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AP CHEM Unit 5

TermDefinition
Factors that change reaction rate Molarity increase, Rate increases Temp increase, Rate increase Surface Area Increase, Rate increase
Catalyst Does not get used up in a reaction, but it lowers activation energy and increases rate of reaction (starts off as a reaction and then a product)
Intermediate Is created in a elementary step and used up in a subsequent elementary step (product and then reactant)
What is K dependent on? Temperature
0 order graph line is linear down, negative slope and line is longer than 1st equation= [x]t= k (time) + [x]^0
1st order graph line is linear down, negative slope and line is shorter than 0 order Consistent reaction for half-life equation= ln[y]t= -k(t) + ln[y]0
2nd order Positive linear slope Inconsistent reaction with half-lifw equation= 1/[z]t = k(time) + 1/[z]0
Exothermic Release energy (Enthalpy of a reaction is negative)
Endothermic Absorbs energy (Enthalpy of a reaction is positive)
Molecularity describes the number of molecules that have to collide in a elementary step
Unimolecular reactions that involve one one molecule
Bimolecular reactions that involve two molecules (elementary steps)
Termolecular reactions that involve 3 molecules (VERY RARE)
in order to increase collisions increase Molarity, surface area, temperature, and mole. DECREASE volume
Activation energy the minimum energy required that the particles need in order to react. This energy is needed to break BONDS.
Activated complex transition state between the reactants and products
Triangle H equation Energy products - Energy reactions
Collision Model for a Endothermic reaction Reactants start as increase and cut short and flat for products reactants are low while products are high
Collision Model for a Exothermic Reaction Reactants start high and products go low
Created by: JuliR
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