States of Matter

• cooler surroundings

  endothermic
• hotter than surroundings

  exothermic
• conserved in chemical reactions

  energy
• the total energy of the system is?

  the same before and after a rection
• phase changes take in heat from surrounding environment

  endothermic
• the forces that bind together the atoms and molecules of a given substance determine its?

  melting and boiling points
• the stronger the forces?

  the more energy is needed to overcome them
• once hear overcomes these binding forces, the atoms move about more freely, allowing liquids to flow and gases to evaporate
• phase change releases heat energy into its environment

  exothermic
• when a substance loses heat energy, the attractive forces between atoms slow them down, reducing ther?

  mobility
• states of Matter

  solid, liquid, gas
• the amount of energy required to change the phase of a material is known as the?

  enthalpy or latent
• 1. RECOMBINATION
  2. IONIZATION
  3. VAPORIZATION
  4. CONDENSATION
  5. DEPOSITION
  6. SUBLIMATION
  7. FREEZING
  8. MELTING 


  S

  
• TYOES OF CHANGES OF STATE

  1. FREEZING
  2. MELTING
  3. EVAPORATION
  4. CONDENSATION
  5. SUBLIMATION
  6. DEPOSITION
• solid changes into liquid (heat added)

  ex. a block of butter melting

  
  

  melting
• liquid changes into a solid( heat is removed)

  ex. water turning into ice

  freezing
• liquid changes into gas ( heat is added)

  ex. wet clothes drying in the sun

  
  

  evaporation
• gas changes into liquid ( heat is removed)

  ex. cloud formation

  condensation
• solid changes directly into gas ( heat is added)

  ex. dry ice ( solid form of carbon dioxide )

  sublimation
• gas changes into a solid ( heat is removed)

  ex. formation of frost

  deposition
• involves the absorption of heat

  endothermic reactions
• the ____ mixing with water creates cold.

  ammonium nitrate