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- Unit 7 Chemical Equations Evidence of a chemical reaction heat light sound gas emitted color change odor A reaction has occurred if the chemical

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Unit 7: Chemical Equations Evidence of a chemical reaction: heat, light, sound, gas emitted, color change, odor 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 collision theory activation energy : energy needed to start a reaction Chemical reactions release or absorb energy. exothermic reactions endothermic reactions
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2 catalyst : speeds up reaction wo /being consumed …it lowers the activation energy (AE) Without catalyst With catalyst time time Examples: enzymes catalyze biochemical reactions catalytic converters convert CO into CO 2 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)
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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 NaI(aq) + Pb(NO 3 ) 2 (aq) PbI 2 (s) + NaNO 3 (aq)
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4 Factors that influence the rate of a reaction To make reaction rate increase… concentration of reactants particle size temperature mechanical mixing pressure catalyst use one nature of reactants N/A In a reaction: atoms are rearranged AND mass charge are conserved energy Balancing Chemical Equations law of conservation same # of atoms of each type of mass on each side of equation solid iron reacts with oxygen gas to yield solid iron (III) oxide
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This note was uploaded on 11/09/2011 for the course CHEM 110 taught by Professor Sullivan during the Fall '10 term at BYU.

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- Unit 7 Chemical Equations Evidence of a chemical reaction heat light sound gas emitted color change odor A reaction has occurred if the chemical

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