Chapter 20 How Chemicals React.

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Presentation transcript:

Chapter 20 How Chemicals React

Chemical Reactions are Represented by Chemical Equations Reactants  Products Law of mass conservation- matter is neither created nor destroyed.

Balancing Chemical equations

Chemical Reactions Can Be Slow or Fast The reaction rate is how fast a reaction takes.

Activation Energy Activation energy- the minimum energy required to start a reaction.

Catalysts A catalyst is a substance that speeds up a reaction.

Exothermic and Endothermic Reactions Exothermic reactions – Release energy ( fire explosions) Endothermic reactions- absorb energy ( cold compress)