Vanden Bout/LaBrake/Crawford CH301 GAS LAWS - Day 3 CH301 Vanden - - PDF document

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Vanden Bout/LaBrake/Crawford CH301 GAS LAWS - Day 3 CH301 Vanden - - PDF document

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Unit1Day3-LaBrake Wednesday, September 04, 2013 5:19 PM Vanden Bout/LaBrake/Crawford CH301 GAS LAWS - Day 3 CH301 Vanden Bout/LaBrake Fall 2013 Important Information HW2 POSTED - DUE TUE MORNING 9AM LM6 & 7 POSTED DUE TUE MORNING

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CH301 Vanden Bout/LaBrake Fall 2013

Vanden Bout/LaBrake/Crawford CH301 GAS LAWS - Day 3

CH301 Vanden Bout/LaBrake Fall 2013

Important Information

HW2 POSTED - DUE TUE MORNING 9AM LM6 & 7 POSTED – DUE TUE MORNING 9AM LM2,3,4 & 5 WERE DUE THIS MORNING 9AM

Unit1Day3-LaBrake

Wednesday, September 04, 2013 5:19 PM Unit1Day3-LaBrake Page 1

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CH301 Vanden Bout/LaBrake Fall 2013

What are we going to learn today?

MACROSCOPIC & MICROSCOPIC VIEWS OF GASES IDEAL GAS LAW USE IDEAL GAS LAW – IDENTIFY UNKOWN GAS

CH301 Vanden Bout/LaBrake Fall 2013

QUIZ: CLICKER QUESTION 1 (points for CORRECT answer)

According to Avagadro’s Law, a sample of H2 gas with a volume of 10 liters, at a pressure of 2 atm, and a temperature of 25°C, contains ________ “particles” compared to a sample He gas that has a volume of 5 L at the same temperature and pressure.

  • A. the same number of
  • B. two times more
  • C. four times more
  • D. two times less
  • E. four times less

Which of the following is a plot of the pressure of a gas as a function of the volume at fixed temperature?

QUIZ: CLICKER QUESTION 2 (points for CORRECT answer) A B

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CH301 Vanden Bout/LaBrake Fal 2013

function of the volume at fixed temperature?

A B C D

CH301 Vanden Bout/LaBrake Fall 2013

Describe a Gas

PHYSICAL DESCRIPTION: VOLUME PRESSURE – most abstract property TEMPERATURE AMOUNT GAS LAWs QUANTIFY THE RELATIONSHIP OF THE

  • PROPERTIES. EQUATION FORM OF LAWs GIVE

ABILITY TO PREDICT CONDITIONS AT NEW STATE

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CH302 Vanden Bout/LaBrake Spring 2012

You have a sample of O2 gas T = 10°C and a P = 1 atm. If you increase T = 20°C and keep P = 1 atm, V will:

  • A. stay the same
  • B. be slightly higher but not double the original
  • C. double compared to the original volume
  • D. decrease slightly but not in half the original
  • E. decrease to half the original volume

POLL: CLICKER QUESTION 3

CH301 Vanden Bout/LaBrake Fall 2013

TRY IT - Balloon in ice water… balloon in liquid N2 COMPARE COLD BALLOON TO BALLOON IN VACUUM

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CH301 Vanden Bout/LaBrake Fall 2013

COMPARE COLD BALLOON TO BALLOON IN VACUUM COMPARE MACROSCOPIC VIEW WITH MICROSCOPIC VIEW

http://ch301.cm.utexas.edu/simulations/gas-laws/GasLawSimulator.swf

CH301 Vanden Bout/LaBrake Fall 2013

Think back to the syringe investigation: When the VOLUME of the container is DECREASED, and the T and amount of gas remains the same, the PRESSURE: a)PRESSURE INCREASES b)PRESSURE DOES NOT CHANGE c)PRESSURE DECREASES d)PRESSURE WILL CHANGE BRIEFLY, BUT THEN RETURNS TO ORIGINAL PRESSURE

POLLING: CLICKER QUESTION 4

Think back to the syringe investigation: When the VOLUME of the container is DECREASED, and the T and amount of gas remains the same, the PRESSURE

  • INCREASES. The small particle explanation is because

the: a)# of collisions INCREASES

POLLING: CLICKER QUESTION 5

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SLIDE 6

CH301 Vanden Bout/LaBrake Fall 2013

Think back to the syringe investigation: When the VOLUME of the container is DECREASED, and the T and amount of gas remains the same, the PRESSURE

  • INCREASES. The small particle explanation is because

the: a)# of collisions INCREASES b)# of collisions DOES NOT CHANGE c)# of collisions DECREASES d)Avg speed of particles DECREASES e)Avg speed of particles DOES NOT CHANGE

CH301 Vanden Bout/LaBrake Fall 2013

Think back to the balloon in liquid N2 demonstration : When the TEMPERATURE of the container is DECREASED, and the P and amount of gas remains the same, the : a)VOLUME INCREASES b)VOLUME DOES NOT CHANGE c)VOLUME DECREASES d)VOLUME WILL CHANGE BRIEFLY, BUT THEN RETURNS TO ORIGINAL VOLUME

