chemistry crossword

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Across
  1. 6. invisible negatively charged particle that orbits the nucleus of an atom
  2. 7. 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
  3. 9. an experiment in which all reactants and all products of a chemical reaction are accounted for
  4. 10. pure substance that cannot be broken down into other substances; substances made up of only one type of atom
  5. 11. chemical reaction that occurs when oxygen reacts with a substance to form a new substance and give off energy
  6. 12. 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
  7. 13. combination of symbols that represent a compound; the formula identifies the elements in the compound and the amount of each element
  8. 14. their reactivity is not as strong as that of the alkali metals
  9. 18. description of how a substance interacts with other substances, such as acids;chemical properties are observable only when a chemical change occurs
  10. 19. slow chemical change that occurs when oxygen in the air reacts with a metal
  11. 20. principle that matter is not created or destroyed in a chemical reaction; the mass of the products always equals the mass of the reactants
  12. 21. catalyst involved in a chemical reactions in living things
  13. 22. change of state from a liquid to a gas
  14. 23. chemical reaction that absorbs energy
  15. 25. change of state from a gas to a solid
  16. 26. a reaction that takes place when two or more substances react to form new substances
  17. 27. cloudy mixture in which tiny particles of one substance are held within another and particles cannot be separated out from the other substance
Down
  1. 1. change of state from a gas to a liquid
  2. 2. number of protons in the nucleus of one atom of an element
  3. 3. [in chemistry] vertical column of elements in a periodic table; elements in a family all have similar chemical properties; also called a group
  4. 4. the most reactive of the metals
  5. 5. 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
  6. 8. amount of mass in a given volume of a substance
  7. 13. chemical reaction that takes place in cells; food[sugar] reacts with oxygen to produce energy,water, and carbon dioxide
  8. 15. a solution in which the water is the solvent
  9. 16. chemical combination of two or more elements in a specific ratio
  10. 17. group 17 elements in the periodic table; the most reactive non-metals
  11. 24. substance that helps a chemical reaction to proceed more quickly