Ch. 18 Reaction Rates.

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Presentation transcript:

Ch. 18 Reaction Rates

2 Types of Reactions Endothermic: Energy is absorbed into the system.

Exothermic: Energy is released by the system.

Examples of Exothermic: Anything that gives off heat Running your car             Charging your cell phone Exercising                        Lighting a bunsen burner Rubbing your hands together Examples of Endothermic: Anything that absorbs heat Sweating (evaporation)             Melting ice cubes Cooking an egg                           Baking a cake

What causes reactions to speed up? Adding energy to the system will increase the frequency of collisions between molecules, leading to more reactions occurring.  What causes reactions to speed up?

Catalysts Provide an alternate pathway for the reaction which results in a lower activation energy.

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