Chemistry Crossword

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Across
  1. 3. one or more substances are converted into a new substance with new properties, most are irreversible
  2. 4. discovered the atom was spherical in shape, found this information in 1803
  3. 5. a guess made by an observer, every guess only has 1
  4. 9. also known as amu, is the sum of the masses of the element's isotopes Isotope atom of the same element with a different number of neutrons, EX> Beryllium 8=Beryllium 9
  5. 14. neutral, found in nucleus, contributes to mass
  6. 17. how reproducible your data is, hitting the same spot consistently
  7. 19. increases with temperature increase, expands
  8. 21. number of protons equal to the number of electrons, also known as a stable atom
  9. 23. amount of matter in a given amount of space, unique to the object, to find use the equation: mass/volume
  10. 24. discovered electrons, plum pudding, Cathode Ray Tube Experiment
  11. 27. observed/measured without changing the substance itself, EX> color/shape/texture/smell/state of matter/etc.
  12. 28. numerical data, EX> age/weight/amount
  13. 29. located in the middle of the box representing the element, tells you what the element is
  14. 30. positive, found in nucleus, contributes to mass
Down
  1. 1. change is a substance that does not alter the chemical identity, EX> ripping/cutting/sharpening/etc.
  2. 2. gold foil experiment, discovered that the nucleus was small/dense/positive
  3. 6. negative, found outside the nucleus, does not contribute to mass
  4. 7. discovered the atom, greek philosopher
  5. 8. used to distinguish between and identify substances, can be physical or chemical
  6. 10. you can find it by adding the number of protons and number of neutrons, it is the total number of protons and neutrons in the nucleus
  7. 11. indicates how a substance will react/fail to react with another substance, determined by changing the substances identity/composition
  8. 12. two or more elements that are chemically combined, definite ratio
  9. 13. how close your answer is to the accepted value, hitting the bullseye
  10. 15. smallest particle of an element that has the same properties as the element, has a central nucleus
  11. 16. a substance that is made of one kind of atom, it cannot be decomposed into a simpler substance by ordinary chemical processes.
  12. 18. data observed without measuring, EX> color/shape/smell/texture/etc.
  13. 20. bendable, pounded into thin sheets
  14. 22. never changes, measured in grams
  15. 25. located at the top of the box representing the element, is equal to the number of protons
  16. 26. formed into a wire, ability to be formed without fracture