Matter energy gases aim how do gases react due to changes in temperature pressure and volume
This presentation is the property of its rightful owner.
Sponsored Links
1 / 18

Do Now: According to Reference Table H, which substance has the highest vapor pressure at 75 o C? PowerPoint PPT Presentation


  • 36 Views
  • Uploaded on
  • Presentation posted in: General

Matter & Energy – Gases Aim: How do gases react due to changes in temperature, pressure, and volume?. Do Now: According to Reference Table H, which substance has the highest vapor pressure at 75 o C? HW:. Pressure & Moles. Rigid container  pump in more air What happens to # of collisions?

Download Presentation

Do Now: According to Reference Table H, which substance has the highest vapor pressure at 75 o C?

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Matter energy gases aim how do gases react due to changes in temperature pressure and volume

Matter & Energy – GasesAim: How do gases react due to changes in temperature, pressure, and volume?

Do Now:

According to Reference Table H, which substance has the highest vapor pressure at 75oC?

HW:


Pressure moles

Pressure & Moles

  • Rigid container  pump in more air

  • What happens to # of collisions?

  • What happens to pressure?

  • Direct/indirect relationship?


Pressure volume

Pressure & Volume

Boyle’s Law

  • If container is smaller…

  • What happens to…

  • # of particles?

  • Space between them?

  • # of collisions?

  • Pressure?

  • Direct/Indirect relationship?


Look a real life example

Look! A real life example!

  • Bag O’Chips at the top of Waimea Canyon, Kauai, Hawaii (elev. 4000 ft)

  • Same Bag O’Chips at sea level, Poipu Beach, Kauai, Hawaii


Pressure volume relationship

Pressure-Volume Relationship


Other examples of this relationship

Other examples of this relationship

  • SCUBA diving

    • Higher pressure underwater, so lungs are compressed

    • As diver rise to the surface, they must exhale – as the pressure on their bodies (and lungs) decreases, the volume of their lungs increases – the lungs could burst!

  • Breathing


Pressure temperature

Pressure & Temperature

  • What happens if you heat a sealed container in the microwave? (Think in terms of molecular movement)

  • Joseph Gay-Lussac’s Law

  • Temperature increases…

  • KE of particles?

  • # of collisions?

  • Pressure?

  • Direct/Indirect relationship?


Volume temperature

Volume & Temperature

What happens to KE of mlcls as the T increases?

What happens to size of container (if the walls are flexible?)

Charles’ Law

Direct/Indirect relationship?


Volume temperature relationship

Volume-Temperature Relationship


Topic matter energy gases

Topic: Matter & Energy - Gases

  • Aim: How do you calculate changes in the conditions of a gas?

  • DN: What would happen to a balloon if you filled it to capacity inside your air-conditioned home, then went outside on a 90 degree day? Why?

  • HW: RB p. 69 #48-51, 57-59

  • castlelearning due next MON. Write out numerical setups and answers for #1, 4, 10, 12, 13 (the calculation questions)


Combined gas law

Combined Gas Law

  • Table T

  • Shows relationships among pressure, volume, and temperature, and shows what happens if P, V, or T of a gas are changed

    P1V1=P2V2

    T1 T2

    The (1) refers to initial conditions, the (2) refers to new/final conditions

  • Temp MUST be in K!!!


Do now according to reference table h which substance has the highest vapor pressure at 75 o c

At a temperature of 273 K 400ml gas sample has a pressure of 101.3kPa. If the pressure is changed to 50.65kPa, at which temperature will this gas sample have a volume of 551ml?

P1V1 = P2V2

T1 T2

P1 = 101.3kPa 101.3kPa x 400ml =50.65kPa x 551ml

V1 = 400ml 273K T2

T1 = 273K 101.3kPa x 400ml x T2 = 50.65kPa x 551ml x 273K

P2 = 50.65kPa T2 = 188K

V2 = 551ml

T2 = X


Rules

Rules…

  • If a problem says that one of the factors (P, V, or T) stays constant, cross that factor out of the equation!

  • Remember: Temperature must always be in Kelvin!!!!!

  • If a problem mentions STP, refer to TABLE A, which has the values for the standard TEMPERATURE and PRESSURE.


Do now according to reference table h which substance has the highest vapor pressure at 75 o c

A sample of sulfur gas at 50°C and a volume of 5.0L is cooled to 10°C as pressure remains constant, what is the new volume?

P1V1 = P2V2

T1 T2

P is constant, so we cross it out!

V1 = V2

T1 T2


Do now according to reference table h which substance has the highest vapor pressure at 75 o c

At STP a gas has a volume of 20 L. If the pressure increases to 2 atm and the temperature decreases to 200 K, what is thenew volume?

Initial ConditionsFinal Conditions

P1 = 1 atm    P2 = 2 atm   

V1 = 20 L    V2 = ?   

T1 = 273 K    T2 = 200 K

(Note: the T & P

values are from Table A!

We use the atm unit for

pressure b/c atm is used in

the problem, not kPa.)


Do now according to reference table h which substance has the highest vapor pressure at 75 o c

A sample of gas confined to a volume of 10 L at 10oC and 2 atm is subjected to a pressure increase to 2.5 atm and a temperature decrease of 10oC. What is the new volume?


Sample problems

Sample Problems

  • As the pressure of a gas at 2 atm is changed to 1 atm at constant temperature, the volume of the gasdecreases

    increases

    remains the same

  • The volume of a given mass of an ideal gas at constant pressure isdirectly proportional to the Kelvin temperature.

    directly proportional to the Celsius temperature.

    inversely proportional to the Kelvin temperature.

    inversely proportional to the Celsius temperature


  • Login