NAME______________________ 1046 EQUILIBRIUM HOMEWORK Dr. R. Houle
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DIRECTIONS: Write your answers in complete sentences and use science vocabulary. Pictures may be helpful, but you must label and explain all parts. |
1. Explain in terms of the Kinetic Molecular Theory (KMT) the following situations:
a). Why does compressing a gas raise the temperature of the system?
b). Explain why the density of a gas is so much lower than the density of its liquid form?
c). Explain in detail the dissolving process of KCl (s) in water.
d). Explain why the solid precipitate AgI (s) forms when solutions of KI (aq) and AgNO3 (aq) are mixed.
CHM 1046 EQUILIBRIUM HOMEWORK P2
2. The system ice (s) + energy water (l) Is in equilibrium at 0oC in a closed container.
What will be the effect on the system if:
a). Heat is supplied to the system
STRESS: _____________________________________________
DESIRE: ______________________________________________
SHIFT: _______________________________________________
FINAL VOLUME OF ICE: _________________________________
b). The pressure on the system is increased?
STRESS: _____________________________________________
DESIRE: ______________________________________________
SHIFT: _______________________________________________
FINAL VOLUME OF ICE: _________________________________
3. The system water (l) + energy vapor (g) Is in equilibrium at 20oC in a closed container.
What will be the effect on the system if:
a). The volume of the container is doubled but the amount of water (l) is the same as the original.
STRESS: _____________________________________________
DESIRE: ______________________________________________
SHIFT: _______________________________________________
FINAL VOLUME OF WATER (l): _________________________________
CHM 1046 EQUILIBRIUM HOMEWORK P3
b). The temperature of the system is decreased to 10oC?
STRESS: _____________________________________________
DESIRE: ______________________________________________
SHIFT: _______________________________________________
FINAL VOLUME OF WATER (l): _________________________________
c). The pressure exerted on the vapor (g) is doubled?
STRESS: _____________________________________________
DESIRE: ______________________________________________
SHIFT: _______________________________________________
FINAL VOLUME OF WATER (l): _________________________________
4. A solution system salt (s) + energy Ions (aq) Is in equilibrium at 20oC with some salt on the bottom of the container.
What will be the effect on the system if:
a). More salt (s) is added to the container?
STRESS: _____________________________________________
DESIRE: ______________________________________________
SHIFT: _______________________________________________
FINAL VOLUME OF salt (s): _________________________________
CHM 1046 EQUILIBRIUM HOMEWORK P4
b). The temperature decreases to 10oC?
STRESS: _____________________________________________
DESIRE: ______________________________________________
SHIFT: _______________________________________________
FINAL VOLUME OF WATER (l): _________________________________
c). The volume of the container is doubled but the volume of solution and the amount of salt is constant, that is, same as the original amounts?
STRESS: _____________________________________________
DESIRE: ______________________________________________
SHIFT: _______________________________________________
FINAL VOLUME OF WATER (l): _________________________________
NAME______________________ 1046 SOLUTION HOMEWORK Dr. R. Houle
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DIRECTIONS: You must show the equation used, substitute the number with units and record the final answer in proper significant digits with units in order to receive credit for the problems. THERE IS NO CREDIT FOR A FINAL ANSWER OR SLOPPY WORK THAT DOES NOT CLEARLY SHOW HOW YOU OBTAINED YOUR ANSWER. |
1a. Some sucrose ( common table sugar) is dissolved in water. How many moles of sugar are dissolved in 200.0 mL of solution if its concentration is 0.150 M? (ans. .0300 moles)
b). How many grams of sucrose, C12H22O11 , are dissolved in the 200.0 mL solution of 0.150 M? (ans. 10.30g)
2. A mass of 23.0g of ethyl alcohol, C2H5OH, is dissolved in 500.0 mL of water. What is the molal concentration of this solution? (ans. 1.00 m)
3. What is the mass of water in a 2.5 m solution of Ca(NO3)2 if the mass of the solute is 8.2 g?
(ans. 20 g)
CHM 1046 SOLUTION HOMEWORK P2
4. A mass of 98 g of sulfuric acid, H2SO4 , are dissolved in water to prepare a 0.50 M solution. What is the volume of the solution, in liters? ( ans. 2.0 L)
5. How much will the freezing point be lowered if enough sugar is dissolved in water to make a 0.50 molal solution? Kf = 1.86 oC/ molal ( ans. 0.93 oC )
b. How much will the boiling point be raised if enough Ca(NO3)2 is dissolved in water to make a 0.50 molal solution? Kb = 0.52 oC/ molal ( ans. 0.78 oC )
6. Suppose that 98.0 g of a nonelectrolyte are dissolved in 1.0 Kilograms of water. The freezing point of this solution is found to be -0.465 oC. What is the molecular mass of the solute? ( ans. 392 g/ mole)
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