CHEMICAL REACTION

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Across
  1. 1. reaction requires an input of energy (energy is absorbed)
  2. 3. changes the rate of a chemical reaction without being used up
  3. 4. uses chemical symbols and numbers to represent a given substance
  4. 6. process when atoms are rearranged to produce new substances
  5. 7. CH4 is the chemical formula for what substance
  6. 10. may form a solid in a solution
  7. 12. substances formed in a reaction
  8. 14. a type of catalyst found in living things
  9. 15. the number in front of the chemical formula
  10. 16. the element that has 16 protons
Down
  1. 2. the element in period 4 group 2
  2. 3. an expression that uses symbols to show the relationship between the starting substances and the substances that are produced by a chemical reaction
  3. 5. number written below and to the right of the chemical symbol
  4. 8. sign is represented by and arrow in a chemical equation
  5. 9. an atom with a different number of protons than neutrons
  6. 11. a neutral atom that gains or loses electrons
  7. 13. substances that participate in a chemical reaction
  8. 14. reaction energy is released to the surroundings