1. Atmospheric Composition
No Bell Work today.

2. Success Criteria: TOC: 37. Atmospheric Composition Notes
I can identify the chemical composition of our atmosphere.
I can illustrate a mixture of gases.
TOC:
37. Atmospheric Composition Notes
Atmosphere song

3. An atmosphere is the mass of gases that surrounds a planet
Brain Pop: Earth’s Atmosphere
What is an Atmosphere?
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)
Mars
Saturn
The Moon
Jupiter
Earth

4. Remember! Our atmosphere is a MIXTURE & not a compound
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, water vapor, carbon dioxide, ozone, etc)
Nitrogen 7 N
14.0
Oxygen 8 O
16.0
Argon 18 Ar
39.9
Remember! Our atmosphere is a MIXTURE & not a compound

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

6. (View Holt Online Ch15: Sect 3 VC)
Where did Earth's atmosphere come from?
from comets and planetismals (water from space)
Venting from volcanoes
oxygen from plants
(View Holt Online Ch15: Sect 3 VC)

7. What are comets? 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.p406

8. 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. Where did Earth's atmosphere come from?
oxygen from plants
(plants absorb carbon dioxide & release oxygen)

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

11. Atmospheric Composition
SPI
Atmospheric Composition
Review 1 3 2
Oxygen
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

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

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

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

15. Exit Ticket
The table shows the percentage of individuals in a population of insects that is resistant to certain types of insecticides.
Which two populations would be most affected by a widespread use of Insecticide 2? A.
2 and 4 B.
1 and 6 C.
3 and 5 D.
4 and 6