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WARM-UP (5 MINUTES). Review your handouts, notes and textbook (page 413-417) on Factors Affecting Gas Pressure. GET READY FOR YOUR WRITTEN QUIZ FOR LT4A (10 MINUTES). WRITTEN QUIZ (10 MINUITES). Please write your name, period and date. - PowerPoint PPT Presentation
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WARM-UP (5 MINUTES)Review your handouts, notes and
textbook (page 413-417) on Factors Affecting Gas Pressure.
GET READY FOR YOUR WRITTEN QUIZ FOR LT4A (10 MINUTES)
WRITTEN QUIZ (10 MINUITES)Please write your name, period
and date.
In the Gradecam answer form, use pencil only to write down your Student ID (5 digits) in the space provided and shade.
If can not remember your Student ID let me know. I will help you to look it up.
GAS LAWS
Take out a new note sheet for this lesson.
Remember the pressure equivalences for one atmosphere:• 101.3 kPa• 14.7 psi• 760 mm of Hg • 760 torr
Gas volume may be in any volume units: m3, L, mL, dm3, ft3, yd3, gallons, pints, quarts, etc.
Boyle’s Law
Proposed by Robert Boyle in 1662
The volume of a gas is inversely proportional to the pressure. This is a statement of Boyle’s Law.
V2 = V1P1/P2 Both volumes should be in the same units and both pressures must also. This says that if we decrease the pressure on a gas, the volume will...increase
Boyle’s Law: Pressure & Volume
Boyle’s Law Simulation
Warm-UpUse Kinetic Molecular Theory
(KMT) of gases to explain Boyle’s law
Reference Pages 385 and 418 of PHC
Team Discussion and Sharing
Use Kinetic Molecular Theory (KMT) of gases to compare and contrast Seahawks Vs Broncos play-out in the Super Bowl XLVIII
Lab ActivitiesTake out a new note sheet and
write down your name, period, date, and title.
Read the lab handout carefully and follow directions to complete the lab activities.
Experimenter(s)RecorderLab protocol manager
Homework : Lab activitiesAnswer all the post-lab questionsUse a paper graph sheet to plot a graph of
volume vs Pressure/number of books due 2/18/2014 (in class)
Use Microsoft Excel Spreadsheet to plot a graph of Pressure/number of books vs 1/volume
Due 2/17/ 2014 Attach and send to my email:
WARM-UPSUBMIT YOUR LAB HOMEWORK:
oPAPER GRAPH (VOLUME Vs PRESSURE)oANSWERS TO POST LAB QUESTIONS
ERROR ANALYSIS OF THE WRITTEN QUIZ LT4A
MAKE NOTE OF WHY YOU DIDN’T GET FULL CREDIT OF THE QUESTION
ERROR ANALYSISYour reason would probably be:Typographical errors (I knew the answer but
for some reason didn’t mark it correctly)Careless mistakes (I should have know the
answer but read the question so quickly an important word was skipped or some similar error related to work habits)
Misconception (I thought I knew the answer but was mistaken in my understanding)
Lack of knowledge (I truly did not know: sometimes phrased as “I had no clue”)
ACTION PLAN Come up with a specific plan of what you are going to
study to be well rounded on the factors affecting gas pressure and KMT of gases.
UNIT EXAM 1 DUE MONDAY 2/24/2014 (15 QUESTIONS FOR 30 MINS)
HW: UNIT 1 REVIEW : 10 MINS VIDEO CLIP WILL BE POSTED ON THURSDAY 2/20/14
LT4C LAB ACTIVITIES: HOT BALLOON DUE MONDAY 2/24/14
LT4B LAB ACTIVITIES: BOYLE’S LAW LAB EXCEL DATA/GRAPH DUE THIS MIDNIGHT
Reviewing KMT of Gases1. Gas molecules move randomly in
straight lines2. The collision of gas molecules are
perfectly elastic3. The actual volume occupied by the gas
molecules themselves is negligible4. The cohesive forces between the gas
molecules are negligible5. The temperature of the gas is a
measure of the average kinetic energy of the gas molecules.
