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

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

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

Composition of the Atmosphere

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

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

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

Composition of the Atmosphere

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

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