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Rates
Equilibrium
Affects on Rate
Mystery
100
What is the rate expression with respect to HCl for the following reaction: Zn + 2HCl ---> ZnCl2 + H2
Rate = -1/2( Δ HCl / Δ t)
100
What is the generic equilibrium formula
Kf/Kr =[products]/[reactants]
100
What is a catalyses ?
Increases rate of reaction with out being consumed
100
Define reaction rate
Change in concentration of reactant or product as a function of time
200
What is the rate expression with respect to 2Na3PO4 for the following reaction: 3CaCl2 + 2Na3PO4 <---- Ca3(PO4)2 + 6NaCl
Rate = Δ Na3PO4 / Δt
200
Define Equilibrium
The rate of the forward reaction is equal to the rate of the reverse reaction
200
What is activation energy?
The minimum amount of energy needed to intiate the reaction
200
What are the two piece needed for a chemical reaction to occur?
1) Have to collide 2) Have to form a product that is more stable
300
Determine problem one's rate law
rate = 1.2 s^-1 M^-1 [A]^1 [B]^1
300
What is the equilibrium constant for: 3F2 (g) +Cl2 (g) <--->2CIF3(g)
Kc = [CIF3]2 / [F2]3[Cl2]
300
What are the four parts of the graph?
A: Activation energy B: Energy to break a bond C: Forming a bond D: Reaction path
300
Define Kinetics
Speed or rate of a chemical reaction
400
Determine the rate law for problem 2
rate = 3.0 x 10^-4 M^-1 S^-1
400
If Kc =7.5 x 10^-9 at 1000 K for the reaction N2 (g) + O2 (g) <----> 2NO(g), What is Kc at 1000 K for the reaction?
1.3 x 10^8
400
What three things affect the speed of a rate?
1) Temperature 2) Concentration (or pressure) 2) catalyses
400
What does the energy diagram show?
Catalyst lowers activating energy which increase the probability of the reaction occuring
500
Determine the rate law for problem 3
rate = 1.30 M^-2.4 S^-1
500
Write K for the following expression: Fe2O2 (s) + 3CO (g) <----> 2Fe (l) + 3CO2 (g)
K= [CO2]^3 (Pco2)^3 / [CO]^3 (Pco)^3
500
What is the rate law for the following equation if H2O2 is the rate limiting step? 5H2O2 + IO ----> 5H2O + I- + 3O2
rate = K [H2O2]^5 [IO]
500
For the reaction KCl8(g) <--> KCl5 + Cl3 the Kp = 1.17. If KCl8 = 7.5 atm, KCl5 =2.3 atm, and KCl3 = 3.9. Is the system at equilibrium?
Q = 1.20 (1.196) not at equilibrium Shift to products