO NSTANT.
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12. IDEAL GAS LAW
I D E A L G A S L AW F O R M U L A :
P V = N RT T H E G E N E R AL G AS E Q U AT I O N , I S
T H E E Q U AT I O N O F A H Y P O T H E T I C A L I D E A L G A S . I T I S A
G O O D A P P R O X I M AT I O N O F T H E B E H AV I O R O F
M A N Y G A S E S U N D E R M A N Y C O N D I T I O N S
W H E R E :
P - P R E S S U R E ; V – V O L U M E ;
N – N U M B E R O F M O L E S ,
R - I D E A L G A S C O N S TA N T ;
T – T E M P E R AT U R E
AT S TA N D A R D T E M P E R AT U R E
P R E S S U R E : 1 0 1 . 3 2 5 K PA
V O L U M E : 2 2 . 4 1 4 L
T E M P E R AT U R E : 2 7 3 . 1 5 K
R = P V N T = 1 0 1 . 3 2 5 K PA × 2 2 . 4 1 4 L 1 . 0 0 0 M O L × 2 7 3 . 1 5 K
= 8 . 3 1 4 K PA ⋅ L / K ⋅ M O L
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13. BOYLE’S LAW
IS A G AS L AW T HAT T HE PRESSURE
AND VO LUME O F A G AS HAVE AN
INVERSE RELAT IO NSHIP. IF VO LUME
INCREASES, T HEN PRESSURE
DECREASES
( P1VI =P2V2 )
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Problem: A 2.5L containing has a gas pressure of
4.6atm. If the volume decreased to 1.6L .What
will be the new pressure ?

14. CHARLE’S LAW
C O N S TA N T P R E S S U R E ; T H E V O L U M E
O F G A S E S I N C R E A S E S W H E N T H E
T E M P E R AT U R E R I S E S A N D
D E C R E A S E S W H E N T H E
T E M P E R AT U R E D E C R E A S E S
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A given amount of oxygen gas has a volume of
25.0L at a temperature of 37degC and a pressure of
1.0 atm .At what temperature would this gas occupy
a volume of 22.0L at a pressure of 1.0atm ?

15. GAY LUSSAC’S
LAW
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At 20°C a confined ammonia gas has a
pressure of 2.50 atm. At what temperature
would its pressure be equal to 760 mmHg
1atm -760mmHG ;
K= C+ 273.15.

16. ACTIVITY
GROUP THE STUDENT INTO
THREE .EACH GROUP WILL BE
GIVEN THE SAME PROBLEM
REL ATED TO BOYLE’S L AW ,
CHARLE'S L AW AND GAY
LOUSSAC’S L AW . THE FIRST
ONE WHO CAN SOLVE AND
GIVE THE CORRECT ANSWER
WILL BE THE WINNER .
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1. The pressure of a gas is 2.30 atm in a 1.80 L container.
Calculate the final pressure of the gas if the volume is
decreased to 1.20 liters.
2.The volume of a gas decreased from 2.40 L to 830. mL
and the final temperature is set at 40.0 °C. Assuming a
constant pressure, calculate the initial temperature of
the gas in kelvins.
1 Celcius = 274.15K

17. SHORT QUIZ
1. The volume of a given amount of gas is inversely proportional to its pressure at constant
temperature is stated by what law?
a. Avogadro’s Law b. Gay-Lussac Law c. Charles’s Law d. Boyle's Law
2. When volume on a gas goes up what happens to its pressure?
a. stays the same b . rises. goes down c. rises, then falls
3. Which of the following refers to the statement of Charles’ Law?
a. The relationship of volume and pressure of a gas is inversely proportional.
b. The relationship of volume and pressure of a gas is directly proportional.
c. The relationship of temperature and volume of a gas is directly proportional.
d. The relationship of temperature and volume of a gas is inversely proportional.
4. When the volume goes down what happens to its temperature?
a. rises b. goes down c. goes up d. rises, then falls
5. Which of the following gas laws describes the relationship of volume and moles?
a. Boyle’s Law b. Charles`s Law c. Avogadro’s Law d. Ideal Gas Law

18. ASSIGNMENT
AT 300 K, THE GIVEN AMOUNT OF
FLUORINE GAS HAS A VOLUME OF
30.0 L. WHAT WILL BE THE
TEMPERATURE IF THE GAS
OCCUPIES A VOLUME OF 25 L AT
CONSTANT PRESSURE?
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19. THANK YOU