% yield, heats of reactions
Gas Laws
Concentration
Dilution, Stoichiometry
Solubility, net/complete, equilibruim
100
Given the following reaction
Zn + 2HCl -> ZnCl2 + H2
How many grams of ZnCl2 will be produced from 22.0 grams of Zn and 14 grams of HCl
26.2g ZnCl2
100
write out all the gas laws you know
Boyles
Charles
Avogadros
Gay-Lussacs
Combined
PV=nRT
100
A solution is made by dissolving 42.23g of NH4Cl into enough water to make 500mL of solution. Calculate its molarity
1.579M
100
A 10.0 mL sample of an unknown H3PO4 solution requires 112mL of .1 M KOH to completely react with H3PO4. What was the concentration of the unknown H3PO4 solution? (it is a 1 mol H3PO4 to 3 mol KOH ratio)
.373 M
100
Consider the reaction.
2 H2S(g)⇌2 H2(g)+S2(g)
An equilibrium mixture of this reaction at a certain temperature has [H2S]=0.562 M, [H2]=2.74×10−2 M, and [S2]=7.54×10−3 M What is the value of the equilibrium constant at this temperature?
1.79 x 10^-5
200
Using the following equation,
2HCl + CaCO3 -> CaCl2 + H2O+ CO2
What is the theoretical yield of CO2 if 4.5 grams of HCl are created with 15 grams of CaCO3?
2.71 grams CO2
HCl is the limiting reactant
200
A 40.0L balloon is filled with air at sea level (1.0 atm, 25 degrees Celcius). It is tied to a rack and thrown in a cold body of water, and it sinks to the point where the temp is 40.0 degrees Celcius and the pressure is 11.0 atm. What is the new volume?
3.38 L
200
A chemist needs to prepare 3.0L of a .250 M solution of KMnO4. What mass of KMnO4 do they need to make the solution
119g KMnO4
200
A 122mL sample of a 1.2 M sucrose solution is diluted to 500mL. What is the molarity of the diluted solution?
.29M
200
Write a molecular equation for the precipitation reaction that occurs (if any) when each pair of solutions is mixed. If no reaction occurs, write NO REACTION.
sodium carbonate and lead(II) nitrate
potassium sulfate and lead(II) acetate
300
Consider the equation for the combustion of acetone (C3H6O), the main ingredient in nail polish remover:
C3H6O(l)+4 O2(g)→3 CO2(g)+3H2O(g)
ΔHrxn=−1790 kJ
If a bottle of nail polish remover contains 155 g of acetone, how much heat is released by its complete combustion?
4.78×10^3 kJ
300
96.0g of gas occupies 48.0L at 700mmHg and 20 degrees Celcius. What is its molecular weight?
52.2g/mol
300
Ocean water contains 3.5% NaCl by mass. What mass of ocean water in grams contains 45.8 g of NaCl?
1.3 x 10^3 g
300
How much of a 12.0 M HNO3 solution should you use to make 850.0 mL of a 0.250 M HNO3 solution? (in mL)
17.7 mL
300
Write balanced complete ionic and net ionic equations for each reaction.
AgNO3(aq)+KCl(aq)→AgCl(s)+KNO3(aq)
CaS(aq)+CuCl2(aq)→CuS(s)+CaCl2(aq)
400
Phosphorous reacts with bromine to form phosphorous tribromide. If 35.0 grams of bromine are reacted and 27.9 grams of phosphorous tribromide are formed, what is the percent yield?
2 P + 3 Br2->2 PBr3
70.63% Percent yield
400
A heliox deep-sea diving mixture contains 4.0% oxygen and 96.0% helium. What is the partial pressure of oxygen when this mixture is delivered at a total pressure of 8.5 atm?
.34 atm
400
A 205-mL sample of ocean water contains 6.8 g of NaCl. What is the molarity of the solution with respect to NaCl?
.57 M
400
Consider the reaction:
2 K3PO4(aq)+3 NiCl2(aq)→Ni3(PO4)2(s)+6 KCl(aq)
What volume of 0.225 M K3PO4 solution is necessary to completely react with 134 mL of 0.0112 M NiCl2?
4.45 mL
400
Write an equilibrium expression for each chemical equation.
2 NO2(g)⇌N2O4(g)2
2 BrNO(g)⇌2 NO(g)+Br2(g)
Keq=[N2O4]/[NO2]^2
Keq=[NO]^2[Br2]/[BrNO]^2
500
Hydrogen peroxide decomposes according to the following thermochemical reaction:
H2O2(l) → H2O(l) + 1/2 O2(g); ΔH = -98.2 kJ
Calculate the change in enthalpy, ΔH, when 1.00 g of hydrogen peroxide decomposes.
-2.9 kj
500
A gas occupies 35.0 Liters at a temperature of 75.0 decrees C. What will its volume be if it is cooled to 25.0 degrees C?
30 L
500
How many grams of BaCl2 will be required to prepare 185 mL of a 0.675 M Solution?
26 g
500
In a laboratory, Qem dissolved 11.2 g of sugar in water, and then he poured the solution into a 250-mL volume flask. He added enough water to make the solution exactly 250.00 mL. What is the concentration of the solution he has prepared?
.131 M
500
For each equilibrium constant, indicate if you would expect an equilibrium reaction mixture to be dominated by reactants or by products, or to contain significant amounts of both.
Keq=5.2×1017
Keq=1.24
a. Products
B. Both