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  1. 2. amount of energy needed to change a to quantity (mole or gram) from solid to liquid.
  2. 7. made up of particles such as atoms, occupies a place in space is in constant motion, and has a mass.
  3. 8. visible by the naked eye.
  4. 9. consists of a regular repetition of a group of atoms in three dimensional space.
  5. 10. forces of attraction or repulsion between neighbouring particles (ions, atoms, molecules).
  6. 11. a chemical reaction during which heat energy is absorbed from the surroundings.
  7. 14. is the form of energy an object or particle has as a result of its motion.
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  1. 1. a chemical reaction during which heat energy is released to the surroundings.
  2. 3. stored energy.
  3. 4. a neutrally charged group of atoms held together by chemical bonds.
  4. 5. the lowest temperature possible (-273.15 oC).
  5. 6. so small it is only visible with a microscope.
  6. 12. liquifying or melting a substance.
  7. 13. the heat transfer by a system during a chemical reaction.