Chemistry Crossword

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Across
  1. 2. pure substance that cannot be broken down into other substances; substance made up of only one type of atom
  2. 6. group 17 elements in the periodic table;the most reactive non-metals
  3. 7. description of how a substance interacts with other substances, such as acids;chemical properties are observable only when a chemical change occurs
  4. 9. reaction that takes place when two or more substances react to form new substances
  5. 12. the smallest part of an element that is representative of that element; a neutral particle made up of a nucleus containing protons and neutrons, and in which the number of electrons equals the number of protons
  6. 13. a material that electric charge can move through easily
  7. 14. description of a solid that can be stretched into a long wire
  8. 15. group 2 elements in the periodic table; their reactivity is not as strong as that of the alkali metals
  9. 17. combination of symbols that represent a compound; the formula identifies the elements in the compound and the amount of each element
  10. 18. change that results when two or more substances react to create a different substance or substances; the new substances have completely different properties from the original ones
  11. 20. mass of one atom of an element calculated from the total number of protons,neutrons, and electrons of that atom; measured in atomic mass units (amu)
  12. 21. chemical reaction that occurs when oxygen reacts with a substance to form a new substance and give off energy
  13. 23. of mass principle that matter is not created or destroyed in a chemical reaction; the mass of the products always equals the mass of the reactants
  14. 24. an experiment in which one or more products of a chemical reaction can escape
Down
  1. 1. invisible negatively charged particle that orbits the nucleus of an atom
  2. 3. pure substance formed when at least one metal and one non-metal combine
  3. 4. number of protons in the nucleus of one atom of an element
  4. 5. group 1 elements in the periodic table, not including hydrogen; the most reactive of the metals
  5. 8. chemical reaction that releases energy
  6. 10. chemical reaction that absorbs energy
  7. 11. ability of a substance to conduct electricity or heat
  8. 16. measure of atomic mass; 1 amu is equal to 1/12th the mass of a carbon 12 atom
  9. 18. an experiment in which all reactants and all products of a chemical reaction are accounted for
  10. 19. atom that has become electrically charged because it has lost or gained electrons; a positive ion is an atom that has lost one or more electrons;a negative ion is an atom that has gained one or more electrons
  11. 22. catalyst involved in chemical reactions in living things