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Kinetics
Equilibrium
Acids and Bases
Acid/Base Equilibrium
Misc/CH1150
100
The reaction 2N2O5 -> 4NO2 + O2 has a rate constant of 4.82E-3 s-1. What is the rate of reaction when [N2O5]=0.0240 M?
r=1.16E-4 M/s
100
What is the K expression for Ti(s) + 2Cl2(g) <-> TiCl4(l)?
K=1/[Cl2]^2
100
What are the conjagate acid/base pair for HCHO2(aq) + (PO4)3-(aq) <-> (CHO2)-(aq) + (HPO4)2-(aq)
HCHO2/(CHO2)- (HPO4)2-/(PO4)3-
100
Calculate the pH of a solution that is 0.12 M in HA and 0.11 M in A-. Ka=1.4E-4
3.81
100
What is the chemical name for Fe2(CO3)3.
Iron (III) carbonate
200
Wire the rate expression in terms of appearance and disappearance for: 2HBr(g) -> H2(g) + Br2(g)
rate = -d[HBr]/2dt = d[H2]/dt = d[Br2]/dt
200
If Kp=0.0752 for 2Cl2(g) + 2H2O(g) <-> 4HCl(g) + O2(g), what is Kp for 2HCl + (1/2)O2 -> Cl2 + H2O?
K''p=1/(Kp)^1/2=3.65
200
If solution A has a hydronium concentration that is 500 times greater than solution B, what is the difference in pH values of the two solutions?
[H+](A)=500[H+](B) dpH=-log(([H+](B))/([H+](A))) = 2.70
200
A 35.0 mL sample of 0.150 M acetic acid (Ka=1.8E-5) is titrated with 0.150M NaOH. What is the pH after 17.5 mL of base are added?
4.74
200
What are the oxidation numbers for the atoms in the compound HNO2?
H - +1 N - +3 O - -2
300
The rate constant for N2O5(g) -> 2NO2(g) + O2(g) is 6.82E-3 s-1. If you start with 0.0250 mol of N2O5 in 2.0 L, how many moles remain after 2.5 min?
[N2O5]=4.5E-3 M -> 9.0E-3 mols
300
At equilibrium P(PCl3)=0.124 atm, P(Cl2)=0.157 atm, and P(PCl5)=1.30 atm for the reaction PCl3(g) + Cl2(g) <-> PCl3(g). What is Kp?
Kp=66.8
300
What is the percent ionization of HA (Ka=1.9E-5) if the initial concentration is 0.400 M?
0.69%
300
Calculate the pH at the equivalence point when 35.0 mL of 0.150M acetic acid (Ka=1.8E-5) is titrated with 0.150M NaOH.
8.81
300
What is the lewis stucture for NO2?
. ::O=N-O::: 0 +1 -1
400
How can you graphically tell the difference between a mechanism that is first order or second order? (give the axes and trend)
Data from a first order mechanism will be a straight line with a negative slope when ln[A] is plotted against time. Data from a second order mechanism will be a straight line with a positive slope when 1/[A] is plotted against time.
400
The equilibrium constant for 2NO(g) <-> N2(g) + O2(g) is K=2.4E3. If [NO]o=0.200M, what are the equilibrium concentrations of all components?
[N2]=[O2]=0.099M [NO]=0.002M
400
For Malonic Acid (H2C3H2O4), Ka1=1.5E-3 and Ka2=2.0E-6. If the initial concentration of the acid is 0.0163 M, what is [C3H2O4 2-] at equilibrium?
2.0E-6 (is equal to Ka2)
400
If the molar solubility of CaF2 is 1.24E-3 mol/L, what is the Ksp?
7.63E-9
400
Does H2S have a dipole moment?
S has two bonds (to hydrogens) and two lone pair. These are arranged in a tetrahedral formation. The two lone pairs will make one side polar -> yes it has a dipole moment
500
Given the following mechanism, propose a rate law for the reaction: 2NO <-> N2O2 fast N2O2 + H2 -> N2O + H2O slow N2O + H2 -> N2 + H2O slow
rate=k[H2][NO]^2
500
The reaction 2SO2(g) + O2(g) <-> 2SO3(g) is exothermic. How does each of these changes affect the equilibrium? a) add O2 b) add heat c) add catalyst
a) -> b) <- c) none
500
Which is a stronger acid: HIO or HIO3? Explain.
HIO3. 1) It has more electronegative atoms. 2) The central atom oxidation number is higher. 3) It has resonance forms.
500
Calculate the solubility of LaF3 (Ksp=2E-19) in g/L in a solution containing 0.010M KF.
4E-11 g/L
500
What is the reaction for the combustion of C2H4O?
C2H4O + (5/2)O2 -> 2CO2 + 2H2O