3/26/2012 standards : 6 (solutions) o bjectives :

3/26/2012 Standards: 6 (Solutions)Objectives:  ● Demo - gas solubility & HOW EQUILIBRIUM is reached (demo).  ● Start CST Rev w Responder Quiz (Q's 1-5) DO NOW: 1. define Henry's Law and what S & P mean show example first

2. p. 461 PP #1 solve the problem and identify the unit of measure for S.HOMEWORK: 1. Ch 15.1, Practice Prob, p. 461   1-2, Assess. 3-5 (2 pts) Std 6 2. Ch 15 Assess, p. 484   64-68 (3 pts) Std 6=========================================================STAMPS: ●  Journal 3/22 (day before Quiz 3.3, working on Quiz Review) 1. SN Ch 15.1   p. 199-203 (5 pts) Std 6

RESPONDERS

Henry's Law

S1 S2 P1 P2

=

S =

solubilitypressure

P =

http://group.chem.iastate.edu/Greenbowe/sections/projectfolder/flashfiles/thermochem/solutionSalt.html

SOLVATION ANIMATION

Example Problem - Henry's Law

3/27/2012 Standards: 6 (Solutions) Objectives:● Students will be able to calculate Henry's Law Problems ● Student will be able to do simple percent by mass problems.● CST review - Responder Quiz (Q's 6-10) DO NOW: 1. Given 3.00 mol CO2 , in 11.50 L H2O, at 705 Torr, What will the new

pressure be when an additional 8.75 mol CO2 is added to the vessel? (Henry’s Law) Ans: 2760 Torr

2. p. 463 #8 (this is percent by mass – see top of p. 463) Ans: 3% (show how to get here)

HOMEWORK: 1. Ch 15.1 Assess, p. 461 6-7 (1 pts) Std 6 2. Solving Probs: A Chem Hndbk, p. 148-150  1 (a-e), 2, 3

(see handout – 2 pts) Std 6 3. App A, p. 880   1-2 (1 pt) Std 6 4. HANDOUT TODAY - What Are Solutions - Tutorial Ch 15.1 Std 6===========================================================STAMPS:   ●  Journal 3/261. Ch 15.1, Practice Prob, p. 461   1-2 (1 pts) Std 62. Ch 15 Assess, p. 484   64-68 (3 pts) Std 63. Ch 15.1 Assess, p. 461   3-5 n (1 pts) Std 6

RESPONDERS

STAMPS:   ●  Journal 3/261. Ch 15.1, Practice Prob, p. 461   1-2 (1 pts) Std 62. Ch 15 Assess, p. 484   64-68 (3 pts) Std 63. Ch 15.1 Assess, p. 461   3-5 n (1 pts) Std 6

Units of measure in Henry's Law

S (solubility)g/L g/mL mol/L mol/mL (or any unit of volume besides L or mL)

P (pressure)atm, mmHg, Torr, kPa, Pa, psi

(any unit of pressure is OK)

1 What is the value of S if 25.0 g of gas is dissolved in 1.00 L of water?

Number only3 sig figs onlyno units of

measure

2 What is the solubility of a gas if 25.0 g of the gas will dissolve in 1.00 L of water.

Number only3 sig figs onlyno units of

measure

p. 463

possible solutes: a. salt (NaCl)b. sugar (sucrose)c. MgCl2 d. C (smaller portion of steel)e. paint pigments

possible solvents:f. waterg. iron (Fe major portion of steel)h. laquer thinner

`

3 Connect possible solutes to possible solvents

A salt

B sugar

C MgCl2

D C

E paint pigments (can pour down sink)

(cannot poud down sink)

F water

G iron

H lacquer thinner

4 What is the percent by mass of salt in a solution that contains 13.0 g of salt (solute) in 52 g of water (solvent)?

3 sig figsno units of measuredo not use %

at end of #

What is the percent by mass of salt in a solution that contains 5.0 g of salt (solute) in 25 g of water (solvent)?

3 sig figsno units of measureuse % at end of #

First Problem:

MASS OF SOLUTION = 13.0 g (solute)+ 52.0 g (solvent)------------- 65.0 g (solution)

Second Problem:

MASS OF SOLUTION = 5.0 g (solute)+ 25.0 g (solvent)------------- 30.0 g (solution)

5 Answer?

3/28/2012 Standards: 4 (Solutions) Objectives:●  Prep for CST - Responder Quiz (q's 6-10 & 11-15)●  Students will be able to do calculations of % by mass and % by volume.DO NOW: 1. If mass of solute = 3.5 g and mass of solvent = 188 g, what is the mass

percent of the solute in this solution? HOMEWORK: 1. Ch 15.2 PP's, p. 463-464   8-13 Ch 15 Assess p. 484   69-75 (both together = 4 pts) Std 6 2. PRINT Tutorial Ch 15.2-15.3 (1 pts) Std 6 -

Will help you with your HW tomorrow night !!!!!!!!!===========================================================STAMPS: Journal 3/27 STAPLE THESE TOGETHER IN ORDER if you used 2 OR MORE papers1. Ch 15.1 Assess, p. 461 6-7 (1 pts) Std 62. App A, p. 880   1-2 (1 pt) Std 63. Solving Probs: A Chem Hndbk, p. 148-150   1 (a-e), 2, 3 (2 pts) Std 6

RESPONDERS

Memorize ionsDefinitely on for tomorrow

http://www.youtube.com/watch?v=Yxk3OZWq9Ls&annotation_id=annotation_561503&feature=iv

Nurd Rage - How to make "Hot Ice"

http://mrwiggersci.com/chem/labdemopics/Supersaturated-salt-solution-and-others.htm

Extra Credit - make Hot Ice - directions and lots of assistance for how to, and what it does.

