## Chem Lab C

kenniky
Member
Posts: 283
Joined: January 21st, 2016, 6:16 pm
State: MA
Location: ABRHS --> UMichigan

### Re: Chem Lab C

correct, you can ask a question now
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Member
Posts: 66
Joined: January 6th, 2017, 4:51 pm
State: PA
Location: Swarthmore College

### Re: Chem Lab C

Alrighty, here's one.

5 mole samples of CO2, H2O(vapor), Ne, and CH4 are placed in separate, identical 10L cylinders at 25 °C.
a. What pressure, in mm Hg, would be generated? Assume near-ideal behavior.
b. If all of the samples were to be combined into one 20 L container, what pressure would that container be?
c. Holes are punctured in the ends of each of the identical cylinders so as to allow each of the gases to diffuse. From least to greatest, list the relative amount of time that it would take each gas to diffuse.
Lower Merion 2017
Subtitled: Revenge of the Non-Harriton

Placement Record:

Code: Islip | Conestoga | Tiger | Regionals | States
Out of: 61 | 42 | 36 | 37 | 36

Chemistry Lab: 9 | - | - | 4 | 4
Astronomy: 14 | - | 5 | 10 | 3
Material Science: 12 | 19 | 9 | 5 | 9
Optics: 14 | 7 | 3 | 4 | 2

kenniky
Member
Posts: 283
Joined: January 21st, 2016, 6:16 pm
State: MA
Location: ABRHS --> UMichigan

### Re: Chem Lab C

Alrighty, here's one.

5 mole samples of CO2, H2O(vapor), Ne, and CH4 are placed in separate, identical 10L cylinders at 25 °C.
a. What pressure, in mm Hg, would be generated? Assume near-ideal behavior.
b. If all of the samples were to be combined into one 20 L container, what pressure would that container be?
c. Holes are punctured in the ends of each of the identical cylinders so as to allow each of the gases to diffuse. From least to greatest, list the relative amount of time that it would take each gas to diffuse.
Automated Event Assigner!
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Member
Posts: 66
Joined: January 6th, 2017, 4:51 pm
State: PA
Location: Swarthmore College

### Re: Chem Lab C

Alrighty, here's one.

5 mole samples of CO2, H2O(vapor), Ne, and CH4 are placed in separate, identical 10L cylinders at 25 °C.
a. What pressure, in mm Hg, would be generated? Assume near-ideal behavior.
b. If all of the samples were to be combined into one 20 L container, what pressure would that container be?
c. Holes are punctured in the ends of each of the identical cylinders so as to allow each of the gases to diffuse. From least to greatest, list the relative amount of time that it would take each gas to diffuse.
Lower Merion 2017
Subtitled: Revenge of the Non-Harriton

Placement Record:

Code: Islip | Conestoga | Tiger | Regionals | States
Out of: 61 | 42 | 36 | 37 | 36

Chemistry Lab: 9 | - | - | 4 | 4
Astronomy: 14 | - | 5 | 10 | 3
Material Science: 12 | 19 | 9 | 5 | 9
Optics: 14 | 7 | 3 | 4 | 2

kenniky
Member
Posts: 283
Joined: January 21st, 2016, 6:16 pm
State: MA
Location: ABRHS --> UMichigan

### Re: Chem Lab C

15g of CaCl2 is added to 100 mL of water. What is the resultant boiling point of the water? (assume standard conditions)
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Member
Posts: 66
Joined: January 6th, 2017, 4:51 pm
State: PA
Location: Swarthmore College

### Re: Chem Lab C

15g of CaCl2 is added to 100 mL of water. What is the resultant boiling point of the water? (assume standard conditions)
On wow, forgot this could be on here. Glad to see this before anything important.

Fortunately I still think I know the equation
Lower Merion 2017
Subtitled: Revenge of the Non-Harriton

Placement Record:

Code: Islip | Conestoga | Tiger | Regionals | States
Out of: 61 | 42 | 36 | 37 | 36

Chemistry Lab: 9 | - | - | 4 | 4
Astronomy: 14 | - | 5 | 10 | 3
Material Science: 12 | 19 | 9 | 5 | 9
Optics: 14 | 7 | 3 | 4 | 2

kenniky
Member
Posts: 283
Joined: January 21st, 2016, 6:16 pm
State: MA
Location: ABRHS --> UMichigan

### Re: Chem Lab C

15g of CaCl2 is added to 100 mL of water. What is the resultant boiling point of the water? (assume standard conditions)
On wow, forgot this could be on here. Glad to see this before anything important.

