62 Results
Vapor-Liquid Equilibrium   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
The Solubility Product   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
The pH of Solutions of Weak Bases   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
The pH of Solutions of Weak Acids   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
The Equilibrium Constant in Terms of Pressure   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
The Effect of a Change in Pressure   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Le Chatelier's Principle   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Predicting the Direction of a Reaction   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
The Molecular View of Equilibrium   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Effect of Adding a Reactant or Product   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Successive Approximation   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Calculating the Extent of a Reaction   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
The Law of Chemical Equilibrium   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
The Equilibrium Constant   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
The Equilibrium State   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Equilibrium Constants Revisited   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Solutions   
(Movie/Animation, Audio/Visual (9))
Reactions and demonstrations exploring the concepts of solutions.
Liquefaction of Carbon Dioxide   
(Movie/Animation, Audio/Visual (4))
Dry ice is placed into an acrylic plastic cylinder. A valve is closed and pressure in the cylinder increases. When the pressure reaches 350 kPa (50 psi) it stops increasing and liquid CO2 appears.
Orange Tornado: Precipitation of Mercury(II) Iodide - Version 2   
(Movie/Animation, Audio/Visual (4))
When mercury(II) nitrate and potassium iodide are combined with rapid stirring, an orange tornado of mercury(II) iodide is formed.
Precipitation Reactions   
(Movie/Animation, Audio/Visual (3))
Two versions of the Orange Tornado, two reactions under a microscope, and updated stills of other precipitation reactions provide dramatic visual displays of solid formation.
Orange Tornado: Precipitation of Mercury(II) Iodide - Version 1   
(Movie/Animation, Audio/Visual (3))
When mercury(II) nitrate and potassium iodide are combined with rapid stirring, an orange tornado of mercury(II) iodide is formed.
Nitrogen Oxides (GCMP)   
(Interactive Simulation, Software (1))
Nitrogen Oxides: this is a resource in the collection "General Chemistry Multimedia Problems". Two of the most important nitrogen oxides, N2O4 and NO2, are in equilibrium with each other. We are interested in how this equilibrium shifts with temperature. General Chemistry Multimedia Problems ask students questions about experiments they see presented using videos and images. The questions asked apply concepts from different parts of an introductory course, encouraging students to decompartmentalize the material.
Acids_and_Bases : BufferWeakWeak (14 Variations)   
(Assessment Material (1))
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_and_Bases : CalcSolnpH (5 Variations)   
(Assessment Material (1))
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_and_Bases : BufferWeakStrong (7 Variations)   
(Assessment Material (1))
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_and_Bases : pHBufferCalc (4 Variations)   
(Assessment Material (1))
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_and_Bases : pHDilution (6 Variations)   
(Assessment Material (1))
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_and_Bases : BufferingCapacity (20 Variations)   
(Assessment Material (1))
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_and_Bases : WeakAcidSolnpH (20 Variations)   
(Assessment Material (1))
Given an aqueous solution of 0.30 M acetic acid (Ka = 1.8 x 10-5), the pH is approximately ...
Acids_and_Bases : PercentDissociationKa (3 Variations)   
(Assessment Material (1))
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.

Equilibrium : MoreMolesAtEquil (19 Variations)   
(Assessment Material (1))
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 : ConvertKcKp (6 Variations)   
(Assessment Material (1))
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 : CalcKc (4 Variations)   
(Assessment Material (1))
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 : CalcKp (2 Variations)   
(Assessment Material (1))
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 : CalcRxnQuotient (13 Variations)   
(Assessment Material (1))
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 : EqConstConcData (4 Variations)   
(Assessment Material (1))
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 : CalcMolesAtEquil (15 Variations)   
(Assessment Material (1))
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 : EqConstRelationships (12 Variations)   
(Assessment Material (1))
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 : EquilAndRxnRates (8 Variations)   
(Assessment Material (1))

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 : InterpretKsp (16 Variations)   
(Assessment Material (1))
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 : ConcFromKsp (8 Variations)   
(Assessment Material (1))
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 : CommonIonEffect (9 Variations)   
(Assessment Material (1))
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 : SolubilityPressTemp (16 Variations)   
(Assessment Material (1))
How does increasing the temperature change the solubility of nitrogen in water?
Equilibrium : ICETables (16 Variations)   
(Assessment Material (1))
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 : InterpretEqConsts (12 Variations)   
(Assessment Material (1))
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 : EquilExpressions (15 Variations)   
(Assessment Material (1))
What is the correct equilibrium constant expression for the balanced reaction shown below?

C3H8(g) + 5O2(g) 3CO2(g) + 4H2O(l)

Equilibrium : RxnDirectAndTemp (16 Variations)   
(Assessment Material (1))
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 : LeChatPrinciple (18 Variations)   
(Assessment Material (1))
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 : KspSaturation (12 Variations)   
(Assessment Material (1))
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 : KspExpressions (10 Variations)   
(Assessment Material (1))
What is the solubility product expression for Ag3PO4?
Equilibrium : EquilTrueFalse (4 Variations)   
(Assessment Material (1))
Which of the following statements is a true statement concerning a reaction that has reached a state of equilibrium?
Ionic Equilibria in Aqueous Solutions in Foods   
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A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
ChemPaths 104 M Apr 11   
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Today in Chem 104: * Lecture: pH; Acid-Base Equilibria; Ionization * Reading: Kotz: Ch. 17, Sec. 6-7 Moore: Ch. 16, Sec. 7-8 * Homework #10 due by 11:55 PM F Apr 15 * Quiz in second discussion section this week * Lab this week is #6, Acid and Base Solutions
Calcium tartrate and treatment of wine waste-waters   
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A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
The effect of polyols on the pH of buffer solutions in foods   
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A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Buffer solutions and the production of food ingredients   
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A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Buffer solutions and the stability of food additives   
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A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
ChemPaths 104 F Mar 11   
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Today in Chem 104: * Lecture: Problem-Solving Session * No assigned reading for today. * Homework #7 due by 11:55 pm Today!
ChemPaths 104 W Mar 9   
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Today in Chem 104: * Lecture: Chemical Equilibrium * Reading: Kotz: Ch. 16, Sec.6 Moore: Ch. 14, Sec. 6, 8 * Homework #7 due by 11:55 pm F Mar 11 * Quiz #5 given in second discussion section this week.
ChemPaths 104 M Mar 7   
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Today in Chem 104: * Lecture: Chemical Equilibrium * Reading: Kotz: Ch. 16, Sec. 3-5 Moore: Ch. 14, Sec. 3-5 * Homework #7 due by 11:55 pm F Mar 11 * Quiz #5 given in second discussion section this week.
ChemPaths 104 F Mar 4   
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Today in Chem 104: * Lecture: Problem-Solving Session * No assigned reading for today. * Homework #6 due by 11:55 pm Today!
ChemPaths 104 W Mar 2   
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Today in Chem 104: * Lecture: Chemical Equilibrium * Reading: Kotz: Ch. 16, Sec. 1-2 Moore: Ch. 14, Sec. 1-2 * Homework #6 due by 11:55 pm F Mar 4 * Quiz #4 given in second discussion section this week * Biomolecules Tutorial: Enzymes and Moodle Quiz due Today at 11:55 pm