UNIT 10 - GAS LAWS - Weebly



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UNIT 12 - GAS LAWS

|Date |Agenda |Homework |

|Wed 4/22 |Introduce gas laws - Activity Worksheet #1 |Read p 330-332 |

|PARCC | |Finish Worksheet #1, if needed |

|Thurs 4/23 |Notes - Introduce gas law relationships | |

|PARCC |Go over graphs from Activity - Introduce absolute zero | |

|Fri 4/24 |Problems |Read p 335-338 |

| |Temperature and Pressure |Worksheet #2 (P vs T) |

| |Temperature and Volume |Worksheet #3 (V vs T) |

|Mon 4/27 |Go over HW problems |Read p 333-334 |

| |Notes - Pressure and Volume |Worksheet #4 (P vs V) |

| | |Bring in a soda can for tomorrow. |

|Tues 4/28 |Go over HW problems |Study – Quiz tomorrow |

| |Lab-Applying Gas Laws |Finish Lab Explanations |

|Wed 4/29 |Review problems | |

| |Quiz - gas laws | |

| |Go over Lab (Applying Gas Laws), if time | |

|Thurs 4/30 |Notes - Combined Gas and Ideal Gas Laws |Read p 339-340  |

| | |Worksheet #5 (combined gas law) and Worksheet #6 |

|Fri 5/1 |Go over HW problems |Read p 341-343 |

| |Worksheet #7 (Review) |Worksheet #7 |

|Mon 5/4 |Go over Review Worksheet #7 |Test tomorrow |

|Tues 5/5 |Test | |

Name: ___________________________________________

Date: _______________________ Mods: _______________

Worksheet #1: Intro to Gas Laws Activity

Part 1: Define the following terms

Heat:

Temperature:

Pressure:

Volume:

Part 2: Pressure vs. Temperature

1. On your chromebook, go to the website: and click “Run Now”.

2. Under “Constant Parameter” on right side of your screen, select “Volume” to be constant.

3. Click and move the pump handle up and down four times to put gas into the chamber.

4. In the “Heat Control” box, “Add” heat and record the temperature and pressure at five increasing heat intervals.

|Temperature (K) |Pressure (atm) |

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5. Plot a graph of the data and extrapolate temperature to pressure equals zero.

6. Discuss the relationship between pressure and temperature.

Part 3: Temperature vs. Volume

1. Open up the following website:

2. Click on “show data table”

3. Move temperature scroll bar to 200 K and the computer will record the volume

4. Increase the temperature by 10 K increments and record the volume. Continue until you reach 300 K

|Temperature (K) |Volume (cm3) |

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5. Plot a graph of the data and extrapolate temperature to volume equals zero.

6. Discuss the relationship between volume and temperature.

Part 4: Pressure vs. Volume

1. Open the following website:

2. Move syringe to about 30 ml and the computer will record the pressure

3. Decrease the volume by about 5 ml and record the pressure.

4. Continue decreasing the volume until you reach about 10 ml

|Volume (ml) |Pressure (psi) |

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5. Plot a graph of the data

5. Discuss the relationship between volume and pressure.

Worksheet #2

Pressure vs. Temperature

1. The relationship between pressure and temperature is:

2. The formula for converting oC to K is:

3. A gas with a pressure of 5.4 atm and at 25oC is raised to a new temperature of 78oC. What is the new pressure?

4. A gas with a pressure of 7.5 atm and at 30oC is raised to a new temperature of 150oC. What is the new pressure?

5. A gas with a pressure of 550 torr and at 110oC is raised to a new pressure of 760 torr. What is the new temperature?

6. A gas with a pressure of 780 torr and at 55oC is lowered to a new pressure of 640 torr. What is the new temperature?

7. A gas with a pressure of 5.6 atm and at 150oC is lowered to a new temperature of 20oC. What is the new pressure?

8. A gas with a pressure of 560 torr and at 125oC is lowered to a new temperature of 74oC. What is the new pressure?

Worksheet #3

Volume vs. Temperature

1. The relationship between volume and temperature is:

2. The formula for converting oC to K is:

3. A gas at 5oC occupies a volume of 7.5 liters. What volume will the gas occupy at 100oC?

4. A gas at –20oC occupies a volume of 35.0 liters. What volume will the gas occupy at 20oC?

5. A gas at 200 K occupies a volume of 350 mL. What temperature is needed to increase the volume to 500 mL?

6. A gas fills a balloon and occupies a volume of 22.4 L at a temperature of 27oC. What would the new volume of the balloon be if the gas were heated to 127oC?

7. A gas occupies a volume of 30.0 cm3 at 73.5oC. If the pressure is held constant and the temperature is changed to 22.5oC, what will the new volume be?

