New Worksheet - Chemistry - More Problems on the Combined Gas Law

1. A sample of a gas occupies 450 mL at a pressure of 0.750 atm. If the temperature is held constant and the gas expands to 1000 mL what will the new pressure be?
Answer: ________________

2. A sample of oxygen occupies 5.2 L at 955 torr. What volume will it occupy at 760 torr?
Answer: ________________

3. A sample of nitrogen gas occupies 155 mL at 25 degrees C. What volume will it occupy at – 25 degrees C at constant pressure?
Answer: ________________

4. The volume of a gas is 2.50 L at 20 degrees C and the pressure is held constant.
a. What is the volume of the gas at 200 degrees C? Answer: ________________
b. At what temperature (in C) will the volume be 5.00 L? Answer: ________________
c. At what temperature (in C) will the volume be 1.50 L? Answer: ________________
d. What is the volume of the gas at – 100 degrees C? Answer: ________________

5. Calculate the number of moles of oxygen in 1.00 L at 25 degrees C and 1.00 atm.
Answer: ________________

6. What pressure is needed to confine 6.00 moles of ideal gas in a volume of 4.45 L at 35 degrees C?
Answer: ________________

7. What volume will 0.459 moles of CO2 occupy at 100 degrees C and 0.95 atm?
Answer: ________________

8. At what temperature (in degrees C) will 1.58 moles of H2 occupy 20.0 L at 955 torr?
Answer: ________________

9. What is the volume of 7.50 moles of He at 800 torr and – 10.0 degrees C?
Answer: ________________


© 2017 Laura Glassel – lizzietutoring.blogspot.com

New Worksheet - Chemistry - Molarity

Problem 1
Calculate the molarity of a 2.5 L solution made with 200.0 g of calcium chloride.
Answer: _______________________

Problem 2
How many grams of NaCl would be required to produce a 3.0 M solution with a volume of 0.5 L?
Answer: _______________________

Problem 3
How many grams of NaOH would be required to produce a 1.25 M solution with a volume of 2.00 L?
Answer: _______________________

Problem 4
How many grams of KCl would you need to weigh out to prepare 0.25 L of a 2.00 M KCl solution?
Answer: _______________________

Problem 5
Calculate the molarity of a 40.0 mL solution of 5.85 g NaCl.
Answer: _______________________

Problem 6
Calculate the volume in mL if you have 12.5 g of Na2CO3 from a 0.12 M solution.
Answer: _______________________

Problem 7
Calculate the volume in mL if you have 30.0 g LiOH from a 2.7 M solution.
Answer: _______________________

Problem 8
Calculate the final concentration if water is added to 0.150 L of a 6.00 M HCl solution to give a volume of 0.5 L.
Answer: _______________________

Problem 9
Calculate the final concentration if a 10.0 mL of a 2.5 M KCl solution is diluted with water to 0.25 L.
Answer: _______________________

Problem 10
Calculate the final concentration if water is added to 0.25 L of a 12.0 M KBr solution to give a volume of 1.00 L.
Answer: _______________________


© 2017 Laura Glassel – lizzietutoring.blogspot.com

New Worksheet - Chemistry - Temperature and Heat

Formulas:
˚C = 5/9 (˚F - 32)
˚F = 9/5 (˚C) + 32
K = ˚C + 273.15
1 calorie = 4.184 Joule
1 food calorie (Cal) = 1,000 chemistry calories (cal)
q = (m) (c) (ΔT)
- q object = q water + q calorimeter

Problem 1
100 g of ethanol at 25.0 degrees is heated until it reaches 50.0 degrees. The specific heat of ethanol is 2.46 J / (g)(C). How much heat does the ethanol gain?
Answer: _______________________

Problem 2
How much heat is required to raise the temperature of 789 g of liquid ammonia from 25.0 degrees C to 82.7 degrees C? The specific heat of liquid ammonia is 4.70 J / (g)(C).
Answer: _______________________

Problem 3
A solid substance has a mass of 250 g. It is cooled by 25.0 degrees C and looses 4930 J of heat. What is the specific heat?
Answer: _______________________

Problem 4
A piece of metal with a mass of 14.9 g is heated to 98.0 degrees C. When the metal is placed in 75.0 g of water at 20.0 degrees C, the temperature of the water rises by 28.5 degrees C. What is the specific heat of the metal?
Answer: _______________________

Problem 5
A piece of gold (specific heat = 0.129 J / (g)(C)) with a mass of 45.5 g and a temperature of 80.5 degrees C is dropped into 192 g of water at 15.0 degrees C. What is the final temperature of the two combined?
Answer: _______________________


© 2017 Laura Glassel – lizzietutoring.blogspot.com

New Worksheet - Chemistry - Atomic Mass

Formulas
1 amu = 1.66 x 10–24 g
g / amu = # of moles
1 mole = 6.02 x 1023

Problem 1
Write out the balanced reaction for the complete combustion of octane (C8H18).
Answer: ____________________________________________________________________________________

Problem 2
If an automobile completely combusts 7.94 grams of octane (see your reaction for #1), how many grams of carbon dioxide will be produced?
Answer: ___________________________

Problem 3
What is the mass of one KC2H3O2 molecule in amu?
Answer: ___________________________

Problem 4
Write out the balanced reaction for the formation of MgCr2O7.
Answer: ____________________________________________________________________________________

