Reactions

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Reactions

Postby NiceGirl761 » Sun Feb 17, 2013 2:28 pm

How can you test to see whether a reaction has happened and what to look for?
NiceGirl761
 
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Project Question: Investigating Reactivity of Plastics with Commonly Consumed Beverages
Project Due Date: 3/2/13
Project Status: I am just starting

Re: Reactions

Postby Goldenzenith » Sun Feb 17, 2013 5:49 pm

Hello, NiceGirl761,

It depends on what is being reacted. If, say, you predict a gas will be formed, you might see bubbles. Other evidence of reactions having occurred include color changes, new/different odors (although I wouldn't go sniffing around for any; if you want to check this, you'll have to waft the odor over with your hand), and the formation of precipitates (solids). Specific examples follow:

A solution of diamminesilver(I) chloride is reacted with dilute nitric acid. Silver chloride results as a precipitate, which could be predicted because it's the driving force of the reaction.

Aluminum metal reacts with a solution of copper(II) chloride. There are many ways to tell a reaction has happened (or should have, anyway) for this particular example. For one thing, the metal dissolves while the solution's temperature increases. Also, a red precipitate forms and the solution goes from blue to clear.

Hopefully this has addressed your question! If you have any further questions, feel free to ask! :)
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Enjoy! :D
-RM, Expert
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Re: Reactions

Postby NiceGirl761 » Mon Feb 18, 2013 12:58 pm

Thanks! You helped a lot.
NiceGirl761
 
Posts: 18
Joined: Sat Feb 16, 2013 2:56 pm
Occupation: Student: 9th grade
Project Question: Investigating Reactivity of Plastics with Commonly Consumed Beverages
Project Due Date: 3/2/13
Project Status: I am just starting

Re: Reactions

Postby Goldenzenith » Sun Feb 24, 2013 6:17 pm

You're very welcome! :)
Need an idea or some inspiration?
http://www.sciencebuddies.org/science-fair-projects/project_ideas.shtml

Want to read up on awesome projects and science/math-related news?
http://www.sciencebuddies.org/blog/index.php

Enjoy! :D
-RM, Expert
Goldenzenith
Expert
 
Posts: 117
Joined: Sun Sep 11, 2011 6:14 am
Occupation: Student: 12th grade
Project Question: n/a
Project Due Date: n/a
Project Status: Not applicable


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