Enthalpy

Name: ______________________   Date: ____________

Use the clues to fill in the crossword.

Across

  1. 4. A heavy odorless colorless gas formed during respiration and by the decomposition of organic (13)
  2. 7. Layer of air around the Earth (10)
  3. 8. An arrangement of people or things acting as a unit (9)

Down

  1. 1. A substance that can be consumed to produce energy (4)
  2. 2. A process in which a substance reacts with oxygen to give heat and light (10)
  3. 3. Occurring or formed with the liberation of heat (10)
  4. 5. A compound that exists in forms having different arrangements of atoms but the same molecular weight (6)
  5. 6. A chemical substance that is present at the start of a chemical ___ (plural) (9)