3/4/2013 Standards: 4 (Gases and their Properties) OBJECTIVES: ● Prepare for Quiz 3.3 (Ch 13.1 & 14), doing HW in class ● Use responder questions to review for Quiz 3.3. DO NOW: 1. If P = 705 Torr; V = 85 mL; T = 115 °C. Find moles of gas. 2. If the gas is methane CH 4, how many grams will that be? HOMEWORK: 1. Std Test Pract p (a), 7 (c), 8 (d), 9 (c), & 10 (a) (5 pts) Std 4 2. Help Sheet - 1/2 sheet 8.5 x 11" paper, one side only. Name, 3/5/13, and period in top right corner as paper looks wider than tall. Recommended info: combined gas law, PV = nRT (R = and req'd units for each variable), 22.4 L = 1 mol of any gas at STP, what STP means. Dalton's Law ======================================================= next page for stamping With all the stuff we had to do toda y and a mini mu m day sche dule, no time for quiz zes or resp onde rs. Trie d to do too muc h.

BASKET (stamped): Journal 3/1 1. Ch 14 Assess p ( atm; K; c. 510 mmHg; d atm), 90 (1.17 atm), 92 (74.8 kPa), 94 (5.91 x 10 4 L), 96 (34 L), 98 (2.93 g/L) (5 pts) Std 4 2. Std Test Pract p (5 pts) Std 4 BLACK TRAY: Boyle's Law Lab - (15 pts) Std 4

Period 2 only Student Paths - Complete survey card and return tomorrow (5 pt assignment)

3/5/2013 Standards: 4 (Gases and their Properties) OBJECTIVES: ● Prepare for Quiz 3.3 (Ch 13.1 & 14), with responder questions. DO NOW: 1. If P = 2.70 kPa; V = 7.50 L; T = 15.0 °C. Find moles of gas. 2. If the gas in #1 above is Ar, how many grams will that be? HOMEWORK: 1. Study for Quiz 3.3, coming tomorrow Wed 3/6 ======================================================= BASKET (stamped): Journal 3/4 1. Std Test Pract p (a), 7 (c), 8 (d), 9 (c), & 10 (a) (5 pts) Std 4 BLACK TRAY: Extra Credit (from Practice Quiz 3.3) (double credit) Help Sheet - STAMPED AT YOUR DESK RESPONDERS TOMORROW Go od less on pla n - wor ked well for full peri od. Ho wev er only got to res pon der que stio n 4 mo st clas ses

Announcements: 1. Ch 14 Quiz 3.3 coming tomorrow Wed 3/6 (60 pts) 2. Mem Ions 4 (4th time) Fri 3/ (40 pts) 3. Labs (all of them for Ch 13 & 14) WILL NOT BE EXCUSED - MUST BE MADE UP BY Friday 3/8 4. Extra Credit - Practice Quiz 3.3 (Ch 13.1, ). Still available. One pt ex cr for each 4 problems worked out. a. calculation problems: given, find, calculation, and correct answer circled. b. non-calculation problems: copy complete question, show correct answer (written out, not just the letter). Show page # from text where the answer could be explained from, and a complete explanation as to what is on that page to help and why it works.

Review P1V1n1T1P1V1n1T1 P2V2n2T2P2V2n2T2 = PV = nRT P any unit OK V any unit OK n any unit OK T only K units must be same on ea. side P atm only V L only n mol only R = T K only 22.4 L = 1 STP Ideal Gas Law Combined gas law P T = P 1 + P 2 + P P n Dalton's Law all variables must be the same unit of measure can use instead of PV = nRT IF This slide was an excel lent revie w. Rate A Rate B = Molar mass B Molar mass A Graham's Law of Effusion / Diffusion

For today's quiz questions, all students have responders where they respond to each question. Individuals will be called on to explain why correct, for ex cr for their group.

1Why 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

2If 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 Which law is used to solve the above problem? A. Boyle's Law B. Dalton's Law C. Charles' Law D. Combined Gas Law E. PV = nRT F. Gay-Lussac's Law

3Does the molecule mass affect the pressure it will exert on the inside of the vessel it is in? Yes No

4Calculate the pressure, if 1.50 mol of CH 4 in a vessel of 30.0 L, at a temp. of 100. °C. Round to 3 sig. figs (no spaces & enter unit of measure) Given:Find: n = 1.50 molP = ? V = 30.0 L T = 100. °C = 373 K PV = nRT P (30.0 L) = (1.50 mol) x (0.0821) x (373 K) (1.50 mol) x (0.0821) x (373 K) (30.0 L) P = P = 153 atm

