Unit 5 Vocab

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Across
  1. 3. A number placed in front of the parts of a chemical equation to indicate how many are involved; always a positive whole number
  2. 7. A type of reaction in which the positive and negative portions of two ionic compounds are interchanged
  3. 11. The study of relationships between measurable quantities such as mass and volume, and the number of atoms in chemical reactions.
  4. 15. A flowing substance with a definite volume but an indefinite shape
  5. 16. the kind and number of atoms of each element present in a molecular compound
  6. 18. Percent by mass of each element in a compound
  7. 20. The simplest ratio of ions in a compound
  8. 22. A substance in which the particles occupy fixed positions in a well-defined, three dimensional arrangement.
  9. 24. A substance that undergoes a reaction
  10. 27. The smallest particle of a given type of matter
  11. 29. A biological catalyst
  12. 30. A measurement of the “amount of a substance”
  13. 31. A flowing compressible substance with no definite volume or shape
  14. 32. Term for a system where no net change occurs in the amount of reactants or products
  15. 33. A substance that speeds up the rate of a reaction without being used up itself or permanently changed
  16. 34. is equal to the atomic mass units
  17. 35. The name applied to a reaction in which two more more substance combine to form a single product
Down
  1. 1. A substance that slows down a reaction
  2. 2. A reaction in which a substance reacts with oxygen gas releasing energy as heat and light
  3. 4. An uncharged group of two or more atoms held together by covalent bonds
  4. 5. A new substance formed when reactants undergo a chemical change
  5. 6. The reactant of which there is not enough; when it is used up, the reaction stops and no new product is formed
  6. 8. The formula of a compound having the smallest whole-number ratio of atoms in the compound
  7. 9. 6.022 x 1023
  8. 10. States that if a stress is applied to a system at equilibrium, the system shifts in the direction that relieves the stress.
  9. 12. A substance that cannot be broken down into simpler substances
  10. 13. A solution dissolved in water, abbreviated (aq) in a chemical equation
  11. 14. The mass in atomic mass units of one molecule of a covalent compound
  12. 17. The amount of energy the particles in a reaction must have when they collide for the reaction to occur.
  13. 19. The maximum amount of product that can be produced from a given reactant - determined by stoichiometric calculations - expressed as a percent.
  14. 21. A type of reaction in which one element takes the place of another in a compound
  15. 23. The name applied to a reaction where a compound breaks down into two or more simpler substances
  16. 25. The amount of a substance present in a unit volume
  17. 26. A number written in a smaller font, positioned to the right of a chemical symbol to indicate the number of atoms of a particular element that are found in a molecule
  18. 28. The ratio of actual yield (from an experiment) expressed as a percent