Fortunately I still think I know the equation
Incorrect, check your equation again (I'm pretty sure I know where you went wrong)
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Piggy
Member
Posts: 24
Joined: August 4th, 2015, 11:43 am
Division: C
State: NY

### Re: Chem Lab C

15g of CaCl2 is added to 100 mL of water. What is the resultant boiling point of the water? (assume standard conditions)
.

kenniky
Member
Posts: 283
Joined: January 21st, 2016, 6:16 pm
State: MA
Location: ABRHS --> UMichigan

### Re: Chem Lab C

15g of CaCl2 is added to 100 mL of water. What is the resultant boiling point of the water? (assume standard conditions)
.
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Piggy
Member
Posts: 24
Joined: August 4th, 2015, 11:43 am
Division: C
State: NY

### Re: Chem Lab C

An apparatus contains Br2(g) in a solution. What happens to the vapor pressure when the piston lowers and decreases the volume of Br2(g) above the solution by half? (Assume no temperature change).

Member
Posts: 66
Joined: January 6th, 2017, 4:51 pm
State: PA
Location: Swarthmore College

### Re: Chem Lab C

An apparatus contains Br2(g) in a solution. What happens to the vapor pressure when the piston lowers and decreases the volume of Br2(g) above the solution by half? (Assume no temperature change).
Attempt
Lower Merion 2017
Subtitled: Revenge of the Non-Harriton

Placement Record:

Code: Islip | Conestoga | Tiger | Regionals | States
Out of: 61 | 42 | 36 | 37 | 36

Chemistry Lab: 9 | - | - | 4 | 4
Astronomy: 14 | - | 5 | 10 | 3
Material Science: 12 | 19 | 9 | 5 | 9
Optics: 14 | 7 | 3 | 4 | 2

Piggy
Member
Posts: 24
Joined: August 4th, 2015, 11:43 am
Division: C
State: NY

### Re: Chem Lab C

An apparatus contains Br2(g) in a solution. What happens to the vapor pressure when the piston lowers and decreases the volume of Br2(g) above the solution by half? (Assume no temperature change).
Attempt
Incorrect.
Should I give the answer now or wait?

Member
Posts: 66
Joined: January 6th, 2017, 4:51 pm
State: PA
Location: Swarthmore College

### Re: Chem Lab C

An apparatus contains Br2(g) in a solution. What happens to the vapor pressure when the piston lowers and decreases the volume of Br2(g) above the solution by half? (Assume no temperature change).
Attempt
Incorrect.
Should I give the answer now or wait?
Actually, I think I figured out my issue.
I think so at least
Lower Merion 2017
Subtitled: Revenge of the Non-Harriton

Placement Record:

Code: Islip | Conestoga | Tiger | Regionals | States
Out of: 61 | 42 | 36 | 37 | 36

Chemistry Lab: 9 | - | - | 4 | 4
Astronomy: 14 | - | 5 | 10 | 3
Material Science: 12 | 19 | 9 | 5 | 9
Optics: 14 | 7 | 3 | 4 | 2

Piggy
Member
Posts: 24
Joined: August 4th, 2015, 11:43 am
Division: C
State: NY

### Re: Chem Lab C

Attempt
Incorrect.
Should I give the answer now or wait?
Actually, I think I figured out my issue.
I think so at least

Member
Posts: 66
Joined: January 6th, 2017, 4:51 pm
State: PA
Location: Swarthmore College

### Re: Chem Lab C

According to the second law of thermodynamics, entropy must always increase. How is it, then, that it is possible for water to freeze and become ice? Justify your response using both an equation and a direct reference to the second law of thermodynamics.
Lower Merion 2017
Subtitled: Revenge of the Non-Harriton

Placement Record:

Code: Islip | Conestoga | Tiger | Regionals | States
Out of: 61 | 42 | 36 | 37 | 36

Chemistry Lab: 9 | - | - | 4 | 4
Astronomy: 14 | - | 5 | 10 | 3
Material Science: 12 | 19 | 9 | 5 | 9
Optics: 14 | 7 | 3 | 4 | 2