more changes of state Flashcards

1
Q

What is the temp of gas related to?

A

Average kinetic energy of molecule

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2
Q

What does changing the temp of a gas at a constant volume do?

A

Changes pressure exerted by the gas

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3
Q

Explain how motion of molecules in a gas is related to both its temp and pressure

A

When gas particles collide they exert a force. In a sealed container the outward gas pressure is the total force exerted by all particles in the gas in a unit area of container walls.
Fast particles and more frequent collisions both lead to increase in net force, and so gas pressure.
If temp constant, increasing volume of gas means particles spread out and hit walls less often. Pressure decrease

Pressure and volume inversely proportional- when volume goes up, pressure goes down

For gas of fixed mass at constant temp:
pV= constant

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4
Q

What is the energy needed for a substance to change state called?

A

Latent heat

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5
Q

What is the specific latent heat of a substance?

A

The amount of energy required to change the state of one kilogram of the substance with no change in temperature

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6
Q

Equation for specific latent heat

A

Energy for a change of state= mass x specific latent heat

E= m L

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7
Q

What is specific latent heat measured in?

A

J/kg

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8
Q

What is specific latent heat of fusion?

A

Change of state from solid to liquid

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9
Q

What is specific latent heat of vaporisation?

A

Change of state from liquid to vapour

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10
Q

Pressure in gases

A

Gas can be compressed or expanded by pressure change. Pressure produces net force at right angles to wall of container.
Also force outside container

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11
Q

Increasing the pressure of a gas

A

Doing work on a. gas increases internal energy of gas and can cause increase in temp if gas

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12
Q

How does doing work on an enclosed gas lead to an increase in temp of gas

A

With a bicycle pump, gas applies pressure to plumber if pump and exerts force on it. Work has been
done against force to push down plunger
Transfer energy into kinetic energy stores of gas particles, increasing temp. If pump connected to tyre should get warmer

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