Bananagirl6495 Posted April 30, 2009 Share Posted April 30, 2009 (edited) Okay so im doing a science fair project on how hot polluted water gets when its exposed to sunlight. one of pollutants is fertilizer which contains nitrates. Now someone told me that that might affect my data, if it does then why? can someone please explain in a way that a 7th grader can undestand Edited April 30, 2009 by Bananagirl6495 grammer Link to comment Share on other sites More sharing options...
hermanntrude Posted April 30, 2009 Share Posted April 30, 2009 certain chemicals when added to water can cause the water to heat up or cool down. For instance, if you add sodium hydroxide to water, the water can often boil if you add enough. Link to comment Share on other sites More sharing options...
UC Posted May 1, 2009 Share Posted May 1, 2009 Hermann has it right. They only affect the temperature when they are dissolving. Ammonium nitrate, for example, gets icy cold when you dissolve it in water. In fact, along with urea, it is used to make instant ice packs. Just make sure you let all the solutions come to room temperature before you start the tests. Link to comment Share on other sites More sharing options...
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