Title: Ice Caps on Mars vs Earth
1Ice Caps on Mars vs Earth
- aka CO2 vs H2O
- Baby its cold outside!
2Polar Ice Caps
http//imgsrc.hubblesite.org/hu/db/2005/34/images/
i/formats/large_web.jpg
3Carbon Dioxide
- Two atoms of oxygen (pictured in red) and one
atom of carbon (pictured in black) - This is a linear molecule and nonpolar
- Carbon Dioxide solid
- (CO2s or COC)
http//upload.wikimedia.org/wikipedia/commons/a/af
/Carbon-dioxide-3D-vdW.svg
4Water
- One atom of oxygen (pictured in red) and two
atoms of hydrogen (pictured in black) - Ice, Water, Water Vapor
- H2Os, l, g or H H
- O
- This is an asymmetrical molecule and polar
http//upload.wikimedia.org/wikipedia/en/0/07/Wate
r_molecule.svg
5Non-Polar vs. Polar
http//poole.stfx.ca/Members/poole/ice2.gif
6Phase Change Diagrams
32 F
32 F
Pressure at sea level
Pressure at sea level
http//hypertextbook.com/physics/thermal/pressure-
temperature/
7Air Pressure
- CO2 will phase change to liquid at about 9
atmospheres (like being 90 feet under water) - As a solid, it is -78.2 C, or -108.7 F (that is
90.2 C or 140.7 F COLDER than when water
freezes!!!
http//apollo.lsc.vsc.edu/classes/met130/notes/cha
pter1/graphics/column.free.gif
8Comets too!
- Ingredients
- Dry Ice 1½ lbÂ
- Water 2 C
- Ammonia 2 TÂ
- Corn Syrup ? t
- Dirt/Sand 3 TÂ
Photographer Matthew Bate Comet Hale-Bopp Date 9
March 1997
http//www.astro.ex.ac.uk/people/mbate/comet2.jpg
9Our Lab Today
- I will guide you through the scientific method
(inquiry investigation) - Starting with
- Playing
- Getting more info about dry ice
- Asking questions
- Predict the outcome
http//whyfiles.larc.nasa.gov/text/kids/Research_R
ack/images/scientific_method01.gif
10Our Lab Today
- Then we will
- Design our experiment
- Collect data
- Do we need to redesign?
- Analyze
- Look at your graph. Was your prediction
supported? - Communicate
----------- supported?
http//gigalock.com/sfiab/docs/20071210_Scientific
Method.png