Atmosphere Quarter 3 2014. Unit Topics of Study Properties of Gases and the Air we Breathe Gas...

AtmosphereQuarter 3

2014

Unit Topics of Study

Properties of Gases and the Air we Breathe

Gas Laws and the Air we

BreatheGas Laws and EquilibriumAir Pollution, Climate Control, & Combustion Reactions

Weather

Properties of Gases and the Air we Breathe

• Main Ideas (in no order):

– Atmospheric Pressure– Volume– Temperature– Kinetic Molecular

Theory– Composition of Air

• How will we do it:– Notes– Labs and Activities– Worksheets– Practice Problems

and Questions

Comparing State of Gas to other known States of Matter

What observations can you make?

Properties of Gases

1. Gases have mass – find mass of empty balloon and filled balloon

2. It is easy to compress gases – squeezed gas reduces its volume; car air bags

3. Gases fill their containers completely – 4. Different gases can move through each other quite

rapidly – diffusion (body spray, body gas, etc)5. Gases exert pressure – ear drums “popping”, filled

balloon6. The pressure of a gas depends on its temperature -

↑ temp = ↑ pressure; ↓ temp = ↓ pressure

Gases in the Atmosphere

• What gases are in the atmosphere?

• How do the gases behave when there are changes in temperature? Volume? Pressure?

• How does radiation from sun affect those gases?

Hint: Refer to these answers when completing the extra credit

exosphere—contains few particles that move into and from space.

thermosphere—temperature increases with height. The temperatures can rise to 1,500 degrees Celsius, but it would not feel warm because of the low air pressure in this layer.

The International Space Station orbits Earth in this layer.

mesopause—boundary between mesosphere and thermosphere; coldest place on Earth.

mesosphere—the layer in which most meteors burn up after entering Earth’s atmosphere and before reaching Earth’s surface.

stratosphere—contains the ozone layer; the layer where volcanic gases can affect the climate

troposphere—layer closest to Earth’s surface; all weather occurs

What gases are in the atmosphere?

Carbon Dioxide

“The Pressure’s On”Classtime

read assignmentbrain storm & jot down points you want to

include (Pre-Writing Activity)mind map those pointswrite essay

Studyhall/homecomplete essaycheck for spelling/grammar

“Exploring Properties of Gases”Lab Activity

Lab Activity Procedures for Each Station: Reread the procedure Review your prediction Perform the experiment Record your observations Restore the station to its original condition

When all stations completed, answer the questions

Lab Activity Review1. Which experiments are useful in

demonstrating that air is matter? Explain.2. Which experiments are useful in

demonstrating that air exerts pressure? Explain.

3. Explain any differences between your predictions and the actual outcomes of the experiments.

Review cont.

4. For any two of the stations at which you performed experiments, a. Describe your observations in detailb. Explain the role of air in the experimentc. Draw particle models showing the interactions between the gas particles in air and the other particles of matter in the experiment

Review cont.

5. Describe an additional activity or experience you have had that demonstrates that a. Air is matterb. Air exerts pressure

6. Home activity (or café): put one end of a straw in a glass of water. Hold another straw outside the glass. Place the ends of both straws in your mouth and try to drink the water through the straw in the glass.

a. Describe what happensb. Based on your observations, what makes it

possible to drink liquid through a straw?

The Nature of Gases

• Book pg 419 bolded