what is a chemical reaction? a process that changes one set of chemicals into another some bonds...
Post on 24-Dec-2015
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What is a chemical reaction? A process that changes one set of chemicals
into another Some bonds are broken and new bonds are
formed http://www.youtube.com/watch?v=4N0m95PEx
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Chemical Reactions
Some release energy
Gets hot Ex: the foam experiment
Some use energy Gets cold Ex: instant ice pack
Some reactions are fast Some reactions are slow
Chemical reactions and energy
Our bodies need them to happen inside of us
to survive. (so do all living things)
Why should we care about chemical reactions??
Chemical reaction in the lungs
A chemical reaction allows you to get rid of carbon dioxide from your blood so you can breathe it out.
Chemicals in your saliva help you to start breaking down starch in your food.
Chemical reaction in your mouth!
Chemical
reactions in your stomach help you to break down food to get energy
Chemical reactions in your stomach
In order to stay alive, organisms need energy
to carry out reactions inside of them. The amount of energy needed to get a
chemical reaction started is called “activation energy” Ex: lighting paper on fire.
Many chemical reactions need ENERGY, and they
won’t just happen on their own!!!
If you had to
use a ton of activation energy for every single reaction in your body, your body would never get anything done.
Many reactions need a lot of activation
energy
Enzymes. Enzymes are proteins that speed up chemical
reactions so that you don’t need a ton of activation energy. Aka “catalysts”
What can we use INSTEAD of a ton of activation energy?
Normally, reactants would have to find each
other and hit each other with a bunch of energy in order to react.
Enzymes have a specific spot on them where they can bring reactants together to react, so that doesn’t have to happen
Enzymes weaken the bonds of reactants, too. http://www.youtube.com/watch?v=V4OPO6JQL
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How an enzyme works
The reactants in a reaction sped up by
catalysts are called substrates. Catalysts and substrates bind together like a
lock and key
http://www.youtube.com/watch?v=3UsCRN6D
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http://www.youtube.com/watch?v=XTUm-75-PL4&feature=related pilot video
http://www.youtube.com/watch?v=feik6wOXFA0
Enzymes video
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