8 Matter and Energy U4 L1 Chemical Reactions

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Across
  1. 4. Properties of a substance involved in a chemical reaction result in ____ properties than the original substance
  2. 5. This is an example of Endothermic reaction
  3. 6. This is a chemical reaction when energy is released
  4. 8. Each element has its own chemical ____
  5. 9. reaction This is a chemical reaction that requires input of energy
  6. 14. When ____ ____ ____ you must make sure the reactants and products contain the same number of atoms of each element
  7. 16. This uses chemical symbols and numbers to represent a given substance ____
  8. 18. Changes in ____ are part of all chemical reactions
  9. 19. Chemical reactions can either ____ ____ ____ energy
Down
  1. 1. During a chemical reaction bonds may be ____ ____ ____
  2. 2. Substances are described before or after a reaction by their ____
  3. 3. This describes how fast a chemical reaction occurs
  4. 7. This is an expression that uses symbols to show the relationship between the starting substance and the substance that are produced by a chemical reaction ____ ____
  5. 10. This is a number that is placed in front of a chemical formula
  6. 11. This is an example of an exothermic reaction
  7. 12. This is the process in which atoms are rearranged to produce new substances ____ ____
  8. 13. This is the number written below and to the right of a chemical symbol on the periodic table
  9. 15. The subscript tells you how many of each type of atom are in a ____
  10. 17. ____ subscripts in a chemical formula of a compound would change the identity of the complound