week 33 chemistry
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Week 33 Chemistry. Gas Laws. Write the Learning Target. Warm Up: 4 Minutes. Stay in your own seat. You should be working SILENTLY. - PowerPoint PPT PresentationTRANSCRIPT
Week 33 ChemistryGas Laws
Warm Up: 4 Minutes
You should be working SILENTLYStay in your own seat
If the pressure of a tire is over 35 psi, it is likely to explode. If the initial pressure of a tire is 32.5 psi at 15 ºC, calculate the new pressure at 40 ºC.
Is the tire likely to explode at 40 ºC?
Write the Learning Target
24183
This is the passing rate
How to improve your grade
Turn in missing assignments (this is the biggest issue right now)
Make up Missed Exams Come to tutorials for extra help
Agenda
Warm Up: 7 Minutes Combined Gas Law Video: 15 Minutes Guided Practice: 13 Minutes Independent Practice: 15 Minutes Closing: 3 Minutes
Combined Gas Law Video1. Go to shschem.weebly.com (our class
website)Bookmark this if you haven’t done so already!!!
2. Hover over my page:Mr. Ghosh Video Lessons
3. Watch video for April 284. Take notes on your handout
Let’s Review our Gas Laws
2
2
1
1
TP
TP
1 2
1 2
V VT T
P1V1 = P2V2
G. Lussac’s Law
Boyle’s Law
Charles Law
Putting them all together…
P1V 1n1T1
=P2V 2n2T 2
This is the
Combined Gas Law
# of Moles
Problem Solving Tip Begin all problems using the Combined Gas Law If any variables (P, V, n, or T) are not present,
delete them from both sides of the equation Substitute and solve using remaining values
Example: Problem has Pressure and Temperature, but no Volume or Moles
Example 1The initial pressure, temperature, and volume of a car tire are 33 psi, 25 ºC, and 4.8 L. If the temperature outside rises to 35 ºC and the volume expands to 5.0 L, what is the new pressure inside the tire?
Example 23.2 moles of gas have a volume of 800.0 mL at -23 ºC. How many moles of gas would be present in 675.0 mL at 227.0 ºC?
Guided Practice
Take 13 seconds to study the problem. When Mr. Ghosh indicates that you can talk,
take 48 seconds to work the problem with your teammates.
When Mr. Ghosh says SWAG, be ready to share and explain your answers.
Guided Practice #1A toy balloon contains 3 moles of gas at an internal pressure of 1.05 atm and a volume of 5.0 L. If the initial temperature of the balloon is 20 ºC, what will the volume of the balloon be if it rises to an altitude where the pressure is 0.65 atm and the temperature is -15 ºC?
7.11 L
Guided Practice #2A small research submarine contains gas with a volume of 1.2 x 105 L at a pressure of 1.0 atm and a temperature of 15 ºC. Assuming the number of moles remains constant, the submarine descends to a depth where the new volume is 767 L and the temperature is 3 ºC. What is the new pressure on the gas?
150 atm
Guided Practice #3If I initially have 4.0 L of a gas at a temperature of 38 ºC, what will the temperature be if I increase the volume to 5.0 L?
389 K
Independent Practice
Its time to see if you truly understand the Combined Gas
Law. ..
Closing
Which law relates P and V?
Which law relates V and T? Which law relates P and T? Which law relates P, V, n, and T?
Warm Up: 4 Minutes
You should be working SILENTLYStay in your own seat
The initial pressure, volume, and temperature a gas are 1 atm, 3.4 L, and 27 ºC. If the pressure increases to 3.2 atm, and the temperature rises to 79 ºC, what is the new volume?
Write the Learning Target
The initial pressure, volume, and temperature a gas are 1 atm, 3.4 L, and 27 ºC. If the pressure increases to 3.2 atm, and the temperature rises to 79 ºC, what is the new volume?
Agenda
Warm Up: 7 Minutes Ideal Gas Law Video: 15 Minutes Guided Practice: 13 Minutes Independent Practice: 15 Minutes Closing: 3 Minutes
Ideal Gas Law Video1. Go to shschem.weebly.com (our class
website)Bookmark this if you haven’t done so already!!!
2. Hover over my page:Mr. Ghosh Video Lessons
3. Watch video for April 294. Take notes on your handout
Ideal Gas
Perfect gases under perfect conditions
IDEAL GAS LAWDESCRIBING THE BEHAVIOR OF IDEAL GASES
PV = nRTP = pressureV = volume in LITERSn = molesR = gas constantT = temperature in KELVIN
RKmolatmL
08206.0Kmol
kPaL314.8
KmolmmHgL
4.62
Example 1What is the volume of 0.25 moles of oxygen gas at 250 K and 360 mmHg? Kmol
kPaL314.8
KmolmmHgL
4.62
KmolatmL
08206.0
Example 2How many moles of hydrogen would be contained in 6.0 L of the gas at 101.4 kPa and 64oC?
KmolkPaL
314.8
KmolmmHgL
4.62
KmolatmL
08206.0
Guided Practice #1What is the temperature of 0.456 mol of gas at 1 atm if the gas is held in a 10.0 L container?
KmolkPaL
314.8
KmolmmHgL
4.62
KmolatmL
08206.0
Guided Practice #2What volume is occupied by 1.23 moles of methane, CH4, at 27oC and 1.59 atm?
KmolkPaL
314.8
KmolmmHgL
4.62
KmolatmL
08206.0
Independent Practice
Its time to see if you truly understand the Ideal Gas Law. ..
Closing What variables are needed to use the
Ideal Gas Law equation?