Problem 5
If in the reaction from #4 5.73 moles of Cr (chromium) are used, how many moles of MgCr2O7 will be produced?
Answer: ___________________________

Problm 6
What is the mass of one Lu atom in grams?
Answer: ___________________________


© 2017 Laura Glassel – lizzietutoring.blogspot.com

New Worksheet - Chemistry - Entropy

Problem 1
Write out the balanced equation that shows that magnesium reacts with water to form magnesium hydroxide and hydrogen.
Answer: ________________________________________________________


Problem 2
If you have 30.0 grams of carbon in one pile and 50.0 grams of carbon in the other, which sample of carbon has more entropy?
Answer: ________________


Problem 3
If a reaction has a ΔH of – 150.0 kJ / mole and is spontaneous for all temperatures less than 195 K, what is its ΔS?
Answer: ________________


Problem 4
What is the sign of ΔS for the following reaction: H2O (l) + CaO (s) → Ca(OH)2 (s)
Answer: ________________


Problem 5
If the ΔH of a certain reaction is – 1023 kJ/mole and the ΔS is – 324 Joules / (mole) (K), what is the temperature range for which this reaction is spontaneous?
Answer: ________________



© 2017 Laura Glassel – lizzietutoring.blogspot.com

New Worksheet - Chemistry - Combined Gas Law

0 ˚C = 273.15 K
P1V 1 / T 1 = P2 V2 / T2
1.000 atm = 101.3 kPa
760.0 torr = 1.000 atm
760.0 mmHg = 1.000 atm

Problem 1
A balloon is filled with air so that its volume is 5.6 L at 22.0 ˚C. It is then lowered into a vat of liquid nitrogen so that it reaches a temperature of – 185.0 ˚C. Assuming that the pressure stays constant, what is the new volume?
Answer: ________________

Problem 2
Write out the balanced equation that shows that nitrogen trihydride reacts with oxygen to form nitrogen monoxide and water.
Answer: ________________

Problem 3
A balloon is filled with helium at a temperature of 25.0 ˚C and a pressure of 755 mmHg so that its volume is 6.65 L. It then rises to an altitude where the temperature is 15.0 ˚C and the pressure is 625 mmHg. What is its volume at that altitude?
Answer: ________________

Problem 4
A chemist collects 56.7 mL of nitrogen gas at 25 ˚C and 740 torr. What would the volume be if the temperature is lowered to 273 K and the pressure is raised to 1.00 atm?
Answer: ________________

Problem 5
A chemist collects 83.2 mL of oxygen gas at 32 ˚C and 560 torr. What would the volume be if the temperature is lowered to 273 K and the pressure is raised to 1.00 atm?
Answer: ________________

Problem 6
A balloon is filled with air so that its volume is 2.7 L at 15.0 ˚C. It is then lowered into a vat of liquid nitrogen so that it reaches a temperature of – 117.0 ˚C. Assuming that the pressure stays constant, what is the new volume?
Answer: ________________

Problem 7
A chemist collects 63.2 mL of nitrogen gas at 12 ˚C and 890 torr. What would the volume be if the temperature is lowered to 251 K and the pressure is raised to 1.24 atm?
Answer: ________________

Problem 8
A balloon is filled with helium at a temperature of 22.3 ˚C and a pressure of 856 mmHg so that its volume is 7.91 L. It then rises to an altitude where the temperature is 12.9 ˚C and the pressure is 527 mmHg. What is its volume at that altitude?
Answer: ________________


© 2017 Laura Glassel – lizzietutoring.blogspot.com

New Worksheet - Geography - Latitude and Longitude

1. Name 5 cites lying near 40° north latitude.

2. Name 3 cities lying near 45° north latitude.

3. Name 4 cities lying near 35° north latitude.

4. Name 3 cities lying near 30° north latitude.

5. Define: longitude, meridian, east longitude, west longitude.

6. What points on the earth have the lowest possible longitude? Greatest possible?

7. How does the arrangement of meridians differ from that of parallels of latitude?

8. Find a place on the earth having 0° 00' 00'' latitude and 0° 00' 00'' longitude.

10. What meridian of longitude does New Kensington lie near?

11. Longitude range: Between what two meridians of longitude do the following countries lie: Alaska, United States, Brazil, Russia, SIberia, India, Dutch East Indies, Germany, and China?

12. How many degrees east of London are these cities? (use a map of Europe) Belgrade, Budapest, Hamburg, Munich, Rome, Leningrad, Archangel, Oslo, Helsingfors, and Paris?

13. Six airplanes have radioed their positions as follows. What countries are they near?

Latitude: 15° N // Longitude: 35° W // Countries: __________________________________________________

Latitude: 50° N // Longitude: 135° W // Countries: __________________________________________________

Latitude: 20° S // Longitude: 160° E // Countries: __________________________________________________

Latitude: 30° S // Longitude: 80° W // Countries: __________________________________________________

Latitude: 10° S // Longitude: 20° W // Countries: __________________________________________________

Latitude: 35° N // Longitude: 70° W // Countries: __________________________________________________

Latitude: 20° N // Longitude: 95° W // Countries: __________________________________________________

Latitude: 10° S // Longitude: 80° W // Countries: __________________________________________________


© 2017 Laura Glassel – lizzietutoring.blogspot.com