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Big 7 - Chapter 5 CHEMICAL REACTIONS
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Big 7 - Chapter 5.1 Intro to Chemical Reactions

1. What is a Chemical Reaction?

1. How do we know its happening?

1. Reactants vs. Products

1. How to we begin a reaction?

1. Chemical Energy?

1. Exothermic Reaction

1. Endothermic Reaction

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1. What is a Chemical Reaction?

Results in a change of substances and
rearrangement of atoms
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• Some signs are
• Production of solid or gas
• Color change
• Odor change
• Energy released or absorbed

1. How can we tell that a chemical reaction is
   happening?

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1. Reaction Basics

Reactants are the chemicals you start
with Products are the chemicals you end with
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Spontaneous starts without energy
needed Non-spontaneous starts with the input of
energy
4. How do Reactions Start?
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5. Endothermic Reaction
A reaction that absorbs energy from the
environment (it feels cold)
Energy
Energy
Energy
Energy
Energy
Energy
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6. Exothermic Reaction
A reaction that releases energy from the
environment (it feels hot)
Energy
Energy
Energy
Energy
Energy
Energy
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7. Why would we want to do perform Chemical
reactions?

1. To make things that we dont have naturally.

1. To make things that are less expensive.

3. To release energy so we can use it to do
stuff.