Chemical Reaction

1234567891011121314151617
Across
  1. 1. reaction energy is released to the surroundings
  2. 4. the number in front of the chemical formula
  3. 8. process when atoms are rearranged to produce new substances
  4. 9. may form a solid in a solution
  5. 11. a neutral atom that gains or loses electrons
  6. 14. changes the rate of a chemical reaction without being used up
  7. 15. CH4 is the chemical formula for what substance
  8. 16. an atom with a different number of protons than neutrons
Down
  1. 2. reaction requires an input of energy (energy is absorbed)
  2. 3. number written below and to the right of the chemical symbol
  3. 5. uses chemical symbols and numbers to represent a given substance
  4. 6. an expression that uses symbols to show the relationship between the starting substances and the substances that are produced by a chemical reaction
  5. 7. substances that participate in a chemical reaction
  6. 9. substances formed in a reaction
  7. 10. the element in period 4 group 2
  8. 12. sign is represented by and arrow in a chemical equation
  9. 13. a type of catalyst found in living things
  10. 17. the element that has 16 protons