unit 2 Crossword Lab -Chris

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Across
  1. 3. substance: that helps a chemical reaction to proceed more quickly
  2. 5. amount of mass in a given volume of a substance
  3. 6. ability of a substance to conduct electricity or heat
  4. 7. reaction: chemical reaction that absorbs heat
  5. 9. reaction: chemical reaction that releases heat
  6. 10. mass: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)
  7. 11. solution: a solution in which water is the solvent
  8. 13. group 1 elements in the periodic table, not including hydrogen; the most reactive of the metals
  9. 15. change of state from a liquid to a gas
  10. 17. catalyst involved in the chemical reaction of living things
  11. 18. slow chemical change that occurs when oxygen in the air reacts with a metal
  12. 20. process in which molecules move from an area of higher concentration to one of lower concentration
  13. 21. shells: orbit of electrons around the nucleus of an atom
  14. 22. 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. pure substance that cannot be broken down into other substances
  2. 2. group 17 elements in the periodic table; most reactive non metals
  3. 4. 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
  4. 6. 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
  5. 8. chemical reaction that occurs when oxygen reacts with a substance to form a new substance and give off energy
  6. 12. invisible negatively charged particle that orbits the nucleus of an atom
  7. 14. a material that electric charge can move through easily
  8. 16. chemical combination of two or more elements in a specific ratio
  9. 18. change: 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
  10. 19. vertical column of elements in the periodic table; elements in a family all have similar chemical properties; also called a family