P13: Kinetic Theory Flashcards

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1
Q

Gas > Liquid

A

Condensation

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2
Q

Liquid > Gas

A

Vaporisation/ Boiling

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3
Q

Solid > Liquid

A

Melting

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4
Q

Liquid > Solid

A

Solidifying/ Freezing

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5
Q

Solid > Gas

A

Sublimation

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6
Q

Gas > Solid

A

Condensation

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7
Q
A

Vibrate in a fixed position.

Keeps its shape.

Least Energy.

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8
Q
A

In contact with each other.

Can move around randomly, so has no fixed shape.

Middle Energy

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9
Q
A

Move about at random much faster.

Much farther apart.

Much lower density.

Most energy

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10
Q

Specific Heat Capacity

A

Energy needed by 1kg of the substance to raise its temperature by 1oC.

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11
Q

Specific Heat Capacity (J/kgoC) =

A

Energy Transferred (J)/ Mass (kg) x Temperature Change (oC)

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12
Q

The greater the mass of an object…

A

… The more slowly its temperature increases when it is heated.

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13
Q

When does evaporation take place?

A

At any temperature.

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14
Q

When does boiling take place?

A

At the boiling point

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15
Q

When a pure substance is changing state…

A

… The temperature stays the same.

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16
Q

Latent Heat

A

The energy supplied to a substance when it changes state. Called ‘latent’ (hidden) because the energy it supplies does not change the temperature at the melting/ boiling point.

17
Q

Fusion

A

Often used to describe melting because different solids can be ‘fused’ when they melt.

18
Q

Evaporation

A

Occurs on the surface of a liquid under its boiling point.

19
Q

Specific Latent Heat of Fusion

A

energy needed to melt 1kg of a substance with no change of temperature.

20
Q

What is the unit of specific latent heat?

A

J/kg

21
Q

Specific Latent Heat of Fusion (LF) =

A

Energy (j) / Mass (kg)

22
Q

Specific Latent Heat of Vaporisation (Lv) =

A

Energy (j) / Mass (kg)

23
Q

Specific Latent Heat of Vaporisation

A

The energy needed to change 1kg of a substance at its boiling point from liquid to vapour.

24
Q
A