1 Properties of Gases
1 Properties of Gases
1 Properties of Gases
PROPERTIES OF GASES
I. Learning Objectives
At the end of the session, the students must be able to describe properties of gases.
They must be able to:
1. Characterize a gas using it properties;
2. Recognize variables that refer to pressure, volume, temperature, and amount
of gas;
3. Know the units assigned to these properties; and
4. Make conversions.
B. References
1.Department of Education, Culture and Sports. (1991). Science and
Technology III. Quezon City: Book Media Press, pp. 66,69, 77.
2.Brown, Theodore l., LeMay, H. Eugene Jr., and Bursten, Bruse E., Chemistry
the Central Science, New Jersey: Prentice Hall, 2000, pp. 353-356.
B. Materials
Plywood (at least 4ft x 4ft)
Carbon dioxide generator (vinegar and baking soda)
Rubber stopper or cork with glass tubing connected to a plastic tubing (You can
substitute empty dextrose container with its tube.)
Glass jars
Syringe
Thermometer
d. Have them push on the plywood and see who gets to move the
plywood to the other side.
b. What happened when the two groups exerted equal force? (Plywood
boundary will not move)
b. Fill a test tube with water. Cover it well and turn it upside down into the
glass jar.
c. Prepare the gas generator set-up and insert the tube. (If you are using a
dextrose container, the needle end of the tube should be inserted into the
test tube. It is advisable to remove the needle before it is brought to class.
The other end connected to the bag will be used for generating the gas.)
d. Generate carbon dioxide using the set up. (If you are using the dextrose
container, use a syringe to put the vinegar and baking soda solution into
the plastic bag. Do not remove the syringe while the reaction is underway
to decrease leaks in the system.)
e. When the gas is halfway in the test tube, remove the tube from the test
tube, being careful not to let any gas escape.
f. Using a marker pen, mark the level of the gas liquid interface.
b. How can you get the number of particles of gas? How can you relate this
to the mole concept? (number of moles= mass/ molar mass)
c. How would you measure the volume of the gas? (fill the test tube with
water up to the mark using a syringe. The volume of water added is the
also the volume of the gas.
C. Generalization
1. Gases can be described in terms of its pressure, volume, temperature, and
number of moles.
3. The number of moles is released to the mass and the volume of the gas.
4. The temperature of the gas is the same as the temperature of the liquid or solid
it is in contact with.
D. Application/ Valuing
Ask the students to interview an LPG gas dealer:
1. When you have a gas tank, how would you know if it has been properly
filled with enough gas?
E. Agreement
Bring materials for the next class.