3/12/2012 Standards: 4 (Gases & Their Properties)
Objectives:
● Complete Dalton's Law Lab
● Introduce PV = nRT (R = constant which = 0.0821)
DO NOW:
1. Read: Dalton's Law Lab - (computer) Std 4
2. Complete Dalton's Law lab (all calcs) (10 pts) Std 4
HOMEWORK:
1. SN Ch 14.2, p. 191-193 (2 pts) Std 4
2. Ch 14.2. PP's, p. 430 19-21 (3 pts) Std 4
==========================================================
BASKET: ● Journal 3/9
1. Gay-Lussak, p. 427 9-13 (show given, find, calcs) 3 pts Std 4
2. Boyles's Law Worksheet (handout) - Show given, find, & calcs - 5,6,7 (a&b),
9 (a&b),11 (a&b),17 (a&b),19 (a&b), and 21 (5 pts) Std 4
R = 0.0821
3/13 & 3/14/2012
Standards: 4 (Gases & Their Properties) CAHSEE
Objectives:
● Review results of Dalton's Law Lab w responder quiz
● Students will be able to decide whether to use PV = nRT or combined.
● Students will be able to use STP in calculations
DO NOW:
1. Ch 14.2, p. 430 - PP's 19-20 (be able to show given & find)
HOMEWORK:
1. Ch 14.2, p. 430 - PP's 22 & 23, p. 432 - PP's 24-28 (5 pts) Std 4
===========================================================
STAMPS: ● Journal 3/9 & 3/12 Dalton's Law Labyou may be asked to read yours
1. SN Ch 14.2, p. 191-193 (2 pts) Std 4
2. Ch 14.2. PP's, p. 430 19-21 (3 pts) Std 4
For homework turned in Monday
There were 2 assignments. The paper on top has score for both assignments:
5 pts for Boyle's Law worksheet
3 pts for Gay-Lussak problems
from book
Total = 8
Combined Gas Law
- conditions change
P1V1
n1T1
Ideal Gas Law
- only one set of conditions
PV = nRT
(R = constant which = 0.0821)
P2V2
n2T2
=
STP means
P = 1 atm
T = 0.00 deg C
Important relative:
If gas is at STP
22.4L = 1 mol
3/14/2012 Standards: 4 (Gases & Their Properties)
If you are in Periods 2 or 6, you will need to look at the whiteboard for 3/13
CAHSEE
3/15/2012 Standards: 4 (Gases & Their Properties)
Objectives:
● Comlete Mini-Lab - Disc. direct & inv. relationships P,V,n & T
● Be able to complete Boyle's Law lab on computer at home.
● Students will be able to use STP in their calculations.
● Students will be able to complete Extra Credit gas sim (see Labs) (30 pts)
DO NOW:
1.
If 852 Torr, and 85 g HCl, and 45 °C, what will the volume of
HCl gas be in the vessel? Show your calculations for each of the 3
conversions as well as using PV = nRT or Combined Gas Laws.
HOMEWORK:
1. Ch 14.3, 41-45 (5 pts) Std 4
============================================================
STAMPS: ● Journal 3/14
1. Ch 14.2, p. 430 - PP's 22 & 23, p. 432 - PP's 24-28 (5 pts) Std 4
HELP for DO NOW
Pressure must be converted to atm. , g HCl must be converted to moles,
45 °C must be converted to Kelvins, and the value of R (a constant)
is always = 0.0821. Then V will be given in L.
Notebook total is now 182 possible
Combined Gas Law
- conditions change
P1V1
n1T1
Ideal Gas Law
- only one set of conditions
PV = nRT
(R = constant which = 0.0821)
P2V2
n2T2
=
STP means
P = 1 atm
T = 0.00 deg C
Important relative:
If gas is at STP
22.4L = 1 mol
For today's quiz questions, first form groups of 4, then one person goes to get a responder to give the answers for each question and explain
why the answer is correct.
1
Why are the the pressure calculations
coming out the same for molecules of
different sizes?
A
molar mass is part of PV = nRT
B
they aren't, mass of molecule matters
C
lighter molecules hit side of container
more often than heavier molecules,
resulting in their exerting the same
amount of pressure on the inside of the
container
D
pressure of all gases is constant and doesn't
change
2
If you have 1 mol ea of 5 different
molecules, how much more pressure (P)
will the 5 exert together than only one?
A
B
2 times more P
5 times more P
C
this cannot be determined with
gas laws
D
3 times more P
3
Does the molecule mass affect the
pressure it will exert on the inside of the
vessel it is in?
Yes
No
4
Using PV = nRT, calculate the pressure
of 1 mol of CH in a vessel of 30L, at a
temp. of 100 deg C.
(R = 0.0821). Round to 3 sig. figs
5
Given the conditions shown, which
gas law will you need to use?
(problems from text)
A
B
p. 433
p. 432
Combined Gas Law
Ideal Gas Law
32, 33
Period 3 notebooks collected today
3/16/2012 Standards: 4
Period 5 and 6 notebooks collected Monday
Objectives:
● Students will be able to complete Boyle's Law gas sim questions at home.
● Students will be able to use STP in their calculations.
● Students will understand how to use the extra credit on-line gas sim. and be
able to ask questions about how to accomplish the assignment due
3/30 (2 wks from today)
DO NOW:
1.
If P = 705 Torr; V = 85 mL; T = 115 °C . Find moles of gas.
2. If the gas is methane CH4 , how many grams will that be?
HOMEWORK:
1. Ch 14.2 PP's p. 437 41-45 (10 pts) Std 4
2. Do Boyles' Law lab at home using simulator on-line. Follow directions given on
the sheet itself and instruction given in class today.
NOTE - THIS ISN'T DUE UNTIL TUESDAY! (15 pts) Std 4
==========================================================
STAMPS: ● Journal 3/15
1. Ch 14.2, p. 433 29-33 (5 pts) Std 4
STP – is code for
P = 1 atm and T = 273 K
Notebook total is now 182 possible