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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 • 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