Warm Up: 3 Minutes
You should be working SILENTLYStay in your own seat
The pressure for an ideal gas is 72.8 kPa. If there are 4.6 moles in a 10.7 L container, calculate the temperature of the gas.
Write the Learning Target
KmolkPaL
314.8
KmolmmHgL
4.62
KmolatmL
08206.0
Agenda
Warm Up: 7 Minutes Ideal Gas Law Video: 15 Minutes Guided Practice: 13 Minutes Independent Practice: 15 Minutes Closing: 3 Minutes
Announcements
Gas Law Quiz FRIDAY (Boyles, Charles, G. Lussac’s, Combined, Ideal)
Gas Law Exam 5/7
Today you will need:
Calculator Periodic Table
Ideal Gas Law-Part 2 Video1. Go to shschem.weebly.com (our class
website)Bookmark this if you haven’t done so already!!!
2. Hover over my page:Mr. Ghosh Video Lessons
3. Watch video for April 304. Take notes on your handout
Example 1What is the volume of 22.0 g carbon dioxide (CO2) at 312 K and 795 mmHg?
KmolkPaL
314.8
KmolmmHgL
4.62
KmolatmL
08206.0
Uh oh…
We are given grams…but “n” needs to be in moles.
How do we go from grams to moles?
Use Molar Mass!
Review of Molar Mass
Example 1What is the volume of 22.0 g carbon dioxide (CO2) at 312 K and 795 mmHg?
KmolkPaL
314.8
KmolmmHgL
4.62
KmolatmL
08206.0
Example 2How many grams of hydrogen gas (H2) would be contained in 5.35 L of the gas at 119.7 kPa and -29oC?
KmolkPaL
314.8
KmolmmHgL
4.62
KmolatmL
08206.0
Guided Practice #1What is the temperature of 71.8 g nitrogen gas (N2) at 1 atm if the gas is held in a 10.0 L container?
KmolkPaL
314.8
KmolmmHgL
4.62
KmolatmL
08206.0
Guided Practice #2What volume is occupied by 7.02 moles of sulfur dioxide, SO2, at 361oC and 14.07 atm?
KmolkPaL
314.8
KmolmmHgL
4.62
KmolatmL
08206.0
Independent Practice
Its time to see if you truly understand the Ideal Gas Law. ..
Closing How does the ideal gas law relate P, V,
n, and T?
Warm Up: 4 Minutes
You should be working SILENTLYStay in your own seat
An ideal gas is trapped in a closed container. The pressure inside the container is 634 mmHg. If there are 38 g H2 at 98 ºC, calculate the volume of the container.
Write the Learning Target
Agenda
Warm Up: 7 Minutes Gas Law Stoichiometry Video: 15 Minutes Guided Practice: 13 Minutes Independent Practice: 15 Minutes Closing: 3 Minutes
Gas Law Stoichiometry Video1. Go to shschem.weebly.com (our class
website)Bookmark this if you haven’t done so already!!!
2. Hover over my page:Mr. Ghosh Video Lessons
3. Watch video for May 14. Take notes on your handout
Remember this?
It’s time to do…
Gas Law Stoichiometry
Example 1The reaction of zinc and hydrochloric acid is shown below:
Zn + 2 HCl ZnCl2 + H2
If 17L of hydrogen gas are formed at a pressure of 2.6 atm and a temperature of 180 ºC, how many moles of zinc reacted?
Example 2How many grams of Mercury (II) Chloride will react with 0.567 L ammonia at 27.0 ºC and 115 kPa?
HgCl2 + 2 NH3 NH4Cl + Hg(NH2)Cl
Guided Practice #1The combustion of octane is shown below:
2 C8H18 + 25 O2 16 CO2 + 18 H2O
If 38L of carbon dioxide are formed at a pressure of 186 mmHg and a temperature of 146 K, how many moles of octane reacted?
Guided Practice #2How many grams of sodium hydrogen carbonate (NaHCO3) are needed to react to form 11.64 liters of carbon dioxide?
HNO3 + NaHCO3 NaNO3 + CO2 + H2O
Independent Practice
Its time to see if you truly understand Gas Law
Stoichiometry. ..
Closing How does the ideal gas law relate P, V,
n, and T?
Warm Up: 5 Minutes
You should be working SILENTLYStay in your own seat
Zinc metal reacts with hydrochloric acid according to the reaction below:
Zn + 2 HCl 2 ZnCl2 + H2
If 14.5 L hydrogen gas were produced at a pressure of 4.7 atm and a temperature of 45 ºC, calculate the number of moles of hydrochloric acid that reacted. [Use R = 0.08206]
Write the Learning Target
Agenda
Warm Up: 9 Minutes Quiz Expectations: 4 Minutes Gas Laws Quiz: 30 Minutes Closing: 2 Minutes
Material Covered
Boyle’s Law Charles Law G. Lussac’s Law Combined Gas Law Ideal Gas Law Gas Law Stoichiometry (Extra Credit)
Goal
To demonstrate mastery, we are shooting for
85%
Check Point
What is your goal for this quiz?
85%
Expectations for Quiz
Clear your desk of everything except a....
1. Pencil/Pen2. Calculator
All backpacks and binders on the floor
Expectations Students will keep eyes on own paper
Cheating will result in an automatic ZERO
Students will remain SILENT for the duration of the quiz
Good Luck!!
Quiz Correction:
For the Extra Credit problem:
Assume P = 1 atm and T = 0 ºC
Closing
How was your Quiz Today?
What topics do you feel you still need review on?