Notes Science Essential Question(s) What is the chemical composition of our atmosphere, and how does this illustrate a mixture of gases? Tennessee SPI Objective: Describe the chemical makeup of the atmosphere. Check for Understanding Explain how the chemical makeup of the atmosphere illustrates a mixture of gases. SPI Atmospheric Composition

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

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

Earth's Current Atmosphere …(approx) 78% nitrogen …(approx) 21% oxygen …(approx) 1% other gases (argon, water vapor, carbon dioxide, ozone, etc) SPI Atmospheric Composition Notes Science Nitrogen 7 N 14.0 Oxygen 8 O 16.0 Argon 18 Ar 39.9

Where did Earth's atmosphere come from?  from comets and planetismals  Venting from volcanoes  oxygen from plants Notes SPI Atmospheric Composition Science

Where did Earth's atmosphere come from?  from comets and planetismals (water from space) Notes SPI Atmospheric Composition Science What are comets? Comets are giant "dirty snowballs" in space. They consist of frozen water, stellar dust, and rocky debris.p406

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 Notes SPI Atmospheric Composition Science

Where did Earth's atmosphere come from?  oxygen from plants (plants absorb carbon dioxide & release oxygen) Notes SPI Atmospheric Composition Science

Has Earth's atmosphere ever changed? Notes SPI Atmospheric Composition Science Earth’s first atmosphere was mostly carbon dioxide, water vapor, & ammonia Yes it has! What changed it? Plants converted the carbon dioxide to oxygen, and this oxygen broke down the ammonia into nitrogen.

For the Earth’s atmosphere, section number two in the pie Graph above BEST represents the percentage of…? A) Carbon B) Oxygen C) Argon D) Nitrogen SPI Atmospheric Composition Review Oxygen Science

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 Review Diagram 01 Diagram 02 SPI Atmospheric Composition Nitrogen Science

Here is an example of a question you might see on a quiz or test. Questions Science Atmospheric Composition-Question SPI Atmospheric Composition

Here is an example of a question you might see on a quiz or test. Questions Science Atmospheric Composition-Question SPI Atmospheric Composition

Here is an example of a question you might see on a quiz or test. Questions Science Atmospheric Composition-Question SPI Atmospheric Composition