POLLING: CLICKER QUESTION 6

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SLIDE 7

CH301 Vanden Bout/LaBrake Fall 2013

Think back to the balloon in liquid N2 demonstration : When the TEMPERATURE of the container is DECREASED, and the P and amount of gas remains the same, THE VOLUME DECREASES - the small gas particle explanation is because the: a)AVG SPEED OF PARTICLES DECREASES b)AVG SPEED OF PARTICLES INCREASES c)AVG SPEED OF PARTICLES DOES NOT CHANGE

POLLING: CLICKER QUESTION 7

CH301 Vanden Bout/LaBrake Fall 2013

MACROSCOPIC DESCRIPTION MICROSCOPIC MODEL (SMALL PARTICLE MODEL) EMPERICALLY DERIVED MODELS

COMBINE GAS LAWS – IDEAL GAS LAW

PV = nRT The value of R depends on the units of 08205746 L atm K−1 mol−1 R = .08314472 L bar

−1 mol−1

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CH302 Vanden Bout/LaBrake Spring 2012

COMBINE GAS LAWS – IDEAL GAS LAW

PV = nRT The value of R depends on the units of measure used for the State Functions R = .08205746 L atm K−1 mol−1 R = .08314472 L bar K−1 mol−1

CH301 Vanden Bout/LaBrake Fall 2013

COMBINE GAS LAWS – IDEAL GAS EQUATION PV = nRT

THIS IS ACTUALLY QUITE COOL

USEFULLNESS? PV = nRT

Given 3 properties of the state, calculate the 4th. Predicts every single gas should have the same number density. Same P, T should be identical – moles per volume (# density). Molar volume – volume per one mole useful for gas stoichiometry. Particles have different masses, different gases should have different mass densities under same conditions. – – Unit1Day3-LaBrake Page 8

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CH301 Vanden Bout/LaBrake Fall 2013

Given 3 properties of the state, calculate the 4th. Predicts every single gas should have the same number density. Same P, T should be identical – moles per volume (# density). Molar volume – volume per one mole useful for gas stoichiometry. Particles have different masses, different gases should have different mass densities under same conditions. Given P, T and molar mass – calculate mass density of a gas. Given P, T and density – calculate the molar mass of a gas.

CH301 Vanden Bout/LaBrake Fall 2013

POLLING: CLICKER QUESTION 9

Which balloon has the higher mass density?

  • A. Ar
  • B. He
  • C. they are the same

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CH301 Vanden Bout/LaBrake Fall 2013

POLLING: CLICKER QUESTION 9

Which balloon has the higher number density?

  • A. Ar
  • B. He
  • C. they are the same

CH301 Vanden Bout/LaBrake Fall 2013

POLLING: CLICKER QUESTION 10

We have two identical containers held at the same T, one contains Ar, one contains He. The containers have the same mass density. Which has the higher pressure?

  • A. Ar
  • B. He
  • C. they are the same

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CH301 Vanden Bout/LaBrake Fall 2013

GROUP WORK

Starting with the ideal gas law and the molar mass of a gas, derive an equation for the mass density of a gas.

CH302 Vanden Bout/LaBrake Spring 2012

GROUP WORK

The oil produced from eucalyptus leaves contains the volatile organic compound

  • eucalyptol. At 190 ºC and 60.0 Torr, a sample of

eucalyptol vapor had a density of 0.320 g*L-1. Calculate the molar mass of eucalyptol.

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CH301 Vanden Bout/LaBrake Fall 2013

The oil produced from eucalyptus leaves contains the volatile organic compound

  • eucalyptol. At 190 ºC and 60.0 Torr, a sample of

eucalyptol vapor had a density of 0.320 g*L-1. Calculate the molar mass of eucalyptol.

CH301 Vanden Bout/LaBrake Fall 2013

GROUP WORK QUIZ CLICKER QUESTION

The oil produced from eucalyptus leaves contains the volatile organic compound eucalyptol. At 190 ºC and 60.0 Torr, a sample of eucalyptol vapor had a density of 0.320 g*L-1. Calculate the molar mass of eucalyptol.. a)63 g/mol b)154 g/mol c)0.01 g/mol d)10 g/mol

GROUP WORK QUIZ CLICKER QUESTION

Calculate the volume of carbon dioxide, adjusted to 25 ºC and 1.0 atm , that plants need to make 1.00 g of glucose. 6CO2 (g) + 6H2O (l)  C6H12O6 (s)+ 6O2 (g)

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CH301 Vanden Bout/LaBrake Fall 2013

6CO2 (g) + 6H2O (l)  C6H12O6 (s)+ 6O2 (g)

CH301 Vanden Bout/LaBrake Fall 2013

What did we learn today?

IDEAL GAS LAW and IDEAL GAS EQUATION CONCEPT OF NUMBER DENSITY vs MASS DENSITY DERIVED EQUATION FOR RELATIONSHIP BETWEEN MASS DENSITY AND THE MOLAR MASS OF A GAS Anything Else? Please Share….

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CH301 Vanden Bout/LaBrake Fall 2013

DAY 3 LEARNING OUTCOMES

Perform calculations using the ideal gas equation Explain the relationship between the number density and the mass density for a given gas Use the ideal gas law to determine MW of a gas Apply the concept of the gas laws to gas phase reactions and perform stoichiometric calculations Using the gas properties, masses, moles, limiting reagents and percent yields

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