Review Chemical Equations May 16, 2016 http://ahewagama.weebly.com/chemistry-2016.html

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How do you know when a chemical change has occurred? Temperature change Color change Release of a gas Precipitation

Chemical Reactions Chemical Reactions are represented by balanced equations There are four main types of reactions Synthesis Decomposition Replacement Combustion Reactions in Aqueous solutions Double replacement reactions occur between substances in aqueous solutions and produce precipitates, water, or gases

Synthesis Reactions

Combustion Reaction Combustion as well as a synthesis reaction Combustion but not a synthesis reaction

Decomposition Reaction 2NaN3 (s) 2Na(s) + 3N2 (g) Sodium azide Sodium Nitrogen gas

Replacement Reactions

Symbols (s) = solid (g) = gas (aq) = aqueous (a solution in water) Yields (reacts to from)

Representing a chemical reaction Word equation Reactant1 + Reactant2 Product1 + Product2 Aluminum + Bromine Aluminum Bromide Skeletal Equation Al(s) + Br2(g) AlBr3 Balanced Chemical Equation 2Al(s) + 3Br2(g) 2AlBr3

Exit Questions Write the chemical equation for the following reactions Hydrogen and Bromine gases react to yield hydrogen bromide. When carbon dioxide and oxygen react, carbon dioxide forms Extra credit challenge: Write the word equation and the skeleton equation for the following reaction. When heated, solid potassium chlorate yields solid potassium chloride and oxygen gas.

Writing a balanced Chemical Equation NaOH(aq) + CaBr2(aq) Ca(OH)2 + NaBr(aq)