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Published byWendy Elizabeth Booth Modified over 9 years ago
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Introduction to Chemical Reactions Making new substances
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Chemical Reactions are Everywhere CookingRespiration
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Hair Dye Auto Fuel
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Clues to a Chemical Reaction Color Change Precipitate Formation
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Clues to Chemical Reactions Gas Formation Odor
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Clues to Chemical Reactions Temperature Change Change in Acidity (pH)
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Representing Chemical Reactions Reactions are shown using chemical equations Solid Sodium combines with Chlorine gas to make solid Sodium Chloride: 2Na (s) + Cl2 (g) 2NaCl
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Parts of Chemical Equations
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Symbols used in Chemical Equations SymbolPurpose +Separates more than one reactant or product Separates reactants from products. Indicates direction of reaction (s)Identifies a solid state (aq)Identifies that something is dissolved in water (l)Identifies liquid state (g)Identifies gaseous state
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Endothermic and Exothermic Reactions “Exo-” means exit Energy is released by the reaction New products feels warmer “Endo-” means enter Energy is absorbed by the reaction New product feels cooler
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Endothermic and Exothermic Reactions
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Activation Energy Energy used to initiate a reaction Examples: 1.Adding Heat 2.Mixing or Stirring 3.Adding a catalyst Catalyst - something that speeds up a reaction without interfering with the reaction.
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