Chemistry Semester 1 Review 2016

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Across
  1. 3. matter that has a uniform and definite composition; either an element or a compound; pure matter of some kind
  2. 8. mixture that is uniform in composition; components are evenly distributed and not easily distinguished
  3. 10. one of a class of metals that are good conductors of heat and electric current; also ductile, malleable, and shiny
  4. 18. electrostatic attraction that binds oppositely charged ions together
  5. 19. a proposed explanation for an observation or a prediction regarding the outcome of an experiment
  6. 20. a positively charged subatomic particle found in the nucleus of an atom
  7. 21. change that produces matter with a different composition than the original matter
  8. 23. the simplest form of matter that has a unique set of properties; an element cannot be broken down into simpler substances
  9. 24. a measure of the amount of matter that an object contains
  10. 27. an element that tends to be a poor conductor of heat and electric current
  11. 28. the man after which the mole number is named
  12. 29. the ratio of the mass of an object to its volume
  13. 31. any atom or group of atoms with a positive charge
  14. 32. 6.022 x 10^23 of anything
Down
  1. 1. the unit of frequency; equal to one cycle per second
  2. 2. atoms react by gaining or losing electrons so as to acquire the stable electron structure of a noble gas
  3. 4. mixture that is not uniform in composition; components are not evenly distributed throughout the mixture
  4. 5. the weighted average of the masses of the isotopes of an element
  5. 6. the smallest particle of an element that retains its identity in a chemical reaction
  6. 7. the number of wave cycles that pass a given point per unit of time
  7. 9. electron in the highest occupied energy level of an atom
  8. 10. a physical blend of two or more substances that are not chemically combined
  9. 11. any atom or group of atoms with a negative charge
  10. 12. a substance that contains two or more elements chemically combined in a fixed proportion; generally held together by ionic bonds
  11. 13. a change during which some properties of a material change, but the composition of the material does not change
  12. 14. anything that has mass and occupies space
  13. 15. negatively charged subatomic particle
  14. 16. a term used to refer to the mass of one more of any substance
  15. 17. an element that tends to have properties that are similar to those of metals and nonmetals
  16. 22. an atom or group of atoms that has a positive or negative charge
  17. 25. neutral subatomic particle
  18. 26. a measure of the space occupied by a sample of matter
  19. 30. the tiny, dense central portion of an atom, composed of protons & neutrons