Chemistry Name______
Chapters 12, 14, & 15 Worksheets
Worksheet # 1. Graham’s Law
1. Compare the rate of argon gas to the rate of neon gas at the same temperature.
2. How many times faster than chlorine gas does nitrogen gas travel?
3. What is the rate of fluorine gas compared to helium gas?
Worksheet # 2. Dalton’s Law of Partial Pressures
1. A eudiometer tube holds hydrogen gas with a pressure of 735.5 mm Hg and water vapor with a pressure of 10.0 mm Hg. What is the total pressure in the tube?
2. The gas in a eudiometer has a total pressure of 750.0 mm Hg. If 740.0 mm Hg is due to pressure of hydrogen gas, what pressure is due to water vapor?
Worksheet # 3. Mole fraction
1. You have 2.5 moles hydrogen gas, 3.5 moles oxygen gas, and 4.0 moles nitrogen gas. What is the mole fraction of each gas?
2. You have 3.0 grams of hydrogen gas, 10.0 grams of oxygen gas, and 50.0 grams of nitrogen gas. What is the mole fraction of each gas?
3. A container holds 5.0 g of helium and 10.0 g of oxygen. What is the mole fraction of each gas?
Worksheet # 4. Partial Pressure from Mole Fraction
1. Referring to the gas in Worksheet # 3, Question 1, if the total pressure in the container is 800.0 mm Hg, what is the partial pressure of each gas?
2. Re WS2, Q2, what is the partial pressure of each gas if the total pressure is 650.0 mm Hg?
3. Re WS2, Q3, if the total pressure is 760.0 mm Hg, what is the partial pressure of each gas?
Worksheet # 5. Specific Heat Calculations
1. How much energy is required to heat up 25.0 g of water from 5oC to 25oC?
2. How much energy is needed to heat up 40.0 g of water 20oC?
3. How much energy is needed to heat up 25.0 g of water from 40oC to 60oC?
4. How much energy is needed to change the temperature of 50.0 g of water 50oC?
Worksheet # 6. Heat of Fusion Calculations
1. How much energy is needed to melt 25.0 g of ice at the melting point?
2. How much energy is needed to melt 50.0 g of ice at the melting point?
3. How much energy is required to melt 75.0 g of ice at the melting point?
4. How much energy is required to melt 100.0 g of ice at the melting point?
Worksheet # 7. Heat of Vaporization Calculations
1. How much energy is required to vaporize 25.0 g of water at the boiling point?
2. How much energy is required to evaporate 50.0 g of water at the boiling point?
3. How much energy is needed to boil 58.0 g of water at the boiling point?
4. How much energy is needed to vaporize 32.0 g of water at the boiling point?
Worksheet # 8. Mixed Energy Calculations.
1. How much energy is needed to evaporate 45.0 g of water at 100 oC ?
2. How much energy is needed to heat up 25.0 g of water from 20.0oC to 50.0oC?
3. How much energy is required to melt 33.0 g of ice at O oC?
4. How much energy is needed to change the temperature of 42.0 g of water from 80.0oC to 100.0oC?
5. How much energy is required to vaporize 30.0 g of water at the boiling point?
Worksheet # 9. Energy Calculations.
1. How much energy is required to change 5.00 g of ice at 0.00 oC to water at 90.0 oC?
2. How much energy is required to change 5.00 g of ice at 0.00 oC to water at 100.0 oC?
3. How much energy is needed to change 5.00 g of ice at 0.00 oC to steam at 100.0 oC?
4. How much energy is required to change 25.0 g of water at 0.00 oC to steam at 100.0 oC?
5. How much energy is needed to change 12.0 g of ice at –10.0 oC to water at 25.0 oC?
6. How much energy is needed to convert 18.0 g of water at 90.0 oC to vapor at 110.0 oC?
Worksheet # 10. Le Chatelier’s Principle
Using the reactions below, tell which direction each reaction will shift under the conditions listed.
1. Using Reaction # 1, if the temperature is increased?
2. Using Reaction # 2, if the amount of liquid water is increased?
3. Using Reaction # 3, if the pressure is doubled?
4. Using Reaction # 4, if the amount of oxygen gas is increased?
5. Using Reaction # 5, if the amount of CaO is decreased?
6. Using Reaction # 5, if the temperature is decreased?
Reactions:
1. N2 (g) + 3 H2 (g) çà 2 NH3 (g) + energy
2. H2O (l) + energy ßà H2O (g)
3. N2 (g) + O2 (g) + energy ßà 2 NO (g)
4. 3 O2 (g) + energy ßà 2 O3 (g)
5. CaCO3 (s) + energy ßà CaO (s) + CO2 (g)
Worksheet # 11. Molarity
1. If 25.0 g of NaCl are dissolved in 500.0 mL of solution, what is the molarity of the solution?
2. If 50.0 g of C6H12O6 are dissolved in 250.0 mL of solution, what is the molarity of the solution?
Worksheet # 12. Molality
1. If 25.0 g of NaCl are dissolved in 525.0 g of water, what is the molality of the solution?
2. If 50.0 g of Mg(OH)2 are dissolved in 750.0 g of water, what is the molality of the solution?
Worksheet 13. Review Worksheet
1. How much energy is required to heat 10.0 g of water from 50.0oC to 75.0oC?
2. How much energy is needed to melt 25.0 g of ice at 0.00oC?
3. How much energy is need to vaporize 30.0 g of water at 100.0oC?
4. How much energy is required to change 10.00 g of ice at 0.00oC to steam at 100.0oC?
5. If 20.0 g of KOH is added to 80.0 g of water, what is the percent by mass of the solution?
6. If 40.0 g of NaOH is added to 100.0 g of water, what is the percent by mass of the solution?
7. If 50.0 g of CH3OH is added to 1000.0 g of water, what is the molality of the solution?
8. If 25.0 g of C2H5OH is added to 2000.0 g of water, what is the molality of the solution?
9. If 50.0 g of NaCl are used to make 1.00 liter of solution, what is the molarity of the solution?
10. If 200.0 g of KOH are used to make 2.00 liters of solution, what is the molarity of the solution?
11. If 50.0 g of CH3OH is added to 1000.0 g of water, at what temperature will the solution freeze?
12. If 25.0 g of C2H5OH is added to 2000.0 g of water, at what temperature will the solution boil?
13. A sucrose-in-water solution raises the boiling point of othe solvent to 100.13oC. What is the molality of the solution?
14. Tests show that 18.0 g of a compound dissolved in 1.00 kg of water raises the boiling point by 0.051oC. What is the molar mass of the compound?
15. What is the freezing point of an aqueous solution that boils at 100.05oC?