jeng97

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Across
  1. 3. Who discovered electrons?
  2. 4. Can hold its own shape and is hard to compress.
  3. 6. The atoms that collide randomly with one another and can fill any container.
  4. 7. Solid to Gas.
  5. 8. True or False: When the milk turns sour it is a physical change.
  6. 10. A positively charged ion.
  7. 11. A separation method that separates solids of different sizes.
  8. 14. Everything that takes up space and has mass.
  9. 16. Type of heterogeneous mixture where the particles must not dissolve in the fluid.
  10. 17. The standard unit of mass in the SI system.
  11. 19. An educated guess.
  12. 20. Co
  13. 24. True or False: Leading zeros are significant.
  14. 26. How many significant figures are in 000.97?
  15. 27. Na
  16. 31. Change in the chemical composition of a substance.
  17. 33. Combination of proton and neutron.
  18. 34. True or False: Dicing potatoes is a physical change.
  19. 35. the substance that is dissolved in a solution.
  20. 37. Negatively charged subatomic particle.
  21. 39. Sn
  22. 40. True or False: All non-zero numbers ARE significant.
  23. 41. This separation method drives off the liquid components from the solid components.
  24. 42. Basic unit of matter.
  25. 43. Group 7A (or VIIA) of the periodic table.
  26. 44. A physical property that will be the same regardless of the amount of matter.
  27. 45. Studies carbon-based substances.
  28. 47. The study of matter and its properties.
  29. 48. Are the standards of comparison for measurements.
Down
  1. 1. Au
  2. 2. Composed of two or more kind of atom.
  3. 4. The digits that carry meaning in a number and contribute to its precision.
  4. 5. A pure substance that is made from a single type of atom.
  5. 9. How many significant figures are in 1395.00?
  6. 12. Process of converting certain elements into others.
  7. 13. How many significant figures are in 20253?
  8. 15. An effective method to separate mixtures comprised of two or more pure liquids.
  9. 18. The study of chemicals found in living things.
  10. 21. 4th state of matter.
  11. 22. Pb
  12. 23. How many significant figures are in 3.25?
  13. 25. Electrons in the last electron shell.
  14. 26. any zero that appears to the right of both the decimal point and every digit other than zero.
  15. 28. Charged atom or molecule.
  16. 29. a mixture that is relatively uniform in composition.
  17. 30. The properties can be observed or measured without changing the composition of matter.
  18. 31. separation of a mixture through a medium in which the components move at different rates.
  19. 32. Result of combining two or more substances.
  20. 36. Kr
  21. 38. Zeros attached to the beginning of a number.
  22. 46. At