chapter 5

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Across
  1. 3. is a reaction in which one element is substituted for another element
  2. 5. a process that involves the rearrangement of the molecular or ionic structure of a substance
  3. 7. A number placed in front of a formula to balance a chemical equation
  4. 10. developed the modern system of naming chemical substances
  5. 12. proteins that help speed up metabolism, or the chemical reactions in our bodies
  6. 16. a character, usually a letter or number, that's printed slightly below and to the side of another character
  7. 17. is when parts of two ionic compounds are exchanged, making two new compounds
  8. 18. any substance that increases the rate of a reaction without itself being consumed
  9. 20. the construction of complex chemical compounds from simpler ones
  10. 21. substances initially present in a chemical reaction are consumed during the reaction to make products
Down
  1. 1. when oxygen combines with an element or a compound, forming an oxide
  2. 2. a representation of a chemical reaction using symbols of the elements to indicate the amount of substance
  3. 4. mass is neither created nor destroyed in chemical reactions
  4. 6. the minimum amount of energy that is required to activate atoms or molecules
  5. 8. releases heat, causing the temperature of the immediate surroundings to rise
  6. 9. is a chemical reaction accompanied by the absorption of heat
  7. 11. an equation for a chemical reaction in which the number of atoms for each element in the reaction
  8. 13. a substance that is formed as the result of a chemical reaction
  9. 14. an insoluble solid that emerges from a liquid solution
  10. 15. is a chemical reaction in which one reactant breaks down into two or more products
  11. 19. a substance that delays slows or prevents a chemical reaction