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### 18 Cards in this Set

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 What is the formula for First Order reaction? ln [A]t/[A]0= -kt What is the formula for Half life in a First Order reaction? t 1/2= .693/k What is the formula for a Second order reaction? 1/[A]t= k + 1/[A]0 What is the formula for Half life in a Second Order reaction? t 1/2= .693/k[A]0 What formulas are used for Equilibrium? K= [P]^D/R K= [C]^C [D]^D/[A]^A [B]^B Kp= Kc [RT]^Δn How is delta n figured? Moles of Product - Moles of Reactant What is the constant for R? .0821 What does T symbolize in the formula Kp=Kc[RT]^delta n Temperature Kelvin What things can increase the speed of a chemical change? HIGH CONCENTRATION: more reactants available PRESSURE: Increases concentration and packs molecules together TEMPERATURE: Increase the speed of molecules PARTICLE SIZE: Surface area increases CATALYST: Has ability to promote change without being used up STATE OF MATTER: Speed of molecules effect change DISSOLVED IN SOLUTION: Particle size = molecule size WHAT IT IS REACTING WITH: some are very reacting and some are not Describe the Le Chatelier's Principle If an external stress is applied to a system at chemical equilibrium, the system will adjust to partially offset the stress. Chemical Equilibrium Rates of forward and reverse reactions are equal and the concentraions of the reactants and products remains constant. Kinetics Study of the speed of a chemical change Substrate Substance enzymes act on. 1 enzyme/1 subtrate Rate Constant Fractional amount of something undergoing change for a certain amount of time Enzyme Proteins that act as biological catalysts Activation Energy Energy that must be inputted to start something off in a reaction. What are the two kinds of catalysts? Homogeneous Catalyst: Same state of matter as reactant Heterogeneous Catalyst: Different state of matter than reactant What are the formulas for Equilibrium? K= [P]^D/R K= [C]^C [D]^D/[A]^A [B]^B Kp= Kc [RT]^Δn