| Assessment Questions: 29 results |
Equilibrium : EquilTrueFalse (4 Variations)
Which of the following statements is a true statement concerning a reaction that has reached a state of equilibrium?
Equilibrium
|
Equilibrium : KspExpressions (10 Variations)
What is the solubility product expression for Ag3PO4?
Equilibrium
|
Equilibrium : KspSaturation (12 Variations)
Zn(OH)2 has a Ksp of 4.5 x 10-17. If you have a solution of Zn(OH)2 that has a hydroxide ion concentration equal to 4.6 x 10-6 mol/L, the solution is ... (Assume that the only relevant reaction is the solubility-product equilibrium.)
Equilibrium
|
Equilibrium : LeChatPrinciple (18 Variations)
Consider the following equilibrium, established in a 2 L flask at 30oC.
CO(g) + H2O(g)
CO2(g) + H2(g)
H0= -41.2 kJ
What will happen to the concentration of CO2 if the temperature is increased?
Equilibrium
|
Equilibrium : RxnDirectAndTemp (16 Variations)
2 SO2(g) + O2(g)
2 SO3(g)
The reaction above has an equilibrium constant of 0.25 at 830oC, and Horxn = -197.78 kJ/mol under standard conditions. Under which conditions will this reaction produce the most sulfur trioxide?
Equilibrium
|
Equilibrium : EquilExpressions (15 Variations)
What is the correct equilibrium constant expression for the balanced reaction shown below?
C3H8(g) + 5O2(g)
3CO2(g) + 4H2O(l)
Equilibrium
|
Equilibrium : InterpretEqConsts (12 Variations)
The following reaction has an equilibrium constant of 1.2x1018 at 25oC.
CH4(g) + Cl2(g)
CH3Cl(g) + HCl(g)
Which of the following statements is true?
Equilibrium
|
Equilibrium : ICETables (16 Variations) 2C2H2(g) + 5O2(g) 4CO2(g) + 2H2O(g) You have 0.4 moles C2H2 and 0.2 moles O2 present initially in a 5L flask. You allow the reaction to run until it reaches equilibrium. Which of the following is the correct ICE table for this process?
Equilibrium
|
Equilibrium : SolubilityPressTemp (16 Variations)
How does increasing the temperature change the solubility of nitrogen in water?
Equilibrium
|
Equilibrium : CommonIonEffect (9 Variations)
The molar solubility of lead(II) fluoride (PbF2) is
2.1 x 10-3 mol/L in pure water at 25oC. What is the molar solubility of lead(II) fluoride in 0.10 M NaF at 25oC? (Assume that the only relevant reaction is the solubility-product equilibrium.)
Equilibrium |
Chemometrics
|
Equilibrium : ConcFromKsp (8 Variations)
The Ksp of BaF2 is
1.7 x 10-6 mol/L in water at 25oC. What is the concentration of barium ions in equilibrium with solid barium fluoride? (Assume that the only relevant reaction is the solubility-product equilibrium.)
Equilibrium |
Chemometrics
|
Equilibrium : InterpretKsp (16 Variations)
Which of the following salts would give you the highest concentration of phosphate ions in solution if you placed 1 mole of the salt in a liter of water?
Equilibrium |
Chemometrics
|
Equilibrium : EquilAndRxnRates (8 Variations)
For the reaction of A B, which of the following statements about the rates of forward and reverse reactions is true at time x?

Equilibrium |
Kinetics
|
Equilibrium : EqConstRelationships (12 Variations)
The equilibrium constant for the reaction of hydrogen gas and ethene to produce ethane under certain conditions is 9.8 x 1018.
H2(g) + C2H4(g)
C2H6(g) K = 9.8 x 1018
What is the equilibrium constant for the following reaction under the same conditions?
C2H6(g)
H2(g) + C2H4(g) K = ?
Equilibrium |
Chemometrics
|
Equilibrium : CalcMolesAtEquil (15 Variations)
The following reaction has an equilibrium constant of 0.083 at 900oC.
COCl2(g)
CO(g) + Cl2(g)
If you have 1.00 mole of COCl2(g) in a 1.00L container initially, how many moles of COCl2 will be present when the system reaches equilibrium?
Equilibrium |
Chemometrics
|
Equilibrium : EqConstConcData (4 Variations)
SbCl5(g)
SbCl3(g) + Cl2(g)
You have 0.50 mol SbCl5 present initially in a 1.0L flask. The system is allowed to reach equilibrium at 450oC. There is 0.10 mol Cl2 present at equilibrium. What is the equilibrium constant, K?
