2/18/13
NO School
President's Birthday
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 4-6 (2 pts) Std: 4
2. Ch 13 Assess, p. 415 68-71 (3 pts) Std: 4
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BASKET (stamped): Journal 2/15
1. SN Ch 13.1 pages 171-174 (5 pts) Std 4
BLACK TRAY:
Mass vs Velocity of Molecules - Graham's Law LAB (10 pts)
Data gathering done last Friday.
Extra Credit Opportunity
Using Greatest Gas Sim ever
http://mrwiggersci.com/chem/Labs/Gas-Simulator-ex-cr-gas-laws.htm
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
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
35 psi
1 atm
14.7 psi
Convert to mmHg
760 mmHg
125,000 kPa
101.3 kPa
760 mmHg
Convert to Torr
1 atm
2.5 atm
760 Torr
1 atm
760 Torr
101.3 kPa
Convert to psi
550 Torr
101,325 Pa
14.7 psi
14.7 psi
760 Torr
Convert to Pa
mmHg
101,325 Pa
760 mmHg
Convert to kPa
83 Pa
101.3 kPa
101,325 Pa
760
Torr
14.7
psikP
101.3
1 atm
Dalton's Law of Partial Pressures
PT = P1 + P2 + P3 + P4 + P5 + P6 + ...
Examples:
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 1-5; Charles, p 425 6-8 (5 pts) Std 4
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BASKET (stamped): Journal 2/19
1. Ch 13.1 PP's, p. 392 4-6 (2 pts) Std: 4
2. Ch 13 Assess, p. 415 68-71 (3 pts) Std: 4
BUYBACKS
Quiz 3.2
At lunch tomorrow (Thursday)
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
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
Boyle's Law:
http://group.chem.iastate.edu/Greenbowe/sections/projectfol
der/flashfiles/gaslaw/boyles_law_graph.html
P1V1 = P2V2
Charles
V1
T1
Law:
V2
T2
http://group.chem.iastate.edu/Greenbowe/sections/projectfold
er/flashfiles/gaslaw/charles_law.html
=
temp. must be
K
degrees
2/21/2013 Standards: 4 (Gases and their Properties)
OBJECTIVES:
● Students will be able to derive Boyle, Charles, Avogadro, and
Gay-Lussac's gas laws from the combined gas law.
● Students will be able to work Gay-Lussac's and Avogadro's gas laws using the combined gas law.
DO NOW:
1. Write the formulas for solving Gay-Lussac'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 9-13 (Gay-Lussac) and p. 430 19-23 (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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BASKET (stamped): Journal 2/20
1. Ch 14.1, Boyle, p 422 1-5; Charles, p 425 6-8 (5 pts) Std 4
To see complete solutions for 6-8 (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.
For each HW problem
identify variables
as P, V, or T
p. 422 and 425
1.
kPa
Boyle
mL
2.
L
Boyle
atm
3.
mL
Boyle
atm
4.
L
Boyle
atm
atm
5.
Boyle
L
==========================================================
6.
°C
Charles
L
7.
L
Charles
°C
8.
°C
L
Charles
Combined Gas Law
P1V1
n1T1
P2V2
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.
BUYBACKS
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. 193-195 (3 pts) Std 4
2. Appendix A p. 879 8 & 9 (2 pts) Std 4
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BASKET (turned in): Journal 2/21
1. Ch 14.1 PP's p. 427 9-13 (Gay-Lussac) and p. 430 19-23 (Avogadro)
Show given, find, and calculations. Use combined gas law for both sets
not use the methods in the text!!!! (10 pts) Std 4
of problems - do
Answers:
8. 2.19 atm
9. 130 mL