Shortest demo of Hot Ice - however, it uses commercially prepared sodium acetate.

http://www.youtube.com/watch?v=aC-KOYQsIvU&NR=1&feature=fvwp

6 What is the percent by mass of salt in a solution that contains 13.0 g of salt (solute) in 52 g of water (solvent)?

3 sig figsno units of measuredo not use % at end of #

What is the percent by mass of salt in a solution that contains 5.0 g of salt (solute) in 25 g of water (solvent)?

3 sig figsno units of measuredo not use % at end of #

First Problem:

MASS OF SOLUTION = 13.0 g (solute)+ 52.0 g (solvent)------------- 65.0 g (solution)

Second Problem:

MASS OF SOLUTION = 5.0 g (solute)+ 25.0 g (solvent)------------- 30.0 g (solution)

7 Answer?

Page 464

Same as percent by mass, except we use volume:

volume Solute + volume Solvent = volume Solution

8 What is the percent by volume of a solution made from 7.00 mL of methanol dissolved in 56.0 mL of water?

3 sig figsno units of measuredo not use % at end of #

3/29/2012 Standards: 6 (solutions)Objectives:●  Check for understanding of ions & acids names and formulas.● Students will understand how to use M (molarity) in calculationsDO NOW: 1. Define – first ionization energy (Ch 6.3) and decide which letter represents

Alkali Metals and why. 2. When a metal is heated in a flame, the flame has a distinctive color.

This information allows us to identify the elements present in stars because (see Ch 5.1 & p. 143): Why?

HOMEWORK: 1. Ch 15.2 PP's, p. 465-466  14-20 , Ch 15 Assess, p. 485  76-77 (4pts) Std: 6 2. PRINT Mass % & Molarity Lab (1 pts) Std 6 Check HW page on-line for 3 videos and Ex Cr opty============================================================STAMPS:   ●  Journal 3/281. Ch 15.2 PP's, p. 463-464   8-13 Ch 15 Assess p. 484   69-75 (4 pts) Std 62. PRINT Tutorial Ch 15.2-15.3 (1 pts) Std 6

RESPONDERS

9 Answer re Mem Ions Quiz 4?

A

B

Plan A - Take the results of this quiz and record as 45 pts

Plan B - Today's quiz is 5 pts only. We take this same quiz again next week, and then record it was 45 pts. You won't know what day, but I promise it will be Mon, Tu, or Wed.

30 pts possible on Extra Credit Gas Simulator.

This is due tomorrow.

M

Molarity

Molarity

Molarity

Molarity

Molarity

Molarity

Molarity

Molarity

Molarity

Molarity

Molarity

Molarity

Molarity

Molarity

Molarity

Molarity

Molarity

MolarityMolarity

Molarity

Molarity

Molarity

Molarity

Molarity

Molarity

Molarity

Molarity

Molarity

Molarity

Molarity

Molarity

Mola

rity

Mola

rity

M =

mol L

molarity

molarity

solute

solution

Calculate the molarity of a solution having 15.0 g NaCl in 2.80 L of water (volume of solution is still 2.80 L).

Molar mass Cl = 35.5Molar mass Na = 23.0

In your answer, use 3 sig. figs and do not use any units of measure. NUMBER ONLY

10

If time, show animation of prep of molar solutions

http://www.mhhe.com/physsci/chemistry/animations/chang_7e_esp/crm3s1_2.swf

Use this animation as future HW assignment where students work with each animation until they get it right and then record order of each operation.

3/30/2012 Standards: 6 Objectives:●  Complete data gathering before end of classDO NOW: READ LAB SILENTLY AND try to figure out your procedure.HOMEWORK: p. 468-470 21-23, 28, 30, 32, p. 485 78-82 (5 pts) ===========================================================STAMPS:   ●  Journal NONE TODAY 1. PRINT Mass % & Molarity Lab (1 pts) Std 6BASKET: p. 465-466 14-20

BLACK TRAY: Gas Simulator Ex. Cr (30 pts possible) REMOVE PAGES 1-3 OF THIS EXTRA CREDIT

(for this lab, assume vol = 20.00mL)

1.000 g = 1.000 mL (only for water)

mass % =

g soluteg solution x 100

M = (molarity)

mol (solute) L (solution)

When you come to me to get your salt, you will need to show me these masses:

1. filter paper2. graduated cylinder3. 50 mL beaker

All masses must have 3 decimals Examples: 0.l56 g

0.033 g3.427 g

Gp #

g NaCl g H20 g soln Mass % M

1

2

3

4

5

6

7

8

9

Mass % & Molarity LAB - RESULTS BY GROUPPer 1

Gp #

gNaCl g H20 g soln Mass % M

1

2

3

4

5

6

7

8

9

Mass % & Molarity LAB - RESULTS BY GROUPPer 2

Gp #

gNaCl g H20 g soln Mass % M

1

2

3

4

5

6

7

8

9

Mass % & Molarity LAB - RESULTS BY GROUPPer 3

Gp #

gNaCl g H20 g soln Mass % M

1

2

3

4

5

6

8

9

Mass % & Molarity LAB - RESULTS BY GROUPPer 5

Gp #

gNaCl g H20 g soln Mass % M

1

2

3

4

5

6

7

8

9

Mass % & Molarity LAB - RESULTS BY GROUPPer 6

Gp #

gNaCl g H20 g soln Mass % M

1

2

3

4

5

6

7

8

9

Mass % & Molarity LAB - RESULTS BY GROUPPer