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 calculationsDO 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 Lab-

you 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 bookTotal = 8

PV = nRT (R = constant which = 0.0821)

P1V1 P2V2 n1T1 n2T2 =

Combined Gas Law

- conditions change

Ideal Gas Law - only one set of conditions

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) CAHSEE

If you are in Periods 2 or 6, you will need to look at the whiteboard for 3/13

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 NOWPressure 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

PV = nRT (R = constant which = 0.0821)

P1V1 P2V2 n1T1 n2T2 =

Combined Gas Law

- conditions change

Ideal Gas Law - only one set of conditions

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 2 times more P

B 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 Combined Gas Law

B Ideal Gas Law

p. 433 32, 33p. 432

3/16/2012 Standards: 4 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 42. 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 4STP – is code for P = 1 atm and T = 273 K

Period 3 notebooks collected todayPeriod 5 and 6 notebooks collected Monday

Notebook total is now 182 possible