Responses to Heat

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States of Matter 

There are three states of matter:

  • solid
  • liquid
  • gas

Changes of State

  • Melting - to become from liquid to solid
  • Evaporation - to change from liquid to gas
  • Freezing - to change from liquid to solid
  • Condensation - to change from gas to liquid
  • Sublimation - when a solid becomes a gas without becoming a liquid and vice versa

Solids, Liquids, Gases

Image result for solids liquids and gases table

Latent Heat

  • Latent heat is the amount of energy absorbed or released by a chemical substance during a change of state
  • No change of temperature occurs during this transition
  • When a solid melts, latent heat absorbs energy to break bonds and disrupt arrangment of particles
  • When freezing, latent heat releases energy to bond particles together

Freezing Point Depression

  • salt can be used as a freezing point depressant
  • it lowers melting point of ice so it melts faster and it makes it more difficult to freeze again


  • diffusion is the movement of gas particles from an area of high concentration to an area of low concentration

Solubility Vocabulary

  • solvent - liquid that does the dissolving
  • solute - the stuff that gets dissolved
  • solution - solvent and solute together
  • soluble - if something can dissolve it is called 'soluble'
  • insoluble - if something cannot dissolve it is called 'insoluble'
  • suspension - when insoluble stuff is…


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