Science 10 - QUARTER 4 – MATTER AND ITS INTERACTIONS
WEEK 1- BEHAVIOR OF GASES – PROPERTIES OF GASES
Introductory Message
Welcome to the Science 10 Alternative Delivery Mode (ADM) Module. In this module, you will
learn about BEHAVIOR OF GASES. It consists of activities that will enrich your understanding on
PROPERTIES OF GASES.
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acquire the needed 21st century skills while taking into consideration their needs and
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Lesson
MATTER and its Interactions
Properties of Gases
What I Need to Know
In this lesson, you will:
1. Identify the quantities use to measure gases
2. Give the equivalent values of quantities in different units
3. Express the importance of measuring instruments of different quantities
What I Know
Tell the quantities the measurements (pressure, volume, temperature)
1. 5 m3
2. 5 atm
3. 101325 Pa
4. 5 L
5. 200 K
6. 20 cm Hg
7. 1000 mL
8. 320F
9. 0o C
10. 50 torr
What’s New
CONCEPT
Gases have three characteristic properties: (1) they are easy to
compress, (2) they expand to fill their containers, and (3) they occupy far more
space than the liquids or solids from which they form.
Particles of matter in the gas phase are spaced far apart from one another and
move rapidly and collide with each other often.
· Gases are characterized by four measurable quantities . These are: (i) The volume, V,
of the gas. (ii) Its pressure, P. (iii) Its temperature, T. (iv) The amount of the gas
n (i.e., mass or number of moles).
Volume 1 mL = 1 cm3 1 L = 1 dm3 1 m3 = 1000 mL
1 atm = 760 mm Hg = 76 cm Hg = 760 torr = 101325 Pa = 14.6956
Pressure psi
Temperature 0o C = 273.15 K 00 = 320F
1. Amount of gas
2. Volume of a gas
3. Temperature
4. Pressure
Activity I
Directions: Identify the property/ies of a gas that correspond/s each situation
below.
1. A football inflated inside and then taken outdoors on a winter day
shrinks slightly.
2. A slightly underinflated rubber life raft left in bright sunlight swells up.
3. The bubbles exhaled by a scuba diver grow as the approach the
surface of the ocean.
4. Pushing in the plunger of a plugged-up syringe decreases the
volume of air trapped under the plunger.
5. A flat tire takes up less space than an inflated tire.
6. Wet air is less dense than moist air.
7. Deep sea fish die when brought to the surface.
8. A balloon filled with helium weighs much less than an identical
balloon filled with air.
9. The plunger on a turkey syringe thermometer pops out when the
turkey is done.
10. Restored roundness of dinted pingpong ball after placing into a
pan of hot water.
Activity II-Gas pressure Coversion
Example
1. Sample Problem: Pressure Unit Conversions
The atmospheric pressure in a mountainous location is measured to be 613 mmHg. What
is this pressure in atm and in kPa?
• given: 613 mmHg
• 1 atm = 760 mmHg
• 101.3 kPa = 760 mmHg
2. Example of volume conversion
Convert 2.5 L to milliliters
Solution:
From the table above we see that milli = 10 -3
1 mL = 10-3 L
Divide both sides of the equation by 10-3
1 mL ÷ 10-3 = 10-3 L ÷ 10-3
103 mL = 1 L
which we can also write as
1 L = 1,000 mL
Multiply both sides of the equation by 2.5
2.5 × 1 L = 2.5 × 1,000 mL
2.5 L = 2,500 mL (or 2.5 × 103 mL)
3. Conversion of temperature
The formula to convert Celsius to Kelvin is:
K = °C + 273
Celsius to Kelvin Problem #1
Convert 27° C to Kelvin.
Solution
K = °C + 273
K = 27 + 273
K = 300
300 K
Note that the answer is 300 K. Kelvin is not expressed in degrees. Why is
this? A scale measured in degrees indicates it references another scale (i.e., Celsius
has degrees because it's actually based on the Kelvin scale). Kelvin is an absolute
scale, with an endpoint that can't move (absolute zero). Degrees don't apply to this
type of scale.
EXERCISES : Convert the following
1. The pressure is measured to be 600 mmHg. What is this pressure in atm and in kPa?
2. Convert 5 L to milliliters
3. Convert 90° C to Kelvin.
Activity III – What is the importance of having measuring instruments of pressure,
volume, and temperature?
