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Physical Science Final Review #4
Reactions
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Signs of a chemical reaction
Bubbles (gas forming) Color change Odor Change in temperature Light or sound
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Reactions Chemical reactions use energy to break bonds and to form new ones Reactants are on the left side of the reaction Products are on the right Endothermic reactions Need heat as a reactant Exothermic reactions Give off heat as a product Catalysts speed up chemical reactions
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Types of Reactions Synthesis Decomposition Single Replacement
Reactant + Reactant Product Decomposition Reactant Product + Product Single Replacement Element + Compound New Element + New Compound Double Replacement Compound + Compound New Compound + New Compound Combustion Reactant + O2 CO2 + H2O
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Balancing Chemical Reactions
Write out all elements in the same order on the reactant side and product side Count how many of each you have Start with your biggest difference Multiply your numbers. If it is a compound you must multiply the other element too. Double check at the end to make sure everything is balance
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Balancing Practice ____Al + ____Fe3N2 ____AlN + ____Fe
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