5Given the conditions shown, which gas law will you need to use? (problems from text) A Combined Gas Law B Ideal Gas Law p , 33 p. 432 p a-d p

3/6/2013 Standards: 4 (Gases and their Properties) OBJECTIVES: ● Check for understanding of Ch 13 & 14 with Quiz 3.3. DO NOW: 1. Clear desk and floor of everything except: Help Sheet, scratch paper, eraser, pencil, calculator. HOMEWORK: 1. SN Ch 15.1 p (5 pts) Std 6 ======================================================= BASKET (Turned in): 1. Pract Quiz 3.3

Put papers into 5 stacks Help Sheets scratch The following in order with smallest # on top: quizzes scantron charts Spread so #'s show

3/7/2013 Standards: 6 (Solutions) Objectives: ● Students will be able to solve Henry's Law Problems for HW ● Demo - gas solubility & HOW EQUILIBRIUM is reached (demo). DO NOW: 1. define Henry's Law (equation) and what S & P mean 2. List the 3 factors for each that affect rate of (a) solvation & (b) solubility? (total of 6 factors) (see p. 456 & 458) HOMEWORK:b 1. Ch 15.1, Practice Prob, p , Assess. 3 & 5 (2 pts) Std 6 2. Ch 15 Assess, p (3 pts) Std 6 ========================================================= STAMPS: ● Journal 3/5 (day before Quiz 3.3, working on Quiz Review) 1. SN Ch 15.1 p (5 pts) Std 6 show examp le first shake clear soft drink bottle

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Henry's Law allows chemists to figure out how much CO 2 can be dissolved in water H 2 O (l) + CO 2 (g) H 2 CO 3 (aq) H 1+ (aq) + HCO 3 1- (aq) Higher Pressure MORE SOLUBILITY ==== > directly proportional P & S

Henry's Law S 1 S 2 P 1 P 2 = S = solubility (g/L) pressure (any unit OK) P = directly proportional P & S

Example Problem - Henry's Law

3/8/2013 Standards: 6 (Solutions) Objectives: ● Check for understanding Mem Ions Quiz 4 (4 x) ● Student will be able to do simple percent by mass problems. DO NOW: 1. Given 3.00 mol CO 2, in L H 2 O, at 705 Torr, What will the new pressure be when an additional 8.75 mol CO 2 is added to the vessel? (Henry’s Law) Ans: 2760 Torr (Hint: mol/L works for S) 2. p. 463 #8 (this is percent by mass – see top of p. 463) Ans: 3% (show how to get here) HOMEWORK: 1. App A, p (1 pt) Std 6 2. Ch 15.2 p PP's (4 pts) Std 6 3. HANDOUT TODAY - What Are Solutions - Tutorial Ch 15.1 Std 6 =========================================================== STAMPS: ● Journal 3/7 1. Ch 15.1, Practice Prob, p , Assess. 3 & 5 (2 pts) Std 6 2. Ch 15 Assess, p (3 pts) Std 6

Let's do this again next week.

1. Given 3.00 mol CO 2, in L H 2 O, at 705 Torr, What will the new pressure be when an additional 8.75 mol CO 2 is added to the vessel? (Henry’s Law) Ans: 2760 Torr (Hint: mol/L works for S)

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

ctfolder/ flashfiles/thermochem/solutionSalt.html SOLVATION ANIMATION 1. agitation 2. increase surface area 3. temperature Dem o - see vide o mad e in class yest erda y

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)

m = (milli-) = How to derive equality with prefixes What is 1 mL equal to in terms of L ? mL = L x x mL = L x x 1000 mL = 1 L mL = L

k = (kilo-) = kg = 1000 g How to derive equality with prefixes What is 1 kg equal to in terms of g ?

Summary Find value of prefix Substitute the value of the prefix

6What is the value of S if 25.0 g of gas is dissolved in 1.00 L of water? Number only 3 sig figs only no units of measure

7What is the solubility of a gas if 25.0 g of the gas will dissolve in 1.00 L of water. Number only 3 sig figs only no units of measure

p. 463 possible solutes: a. salt (NaCl) b. sugar (sucrose) c. MgCl 2 d. C (smaller portion of steel) e. paint pigments possible solvents: f. water g. iron (Fe major portion of steel) h. laquer thinner `

8Connect 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

9What 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 figs no units of measure do 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 figs no units of measure use % at end of #

First Problem: MASS OF SOLUTION = 13.0 g (solute) g (solvent) g (solution) Second Problem: MASS OF SOLUTION = 5.0 g (solute) g (solvent) g (solution) 10Answer?Answer?