u7lectout

u7lectout - Unit 7: Chemical Equations Name: _ Evidence of...

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Unit 7: Chemical Equations Name: ____________________ Evidence of a chemical reaction: A reaction has occurred if the chemical and physical properties of the reactants and products differ. For a reaction to occur, particles of reactants must collide, and with sufficient energy activation energy : Chemical reactions release or absorb energy. catalyst : speeds up reaction wo /being consumed time time Examples: 1
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Reaction Conditions and Terminology Certain symbols give more info about a reaction. (s) = solid (l) = liquid (g) = gas (aq) = aqueous (dissolved in H 2 O) More on aqueous… -- “soluble” or “in solution” also indicate that a substance is dissolved in water (usually) -- acids are aqueous solutions Other symbols… means “yields” or “produces” means heat is added to the reaction MgCO 3 (s) MgO(s) + CO 2 (g) Temp. at which we perform rxn. might be given. C 6 H 5 Cl + NaOH C 6 H 5 OH + NaCl The catalyst used might be given. C 2 H 4 (g) + H 2 (g) C 2 H 6 (g) precipitate : a solid product that forms in an aqueous solution reaction Factors that influence the rate of a reaction To make reaction rate increase… concentration of reactants
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u7lectout - Unit 7: Chemical Equations Name: _ Evidence of...

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