Chemistry Crossword Unit B

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Across
  1. 2. change of state from a gas to a solid
  2. 3. catalyst involved in chemical reactions in living things
  3. 5. invisible negatively charged particle that orbits the nucleus of an atom
  4. 8. anything that has mass and occupies space
  5. 10. the sum of the number of protons and neutrons in an atom
  6. 11. 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
  7. 13. group 2 elements in the periodic table; their reactivity is not as strong as that of the alkali metals
  8. 14. substance that helps a chemical reaction to proceed more quickly
  9. 16. group 17 elements in the periodic table; the most reactive non-metals
  10. 18. number of protons in the nucleus of one atom of an element
  11. 19. chemical reaction that occurs when oxygen reacts with a substance to form a new substance and give off energy
  12. 20. chemical reaction that releases energy
  13. 22. orbit of electrons around the nucleus of an atom
  14. 23. group 1 elements in the periodic table; the most reactive of the metals
  15. 26. pure substance formed when at least one metal and one non-metal combine
Down
  1. 1. chemical reaction that takes place in cells; food (sugar) reacts with oxygen to produce energy, water, and carbon dioxide
  2. 4. pure substance that cannot be broken down into other substances; substance made up of only one type of atom
  3. 6. chemical reaction that absorbs energy
  4. 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,
  5. 9. measure of atomic mass; 1 ___ is equal to 1/12th the mass of a carbon 12 atom
  6. 12. energy fundamental principle that energy cannot be created or destroyed
  7. 15. shiny, malleable, ductile element that conducts electricity p
  8. 17. ability of a substance to conduct electricity or heat
  9. 18. a solution in which water is the solvent
  10. 21. system an experiment in which all reactants and all products of a chemical reaction are accounted for; no substance can escape nor enter the area in which the reaction is occurring in
  11. 24. change of state from a gas to a liquid
  12. 25. chemical combination of two or more elements in a specific ratio