Devil physics the baddest class on campus ib physics 2
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Devil physics The baddest class on campus IB Physics-2. Tsokos Lesson 3-3 ideal gases. IB Assessment Statements. Topic 10.2., Thermal Physics: Processes 10.2.1.Deduce an expression for the work involved in a volume change of a gas at constant pressure.

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Devil physics The baddest class on campus IB Physics-2

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Devil physics the baddest class on campus ib physics 2

Devil physicsThe baddest class on campusIB Physics-2


Tsokos lesson 3 3 ideal gases

Tsokos Lesson 3-3ideal gases


Ib assessment statements

IB Assessment Statements

Topic 10.2., Thermal Physics: Processes

10.2.1.Deduce an expression for the work involved in a volume change of a gas at constant pressure.

10.2.2.State the first law of thermodynamics.

10.2.3.Identify the first law of thermodynamics as a statement of the principle of energy conservation.


Ib assessment statements1

IB Assessment Statements

Topic 10.2., Thermal Physics: Processes

10.2.4.Describe the isochoric (isovolumetric), isobaric, isothermal and adiabatic changes of state of an ideal gas.

10.2.5.Draw and annotate thermodynamic processes and cycles on P-V diagrams.


Ib assessment statements2

IB Assessment Statements

Topic 10.2., Thermal Physics: Processes

10.2.6.Calculate from a P-V diagram the work done in a thermodynamic cycle.

10.2.7.Solve problems involving state changes of a gas.


Objectives

Objectives

  • State the definition of pressure, P = F/A

  • Understand that an ideal gas is a gas in which the molecules do not exert forces on each other except when colliding

  • Understand that an ideal gas obeys the law, PV = nRTat all pressures, temperatures and volumes


Objectives1

Objectives

  • Understand the ideal gas law and solve problems using it

  • Appreciate that pressure in a gas develops as a result of collisions between the molecules and the walls of the container in which the momentum of the molecules changes


Video developing the gas laws

Video – Developing the Gas Laws


Pressure

Pressure

  • Force per unit area

  • Only the force normal to the area

  • Unit is the Pascal (Pa) or Nm-2

  • Atmospheric pressure is 1.013 x 105 Pa


Moles of gases

Moles of Gases

  • Convenient to use moles (not the furry kind)

  • Avogadro's Avocado number

  • Atomic Mass = Molar Mass = grams/mol


Moles of gases1

Moles of Gases

  • The number of moles can be found by dividing the number of molecules, N, by the Avogadro's Avocado number

  • Also found by dividing the mass of the gas in grams by the Atomic / Molar Mass


Boyle mariotte law

Boyle-Mariotte Law

  • At constant temperature and with a constant quantity of gas, pressure is inversely proportional to volume

  • The graph of pressure versus volume is a hyperbola, aka an isothermal curve


Volume temperature law

Volume-Temperature Law

  • When the temperature is expressed in Kelvin and pressure is kept constant, volume and temperature are proportional to each other


Volume temperature law1

Volume-Temperature Law

  • When the temperature is expressed in Kelvin and pressure is kept constant, volume and temperature are proportional to each other

Graph of different quantities of the same gas or same gas at different pressures


Pressure temperature law

Pressure-Temperature Law

  • When the temperature is expressed in Kelvin and volume is kept constant, pressure and temperature are proportional to each other


Pressure temperature law1

Pressure-Temperature Law

  • When the temperature is expressed in Kelvin and volume is kept constant, pressure and temperature are proportional to each other


Equation of state

Equation of State


Ideal gas law

Ideal Gas Law

  • An ideal gas will obey this law at all temperatures, pressures and volumes.

  • Real gases obey this law only for a certain range of temperatures, pressures and volumes.


Ary review

Σary Review

  • Can you state the definition of pressure, P = F/A?

  • Do you understand that an ideal gas is a gas in which the molecules do not exert forces on each other except when colliding?

  • Do you understand that an ideal gas obeys the law, PV = nRTat all pressures, temperatures and volumes?


Ary review1

Σary Review

  • Do you understand the ideal gas law and can you solve problems using it?

  • Do you appreciate that pressure in a gas develops as a result of collisions between the molecules and the walls of the container in which the momentum of the molecules changes?


Ib assessment statements3

IB Assessment Statements

Topic 10.2., Thermal Physics: Processes

10.2.1.Deduce an expression for the work involved in a volume change of a gas at constant pressure.

10.2.2.State the first law of thermodynamics.

10.2.3.Identify the first law of thermodynamics as a statement of the principle of energy conservation.


Ib assessment statements4

IB Assessment Statements

Topic 10.2., Thermal Physics: Processes

10.2.4.Describe the isochoric (isovolumetric), isobaric, isothermal and adiabatic changes of state of an ideal gas.

10.2.5.Draw and annotate thermodynamic processes and cycles on P-V diagrams.


Ib assessment statements5

IB Assessment Statements

Topic 10.2., Thermal Physics: Processes

10.2.6.Calculate from a P-V diagram the work done in a thermodynamic cycle.

10.2.7.Solve problems involving state changes of a gas.


Questions

Questions


Homework

Homework

#1-19


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