Chapter 3.4 Review

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Across
  1. 2. substances that participate in a chemical reaction
  2. 4. an arrow that points from reactants to the products
  3. 5. states that matter is neither created nor destroyed in ordinary physical and chemical changes
  4. 9. numbers written below and to the right of a chemical symbol
  5. 11. energy released to the surroundings, reation mixtures often feel warm
  6. 13. what you would do to a chemical equation in order to ensure that the reactants and products contain the same number of atoms of each
  7. 14. particles move faster when this is higher which allows for more particle collision and a higher rate of reaction
  8. 15. substances formed in a reaction
  9. 18. the number that is placed in front of a chemical formula
  10. 19. an expression that uses symbols to show the relationship between the starting substances and the substances that are produced by a chemical reaction
Down
  1. 1. a solid that can be formed during a chemical reaction, a sign that a chemical reaction has occurred
  2. 3. requires an input of energy, energy taken in from surroundings, reactions mixtures often feel cold
  3. 6. states that energy cannot be created or destroyed, energy can change form
  4. 7. the process in which atoms are rearranged to produce new substances
  5. 8. to increase this, you can crush or grind solids
  6. 10. more reactants in a given volume
  7. 12. describes how fast a reaction occurs
  8. 16. uses chemical symbols and numbers to represent a given substance
  9. 17. subsatnce that changes the rate of a chemical reaction without being used up or changed very much