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Earth's Atmospheric Composition: Gases and Mixture

This presentation explains the chemical makeup of Earth's atmosphere, highlighting the mixture of gases present and the importance of trace gases. Discover how the atmosphere came to be and how it has changed over time.

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Earth's Atmospheric Composition: Gases and Mixture

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  1. SPI 0807.9.5 Atmospheric Composition Notes Science Tennessee SPI Objective: Describe the chemical makeup of the atmosphere. Instructions for Students 1) Make sure you view this presentation in slideshow mode. 2) You can find instructions about how to do this by doing a Google search or by searching YouTube. 3) After you have it in slideshow mode, press the right-arrow keyboard button to advance through the presentation. 4) If you need help, please communicate with your teacher. Check for Understanding Explain how the chemical makeup of the atmosphere illustrates a mixture of gases. Essential Question(s) 1) What is the chemical composition of our atmosphere? 2) What evidence demonstrates that our atmosphere is a mixture and not a compund?

  2. SPI 0807.9.5 Atmospheric Composition Notes Science What is an Atmosphere? • An atmosphere is the mass of gasesthat surrounds a planet. • and is held in place by gravity. • Planetary atmospheres are common in our solar system • (Even the Moon has a very thin atmosphere.) Saturn Mars Jupiter Earth The Moon

  3. SPI 0807.9.5 Atmospheric Composition Notes Science Earth's Atmosphere Earth’s atmosphere is a mixture of various gases Earth's Current Atmosphere …(approx) 78% nitrogen …(approx) 21% oxygen …(approx) 1% other gases (Argon, etc) (argon, water vapor, carbon dioxide, etc) 7 8 N 18 O Ar Nitrogen Oxygen 14.0 Argon 16.0 39.9 Remember! Our atmosphere is a MIXTURE & not a compound

  4. SPI 0807.9.5 Atmospheric Composition Notes Science Earth's Current Atmosphere …displayed with pie charts/circle graphs …(approx) 78% nitrogen …(approx) 21% oxygen …(approx) 1% other gases (Argon etc.) 7 8 N 18 O Ar Nitrogen Oxygen 14.0 Argon 16.0 39.9

  5. SPI 0807.9.5 Atmospheric Composition Notes Science Earth's Current Atmosphere …approx) 1% other gases (Argon etc.) What are the “other” gases? Note: They are called Trace Gases Neon (Ne) Argon (Ar) Helium (He) Carbon Dioxide (CO2) Methane (CH4) Water Vapor (H2O) …and any other odor, pleasant or unpleasant, that you have ever smelled.

  6. SPI 0807.9.5 Atmospheric Composition Notes Science • Where did Earth's atmosphere come from? • from comets and planetismals • Venting from volcanoes • oxygen from plants • (View Holt Online Ch15: Sect 3 VC)

  7. SPI 0807.9.5 Atmospheric Composition Notes Science • Where did Earth's atmosphere come from? • from comets and planetismals (water from space) What are comets? Comets are giant "dirty snowballs" in space. They consist of frozen water, stellar dust, and rocky debris.

  8. SPI 0807.9.5 Atmospheric Composition Notes Science • Where did Earth's atmosphere come from? • Venting from volcanoes • 3 most common gases from volcanoes • (1) Water Vapor, (2) Carbon Dioxide, and (3) Sulfur Dioxide

  9. SPI 0807.9.5 Atmospheric Composition Notes Science • Where did Earth's atmosphere come from? • oxygen from plants-photosynthesis • (plants absorb carbon dioxide and release oxygen)

  10. Earth's Changing Atmosphere Millions of year’s ago, Earth’s atmosphere was mostly carbon dioxide, water vapor, and ammonia. What changed it? Plants converted the carbon dioxide to oxygen , and this oxygen broke down the ammonia into nitrogen.

  11. SPI 0807.9.5 Atmospheric Composition Review Science 1 3 2 Oxygen Section number two in the circle graph above BEST represents the percentage of…? A) Carbon B) Oxygen C) Argon D) Nitrogen

  12. In diagram 01 below, which gas is represented in the Portion labeled 1 on the pie chart? A) Argon B) Nitrogen C) Hydrogen D) Oxygen Nitrogen Diagram 02 Diagram 01

  13. SPI 0807.9.5 Atmospheric Composition Science Questions

  14. SPI 0807.9.5 Atmospheric Composition Science Questions

  15. Argon and various trace gases make up about 1% of Earth’s atmosphere. SPI 0807.9.5 Atmospheric Composition Science Questions Neon Argon Helium Carbon Dioxide Methane Water Vapor

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