1. Properties and Composition of Air
4/4/17
Properties and Composition of Air
Objective: I will describe air as matter. I will graphically represent the gases in air.
PAGE 71

2. What is Air? air is a mixture of gases
atmosphere: an "envelope" around our Earth made of air
held near Earth’s surface by gravity

4. Properties of Air Air colorless, tasteless, and odorless
Air has mass and volume
Therefore, air is matter

5. Composition of the Atmosphere

6. Composition of the Atmosphere
Nitrogen (78%)
Maintained through a process called the Nitrogen Cycle
Nitrogen from the air moves to the soil, then to plants and animals, and eventually back to the air

8. Composition of the Atmosphere
Oxygen (21%)
natural processes maintain the balance of oxygen in the atmosphere
land and ocean plants create oxygen through photosynthesis
animals use oxygen during respiration

10. Composition of the Atmopshere
<1% Argon
<1% Carbon Dioxide (CO2)
most abundant compound in the atmosphere
greenhouse gas that influences global warming
Trace amounts of other gases

11. Composition of the Atmosphere

12. Air can also contain: Water vapor Ozone Particulates
gaseous form of water
Amount present in air depends on many factors (<1%-4%)
Ozone
Particulates
such as volcanic dust, soil lifted by wind, pollen, evaporated salt

13. Output Activity Page 70 Open the Purple Book to page 252
Read the section entitled “What is Air”
Answer the questions on the Lesson Review worksheet
Complete the “Skills Challenge” on the back of the paper
Make the circle graph big!
Remember to include all different categories of gases in air