2013­02­18.notebook
February 22, 2013
2/18/13 NO School
President's Birthday
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2013­02­18.notebook
February 22, 2013
2/19/2013 Standards: 4 (Gases and their Properties)
OBJECTIVES:
● Students will be able to use Dalton's Law to calculate partial pressures.
● Students will be able to convert pressure in any unit to any other unit of pressure through guided practice DO NOW:
1. 705 Torr = ? mmHg; 3 atm = ? Pascals; 25 psi = ? atm
2. Define Dalton's Law of partial pressures (see p. 391) HOMEWORK:
1. Ch 13.1 PP's, p. 392 4­6 (2 pts) Std: 4
2. Ch 13 Assess, p. 415 68­71 (3 pts) Std: 4 =========================================================== BASKET (stamped): Journal 2/15
1. SN Ch 13.1 pages 171­174 (5 pts) Std 4
BLACK TRAY:
Mass vs Velocity of Molecules ­ Graham's Law LAB (10 pts)
Data gathering done last Friday. 2
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February 22, 2013
Extra Credit Opportunity
Using Greatest Gas Sim ever
http://mrwiggersci.com/chem/Labs/Gas­Simulator­ex­cr­gas­laws.htm
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February 22, 2013
Different units of pressure
1 atm = 760 mmHg = 760 Torr = 101.3 kPa = 101,325 Pa = 14.7 psi (see handout)
All units with their coefficients = all others
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February 22, 2013
1 atm = 760 mmHg = 760 Torr = 101.3 kPa = 101,325 Pa = 14.7 psi (see handout)
How to use these equalities to convert units of measure
Convert to atm
1 atm
35 psi
14.7 psi
Convert to mmHg
760 mmHg
101.3 kPa
125,000 kPa
Convert to Torr
760 Torr
1 atm
2.5 atm
Convert to psi
14.7 psi
550 Torr
760 Torr
760 mmHg
1 atm
760 Torr
101.3 kPa
101,325 Pa
14.7 psi
Convert to Pa
mmHg
101,325 Pa
760 mmHg
Convert to kPa
83 Pa
101.3 kPa
101,325 Pa
760 Torr
14.7 psi
101.3 kPa
1 atm
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Dalton's Law of Partial Pressures
PT = P1 + P2 + P3 + P4 + P5 + P6 + ...
Examples:
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February 22, 2013
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February 22, 2013
2/20/2013 Standards: 4 (Gases and their Properties)
OBJECTIVES:
● Students will be able to identify units of measure as P, V, n, or T
● Introduce the combined Gas Law formula
● Be able to calculate Boyles & Charles Law problems with individual
formula and Combined Gas Law formulas
DO NOW:
1. List all possible units of measure for V (volume), T (temp.), n (moles)
2. Use your handout from yesterday to figure out which gas law will need to use for each of the following and then solve for the unknown: (a) given: P1 = 700 Torr, V1 = 500 mL, V2 = 600 mL, find P2 , (b) given: T1 = 400 deg C, V2 = 550 mL, V1 = 300 mL, find T2 HOMEWORK:
1. Ch 14.1, Boyle, p 422 1­5; Charles, p 425 6­8 (5 pts) Std 4
=========================================================== BASKET (stamped): Journal 2/19
1. Ch 13.1 PP's, p. 392 4­6 (2 pts) Std: 4
2. Ch 13 Assess, p. 415 68­71 (3 pts) Std: 4 8
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February 22, 2013
BUYBACKS
Quiz 3.2
At lunch tomorrow (Thursday)
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February 22, 2013
1. List all possible units of measure for V (volume), T (temp.), n (moles)
2. Use your handout from yesterday to figure out which gas law will need to use for each of the following and then solve for the unknown: (a) given: P1 = 700 Torr, V1 = 500 mL, V2 = 600 mL, find P2 , (b) given: T1 = 400 deg C, V2 = 550 mL, V1 = 300 mL, find T2
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February 22, 2013
1. List all possible units of measure for V (volume), T (temp.), n (moles)
2. Use your handout from yesterday to figure out which gas law will need to use for each of the following and then solve for the unknown: (a) given: P1 = 700 Torr, V1 = 500 mL, V2 = 600 mL, find P2 , (b) given: T1 = 400 deg C, V2 = 550 mL, V1 = 300 mL, find T2
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February 22, 2013
Boyle's Law:
http://group.chem.iastate.edu/Greenbowe/sections/projectfolder/flashfiles/gaslaw/boyles_law_graph
.html
P1V1 = P2V2 Charles Law:
V1 V2 =
T1 T2 http://group.chem.iastate.edu/Greenbowe/sections/projectfolder/flashfiles/gaslaw/charles_law.html
temp. must be
K
degrees
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2013­02­18.notebook
February 22, 2013
2/21/2013 Standards: 4 (Gases and their Properties)
OBJECTIVES:
● Students will be able to derive Boyle, Charles, Avogadro, and Gay­Lussac's gas laws from the combined gas law.
● Students will be able to work Gay­Lussac's and Avogadro's gas laws using the combined gas law. DO NOW:
1. Write the formulas for solving Gay­Lussac's and Avogadro's gas laws.
2. Work problem #11 on p. 427 and #21 on p. 430
HOMEWORK:
1. Ch 14.1 PP's p. 427 9­13 (Gay­Lussac) and p. 430 19­23 (Avogadro)
Show given, find, and calculations. Use combined gas law for both sets of problems ­ do not use the methods in the text!!!! (10 pts) Std 4
=========================================================== BASKET (stamped): Journal 2/20
1. Ch 14.1, Boyle, p 422 1­5; Charles, p 425 6­8 (5 pts) Std 4
To see complete solutions for 6­8 (last night's problems), see link in today's HW page (third HW item, World Globe link) ­ It is fully indexed to let you view just the part you need.
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February 22, 2013
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February 22, 2013
p. 422 and 425
kPa
1.
For each HW problem
identify variables as P, V, or T
Boyle
mL
2.
L
Boyle
atm
3.
mL
Boyle
atm
4.
L
Boyle
atm
5.
atm
Boyle
L
==========================================================
6. °C
Charles
L
7.
L
Charles
°C
8. °C
Charles
L
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February 22, 2013
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February 22, 2013
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February 22, 2013
Combined Gas Law
P
P1V1 2 V2 =
n1T1 n2T2
See if you can make Boyle's Law by writing this equality and then crossing out the variables that are not part of that law.
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BUYBACKS
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February 22, 2013
2/22/2013 Standards: 4 (Gases and their Properties)
OBJECTIVES:
● Complete Dalton's Law Lab
● Introduce PV = nRT (R = constant which = 0.0821)
DO NOW:
1. Read Dalton's Law Lab (handout) silently and try to understand what you will be doing in the lab today. HOMEWORK:
1. SN Ch 14.2 p. 190, Ch 14.3 p. 193­195 (3 pts) Std 4
2. Appendix A p. 879 8 & 9 (2 pts) Std 4
=========================================================== BASKET (turned in): Journal 2/21
1. Ch 14.1 PP's p. 427 9­13 (Gay­Lussac) and p. 430 19­23 (Avogadro)
Show given, find, and calculations. Use combined gas law for both sets of problems ­ do not use the methods in the text!!!! (10 pts) Std 4
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February 22, 2013
Answers: 8. 2.19 atm
9. 130 mL
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