Equilibrium |
Chemometrics
|
Equilibrium : CalcRxnQuotient (13 Variations) In an experiment, 4.44 mol of SO2, 7.93 mol of O2 and 4.03 mol of SO3 are placed in a 2.0L reaction vessel at a certain temperature. Calculate the reaction quotient, Q, for the reaction as written:
What is the calculated reaction quotient, Q? {2:NUMERICAL:=2.1e-1:1e-2#Correct! ~%50%2.1e-1:5e-2#Close but not quite right}
If Kc for this reaction at the temperature of the experiment is 3.7 x 103, will the reaction move toward the left or toward the right? {1:MULTICHOICE:left#Sorry, that's wrong.~=right#Correct!}
Equilibrium |
Chemometrics
|
Equilibrium : CalcKp (2 Variations)
In one experiment chemists studied the formation of phosgene, COCl2, by mixing {y} atm of carbon monoxide and {z} atm of Cl2 in a reaction vessel at 700K. After the system reached equilibrium, the total pressure was {x} atm. Calculate Kp for the reaction.
Hint: Remember that the total pressure is the sum of all the partial pressures.
Note:
Do Not use scientific notation
DO NOT use spaces
DO NOT write in the units.
Be sure to write your answer with only one decimal place even if this is not the correct number of significant figures.
Equilibrium |
Chemometrics
|
Equilibrium : CalcKc (4 Variations)
A container initially has {y} M ammonia at a certain temperature. When the system reaches equilibrium the concentration of ammonia is {x} M. Calculate Kc for the following reaction as written.
Note:
Answers must be written using scientific notation with "e"
DO NOT use spaces
DO NOT write in the units.
Be sure to use three significant figures.
eg: 2.44e-5
Equilibrium |
Chemometrics
|
Equilibrium : ConvertKcKp (6 Variations) Nitrosyl bromide is formed from nitrogen oxide and bromine:
Kp for this reaction is {x} at {y}°C. Calculate Kc at this temperature. (R = 0.0821 L atm/mol K)
Note: DO NOT use scientific notation Use integers (no decimal places) even is this is not the correct number of significant figures. DO NOT write in the units. eg: 18
Equilibrium |
Chemometrics
|
Equilibrium : MoreMolesAtEquil (19 Variations)
The following reaction has an equilibrium constant of 0.050 at a given temperature.
N2(g)+ O2(g)
2NO(g)
If you have 0.75 moles of N2(g) and 0.75 moles of O2(g) in a 2.0L container initially, how many moles of N2 will be present when the system reaches equilibrium?
Equilibrium |
Chemometrics
|
Acids_and_Bases : PercentDissociationKa (3 Variations) Calculate the percent dissociation in a {x}M aqueous solution of the weak acid HA. (Ka = {y} x 10-4)
Enter your answer to ONE decimal place. DO NOT use scientic notation. DO NOT write in the units.
Acids / Bases |
Reactions |
Aqueous Solution Chemistry |
Equilibrium
|
Acids_and_Bases : WeakAcidSolnpH (20 Variations)
Given an aqueous solution of 0.30 M acetic acid (Ka = 1.8 x 10-5), the pH is approximately ...
Acids / Bases |
Reactions |
Aqueous Solution Chemistry |
pH |
Equilibrium
|
Acids_and_Bases : BufferingCapacity (20 Variations) If a buffer is prepared using 0.75 mol CH3COOH and 0.45 mol CH3COO- in 1 liter of aqueous solution, is the buffering capacity of the solution great enough to maintain its pH if 10 g NaOH is added?
Acids / Bases |
Reactions |
Aqueous Solution Chemistry |
pH |
Equilibrium
|
Acids_and_Bases : pHDilution (6 Variations)
What is the pH of a solution made by diluting {x} mL of {y} M HNO3(aq) to a total volume of 500 mL?
Enter your answer to two decimal places.
DO NOT use scientific notation
Acids / Bases |
Reactions |
Aqueous Solution Chemistry |
pH |
Equilibrium
|
Acids_and_Bases : pHBufferCalc (4 Variations)
Calculate the pH of a buffer solution containing {x}M NH3 and {y}M NH4NO3.
Enter your answer to TWO decimal places.
DO NOT use scientific notation.
DO NOT enter units
eg: 4.55
Acids / Bases |
Reactions |
Aqueous Solution Chemistry |
pH |
Equilibrium
|
Acids_and_Bases : BufferWeakStrong (7 Variations) How many mL of a 2.50 M HCl solution must be added to 500 mL of a 0.150 M CO32- solution to make a buffer with pH = 10.00?
Acids / Bases |
Reactions |
Aqueous Solution Chemistry |
pH |
Equilibrium
|
Acids_and_Bases : CalcSolnpH (5 Variations)
Use this acid/base table to answer the question below.
Calculate the pH of a {x}M sodium acetate solution.
DO NOT use scientific notation
Enter your answer to two decimal places.
DO NOT enter units
Acids / Bases |
Reactions |
Aqueous Solution Chemistry |
pH |
Equilibrium
|
Acids_and_Bases : BufferWeakWeak (14 Variations) What mass of potassium bicarbonate (KHCO3) must be added to 500 mL of a 0.200 M carbonic acid solution to make a buffer with pH = 6.30?
Acids / Bases |
Reactions |
Aqueous Solution Chemistry |
pH |
Equilibrium
|