8. A sample of argon gas is heated and its volume went from 2.3 L to 3.8 L. If its final temperature was 45oC, what as the original temperature?

Worksheet #4

PRESSURE VOLUME PROBLEMS

1. What is the relationship between pressure and volume?

2. If the volume is 450 mL and the pressure is 5.6 kPa and the pressure is raised to 7.8 kPa, what is the new volume?

3. The pressure is 765 torr and the volume is 4.5 L. The volume is decreased to 2.3 L, what is the new pressure.

4. The volume is 560 mL and the pressure is 5 atm. The pressure is raised to 8 atm, what is the new volume?

5. The volume of a gas is 3.4 L and the pressure is 850 torr. The pressure is lowered to 740 torr. What is the new volume?

6. The volume of a gas is 22.4 L at 1 atm. The pressure is lowered to .50 atm. What is the new volume?

LAB

APPLYING GAS LAWS

Air Pressure vs. Gravity

1. Pour water into a small juice cup until it overflows

2. Place a index card over the mouth of the cup

3. Invert the cup over the sink

4. Remove your hand from the card

5. Explain below:

Cartesian Diver

1. Add water up to the top of an empty water bottle

2. Fill a small test tube about half full with water

3. Invert the test tube and drop it into the bottle. If the test tube sinks, start over with less water in the test tube.

4. Fill the bottle to overflowing with water and place the top on

5. Squeeze the bottle and watch the air bubble in the test tube

6. Explain (below) using gas laws

Balloons

1. Add a small amount of water to the bottom of a flask

2. Place the flask on the burned and boil the water for several minutes

3. Carefully, place a balloon over the mouth of the flask

4. Remove the flask from the burner

5. Explain using gas laws

Soda Cans

1. Add a small amount of water to a soda can.

2. Place the can on the burner and boil the water for several minute

3. Quickly invert the can in a bucket of cold water

4. Explain using gas laws

Worksheet #5

Combined Gas Law

1. 4.5 L of Carbon dioxide at 23oC has a pressure of 3.2 atms. What is the pressure of the carbon dioxide at 950C and 3.4 L?

2. 7.6 L of nitrogen at 146oC has a pressure of 755 torr. What is the pressure of the nitrogen at 57oC and 10.5 L?

3. Oxygen at 25oC and 760 torr pressure occupies a volume of 21.2 L. What is the volume of oxygen gas at 133oC and 830 torr?

4. 4.3 L of methane at 5.4 kPa has a temperature of 46oC. What is the temperature of methane at 5.4 L at 6.6 kPa?

Worksheet #6

IDEAL GAS LAW

SHOW ALL WORK!!

1. What pressure is exerted by 0.622 moles of gas contained in a 9.22 L vessel at 16 C?

P=

V=

n=

R=

T=

2. How many moles of gas occupy a 4.86 L flask at 11 C and 66.7 kPa pressure?

P=

V=

n=

R=

T=

3. What volume is occupied by .684 mol of gas at 800 mmHg and 9 C?

P=

V=

n=

R=

T=

4. At what temperature is a gas if 0.0851 mol of it is contained in a 604-dm3 vessel at 25 atm?

P=

V=

n=

R=

T=

5. What pressure is exerted by 0.00306 mol of gas in a 25.9-cm3 container at –25 C?

P=

V=

n=

R=

T=

Worksheet #7

Review Gas Laws

1. A gas occupies a volume of 30.0 cm3 at 73.5oC. If the pressure is held constant and the temperature is changed to 22.5oC, what will the new volume be?

2. A gas exerts a pressure of 730 mm Hg at -25.5oC. If the volume is held constant, what will the new temperature be at standard pressure?

3. A gas in a 5.2 L container exerts a pressure of 0.25 atm. If the temperature is held constant, what will the new volume be at standard pressure?

4. Fluorine gas exerts a pressure of 800 torr. When the pressure is changed to 700 torr, its volume is 3.0 L. What was the original volume?

5. A 22.4 dm3 balloon is at –20oC and 500 torr. If the balloon rises into the atmosphere, the temperature and pressure will change to STP. What will be the new volume of the balloon?

6. A chemist collects 372 cm3 of gas over water at 25oC and 111.0 kPa. What volume would the dry gas occupy at 2oC and 98.0 kPa. (Water vapor pressure at 25 o C is 3.2 kPa)

7. How many moles of oxygen gas occupy a 0.486 L flask at 11oC and 66.7 kPa? How many grams of oxygen gas do you have?

8. A 10.0 L sample of oxygen gas exerts a pressure of 103 kPa at standard temperature. What is the mass of the oxygen gas?

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