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What is a Chemical Reaction?

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by

Danielle Peters

on 9 November 2016

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Transcript of What is a Chemical Reaction?

In order to conclude a chemical reaction has occurred a chemical change must be observed...
Observations of a Chemical Change
change in temperature
change in color
emission of gas (bubbling)
smell of odor
change in PH
dissolving reactants
forming precipitates
fire
**Must observe at least one of the above**
This means after the reaction a new substance produced...
What is a Chemical Reaction?
Chemical Reactions occur when there is change in the valence electrons.
Bonds between atoms in the reactants are broken, atoms rearrange, and form new bonds to make the products.
Only the atoms present in the reactants can end up in the products. No new atoms are created, and no atoms are destroyed.
Big Misconception
Most people think that the original substance cannot be reproduced after a chemical change.
This is NOT true!
Some chemical reactions can be reversed but another chemical reaction is needed to obtain the original substance.
Note: not all of these are examples of chemical reactions
Full transcript