Changes of state
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Changes of State. Changing State. By removing or adding energy, a substance can lose or absorb energy, its temperature can change, its state can change, and the speed of its particles can change. Changes of State. State of Matter. heat. inside. Melting.

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Changes of State

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Changes of state

Changes of State


Changing state

Changing State

  • By removing or adding energy, a substance can lose or absorb energy, its temperature can change, its state can change, and the speed of its particles can change.


Changes of state1

Changes of State


State of matter

State of Matter


Melting

heat

inside

Melting

  • The temperature at which a substance changes from a solid to a liquid is its melting point.

  • Melting is an endothermic change. A substance absorbs energy during an endothermic change.


Freezing

outside

heat

Freezing

  • The temperature at which a liquid changes into a solid is its freezing point. Freezing of any substance occurs when a liquid changes to a solid.

  • A substance loses energy during an exothermic change. Freezing is an exothermic change.


Turn to your partner and summarize

Turn to your partner and summarize

  • The difference between a endothermic and exothermic change in relation to energy


Comparing changes of state

Comparing Changes of State


Vaporization

Vaporization

  • The particles of water that evaporate from an open container have more speed and higher energy than the particles that remain.

  • Water enters the atmosphere through the process of vaporization. It is an endothermic change.

  • Boiling is vaporization that occurs throughout a liquid. Boiling changes a liquid to a gas.


A second form of vaporization is evaporation

A second form of vaporization is evaporation.

  • Evaporation is vaporization that occurs at the surface of a liquid


Condensation

Condensation

  • Condensation is when a substance in a gaseous state changes to a liquid state. For a substance to change from a gas to a liquid, particles must clump together.

  • Water redeposit into lakes in the form of rain by condensation. Water forms on the outside of a glass of cold lemonade as a result of condensation. Condensation is an exothermic change.


Sublimation

Sublimation

  • The change of state from a solid straight to a gas is called sublimation. Energy must be added for sublimation to occur, so it is an endothermic change.

  • Solid carbon dioxide (dry ice) is a great example of a substance that undergoes sublimation.


Comparing changes of state1

Comparing Changes of State

  • Freezing and melting occur at the same temperature.


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