Inverse proportions like Boyle’s Law have a graph shaped something like this:
V
PBoyle’s Law: Pressure & Volume
Clues solving Boyle’s LawA gas is involvedYou have two volumes and two
pressuresAt constant/fixed temperature All volumes units must be the sameAll pressure units must be the same
FYI:1atm=101.3kPa=760mmHg=760torr=14.7psi
Some helium gas occupies 6.1 cubic decimeters (dm3) when the pressure is 105 kPa. Find its volume if the pressure is 167 kPa (and nothing else changes). Rationale?… We know to use Boyle’s Law, since we have a gas, 2 P’s & 2 V’s.V2 = P1V1/P2 V2 = (6.1 dm3)(105 kPa)/(167 kPa)V2 = 3.8 dm3
Boyle’s Law: Pressure & Volume
Some ethane gas occupies 1.44 L when the pressure is 0.794 atm. At what pressure will it occupy 1.688 L at constant temperature? Rationale?… We know to use Boyle’s Law, since we have a gas, 2 P’s & 2 V’s.P2 = V1P1/V2
P2 = (1.44 L)(0.794 atm)/(1.688 L)P2 = 0.677 atm
Boyle’s Law: Pressure & Volume
The pressure of a gas is 44 kPa when the volume is 10. L. What is the pressure if the volume is changed to 20. L at constant temperature?. Rationale?… We know to use Boyle’s Law, since we have a gas, 2 P’s & 2 V’s.P2 = P1V1/V2 P2 = (44 kPa)(10. L)/20. L)P2 = 22 kPa
Boyle’s Law: Pressure & Volume
Some helium gas occupies 44.6 gallons at 356 mm of Hg. Find the volume of the gas at 777 mm of Hg if the temperature does not change. Rationale?… We know to use Boyle’s Law, since we have a gas, 2 P’s & 2 V’s.P1V1 = P2V2 V2 = P1V1/P2 V2 = ---------------------
(356 mm) (44.6 gal)777 mm
V2 = 20.4 galBoyle’s Law: Pressure & Volume
At 760. mm of Hg, some NO2 gas occupies 113 L. Find its volume at 1020 mm Hg and the same temperature. Rationale?… We know to use Boyle’s Law, since we have a gas, 2 P’s & 2 V’s.P1V1 = P2V2 V2 = P1V1/P2 V2 = ------------------------(760. mm) (113 L)
1020 mm
V2 = 84.2 L
Boyle’s Law: Pressure & Volume
Some helium gas occupies 64.0 m3 at 500. mm of Hg. At what pressure will it occupy 96.0 m3 if the temperature does not change. Rationale?… We know to use Boyle’s Law, since we have a gas, 2 P’s & 2 V’s.P1V1 = P2V2 P2 = P1V1/V2
P2 = -------------------
P2 = 333 mm Hg
(500. mm) 64.0 m3
96.0 m3
Some methane gas occupies 125 L at 101.5 kPa. Find its volume at 165.0 kPa if the temperature remains the same. Rationale?… We know to use Boyle’s Law, since we have a gas, 2 P’s & 2 V’s.V2 = V1P1/P2
V2 = (125 L)(101.5 kPa)/(165.0 kPa)V2 = 76.9 L
Boyle’s Law: Pressure & Volume
Some argon gas has a volume of 49.8 L at 675 torr. Find the pressure at which it will occupy 23.0 L if the temperature remains constant. Rationale?...We know to use Boyle’s Law, since we have a gas, 2 P’s & 2 V’s.P1V1 = P2V2 P2 = P1V1/V2
P2 = -----------==--------
P2 = 1460 torr
(675 torr)230 L
(49.8 L)
Some ethane gas occupies 175 L at 1.00 atmospheres. Find its volume at 3.00 atmospheres if the temperature remains the same. Rationale?… We know to use Boyle’s Law, since we have a gas, 2 P’s & 2 V’s.V2 = V1P1/P2
V2 = (175 L)(1.00 atm.)/(3.00 atm)V2 = 58.3 L
Boyle’s Law: Pressure & Volume
Some gaseous ether occupies 220. L at 1.00 atmospheres. Find its volume at 3040 mm Hg if the temperature remains the same. (Use 760 mm/atm)Rationale?… We know to use Boyle’s Law, since we have a gas, 2 P’s & 2 V’s.V2 = V1P1/P2
V2 = (220. L)(1.00 atm.)/[3040 mm/(760 mm/atm.)]V2 = 55.0 L
Boyle’s Law: Pressure & Volume