Topic 6 – Rates of Reaction & Energy Changes
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7 Terms
Rates of Reaction
Rate = change in quantity / change in time; speed reactants are used or products formed
Factors Affecting Rates & Collision Theory
Reaction rate increases with temperature; concentration; pressure; surface area; catalysts; collisions must have sufficient energy and correct orientation
Measuring Rates from Graph
Rate is determined from gradient of concentration-time graph
Exothermic Reactions
Exothermic reactions release energy; temperature rises; delta H negative; bond making > bond breaking
Endothermic Reactions
Endothermic reactions absorb energy; temperature drops; delta H positive; bond breaking > bond making
Bond Energies
Bond energy measures energy required to break a bond; used to calculate energy changes
Note 
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