CHEMISTRY

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Across
  1. 3. a pure substance that forms when two or more elements join chemically in a fixed proportion.
  2. 4. the basic building block of most of the matter around us.
  3. 6. matter that has the same chemical composition throughout and cannot be separated into its parts by physical means.
  4. 8. a process used to separate the parts of a mixture by particle size.
  5. 10. the tendency of a substance to undergo chemical changes.
  6. 12. matter made up of two or more substances that are not joined chemically.
  7. 13. a code, usually made up of one or two letters, used to represent an element.
  8. 20. a solid that forms during a chemical reaction that takes place in a solution.
  9. 21. a mixture in which substances are evenly distributed.
  10. 22. a vertical column in the periodic table.
  11. 23. a measure of an atom's mass that is equal to the number of protons & neutrons in the atom's nucleus.
  12. 24. a substance that is present at the beginning of a chemical reaction.
  13. 25. a particle with no charge, found in the nucleus of an atom.
  14. 27. a chart that organizes information about all the known elements according to their properties.
  15. 29. a characteristic of a substance that cannot be observed without changing the identity of the substance.
  16. 30. an element that does not conduct heat or electricity well and is dull and brittle.
  17. 31. a group of two or more atoms held together by chemical bonds.
  18. 33. a process by which elements and compounds combine to form new substances.
  19. 35. a horizontal row in the periodic table.
  20. 36. a method for separating solids from liquids in a solution.
  21. 37. a description of a chemical reaction using chemical formulas, subscripts, and coefficients.
Down
  1. 1. the scientific principle that matter is neither created nor destroyed during a chemical reaction.
  2. 2. a number that tells how many atoms of each element are in a molecule.
  3. 5. one of the basic substances that combine to form all other substances; a substance that cannot be broken down into simpler means.
  4. 7. the center of an atom, containing protons and neutrons.
  5. 9. a group of chemical symbols and numbers that shows the number of atoms of each element in a molecule.
  6. 11. a negatively charged subatomic particle that is located outside the nucleus of an atom.
  7. 14. a change that results in the formation of a new substance or substances.
  8. 15. a change in a substance that does not change the chemical makeup of the substance.
  9. 16. a mixture in which substances are not distributed evenly.
  10. 17. a characteristic of a substance that can be observed directly or measured with a tool without changing the identity of the substance.
  11. 18. a substance that is produced during a chemical reaction.
  12. 19. the number of protons in the nucleus of an atom.
  13. 20. a positively charged particle found in the nucleus of an atom.
  14. 26. an element that has some properties of both metals and nonmetals.
  15. 28. a number written before a chemical formula to show how many atoms or molecules of that substances are involved in a reaction.
  16. 32. a method used to separate a dissolved solid from a liquid.
  17. 34. an element that conducts heat & electricity well, is shiny, and can be hammered into sheets or drawn into wires.