Your SlideShare is downloading. ×
The effect of carbon dioxide on the environment
Upcoming SlideShare
Loading in...5

Thanks for flagging this SlideShare!

Oops! An error has occurred.


Saving this for later?

Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime - even offline.

Text the download link to your phone

Standard text messaging rates apply

The effect of carbon dioxide on the environment


Published on

7th grade

7th grade

Published in: Technology

  • Be the first to comment

  • Be the first to like this

No Downloads
Total Views
On Slideshare
From Embeds
Number of Embeds
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

No notes for slide


  • 1. Effect of Carbon Dioxide on the Environment DSVS – Spring 2011 7 th Grade
  • 2. I. Introduction
    • Explain to students that in today’s experiment they will be studying what happens when carbon dioxide is bubbled into drinking water, rain water, and ocean water.
    • Tell them that air contains a small amount of carbon dioxide gas (about 0.03%).
    • Ask them the question: Where do they think the carbon dioxide in air comes from?
  • 3. II. Demonstration
    • Pour the contents of the bottle labeled rain water into the first glass.
    • Pour the contents of the bottle labeled drinking water into the second glass.
    • Pour the contents of the bottle labeled ocean water into the third glass.
    • Hold the cups up so that the students can see them and have them describe them.
  • 4. II. Demonstration (Cont.)
    • Scientists can use indicators to test if something is acidic, basic, or neutral.
    • Write the Bromothymol blue color chart on the board.
    • Add a few drops of the Bromothymol blue indicator to the each of the waters (until you get a good color in each one) and show the students the color changes.
  • 5. III. Experiment
    • NOTE: DSVS members need to put on a pair of gloves when distributing pieces of Dry Ice to the students.
    • Tell students that today's activity involves some reactions of carbon dioxide in water.
    • Since Dry Ice is at -78 o C, tell the students not to handle the Dry Ice.
  • 6. IIIA. Effect of bubbling carbon dioxide into “ocean” water
    • Give each group a plate, a 6 oz clear cup 1/3 filled with “ocean water”.
      • Tell students to describe the liquid. It is clear.
      • Tell the students this is not real ocean water, but is pure water with chemicals added to it to make it similar to ocean water.
    • DSVS members should add a squirt of bromothymol blue indicator to each pair’s cup, so that the color is deep blue.
    • One DSVS member puts a piece of Dry Ice into each cup of the water/indicator mixture.
    • Tell the students to watch for any changes and record observations.
  • 7. IIIB. How is carbon dioxide removed from the air?
    • By photosynthesis in plants
    • Removal can also occur when carbon dioxide dissolves in water. Rainwater can naturally dissolve CO 2 . This makes the rainwater naturally slightly acidic.
    • Water in the oceans can also remove CO 2 directly from the air. The oceans contain 50 times more CO 2 than that found in the atmosphere.
    • These natural mechanisms can remove 10 billion tons of CO 2 per year.
  • 8. IV. Discussion
    • Ask students if they can think of consequences of dissolving increasing amount of carbon dioxide in ocean waters?
    • It will make the oceans more acidic.
    • The change in acidity so far is small, but greater changes are expected.
    • Acidification could adversely affect marine life, but scientists are not sure how great the affect will be.
  • 9. Cleanup
    • All the cups can be emptied into a sink and washed down with water.
    • If there is no sink, empty the contents back into the “ocean water” bottles and return to the lab. Make sure the cap is on tightly.
    • Put all used cups in the trash bag and return with the kit.
    Credit: Vanderbilt Students Volunteer for Science