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Greenhouse effect science project

Posted: Fri Jan 24, 2014 4:11 pm
by Jrr
My daughter is doing a science fair project on the greenhouse effect. We are using two air sealed jars with the same amount of soil in both but in one we are adding dry ice to use for carbon dioxide and place under a lamp. I was wondering how much dry ice will need to be added. Thanks

Re: Greenhouse effect science project

Posted: Fri Jan 24, 2014 6:33 pm
by scibuddyAK
Hi there!

Interesting project idea!

Just one thing to note is that, in my opinion, IF you're doing an experiment, I would have the light and carbon dioxide set up under different conditions so you can measure the effects of each one individually (and possibly together) on the jars. Otherwise, if it's a demonstration-type project, this sounds like a great setup!

I'm not sure about dry ice - in my experience, I've always added CO2 through other mechanisms for slightly different purposes. However, I believe that if you research some climate change statistics, you could probably find (in ppm: parts per million) the amount of CO2 in regular vs. global warming conditions, or some information like that. That may help you decide how much dry ice to put - perhaps correlating the ppm in air to the amount in dry ice could help, while this may be difficult. Another consideration I have is that dry ice is probably difficult to measure and a bit risky to hand for an elementary school student. That being said, I'd say to try looking into alternatives if you have the time/resources - I remember I used a pump when I tried to add CO2 in a jar with algae, although I don't know if that's the best way to do it.

I hope some other Experts can chime in here to help further. I'm sorry if this didn't fully answer your question - hope this helps, though!

Thanks!

Re: Greenhouse effect science project

Posted: Thu Feb 06, 2014 3:41 pm
by dpututor
Hello!
A possible way to create CO2 involves the reaction between water, baking soda and lemon juice. Below is a link to an experiment where CO2 is produced and inflates a balloon. You could store the CO2 you made in the balloon until you need to transfer it into the jar showing the CO2 effects.
http://www.sciencekids.co.nz/experiment ... loons.html

I hope this works!
Lily