Chemistry in Biology

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Across
  1. 7. A pure substance that cannot be broken down by physical means that contains more than one element
  2. 9. The beginning portion of a chemical reaction
  3. 10. __________-12 is used to date substances that have once been alive
  4. 11. The neutral part of an atom
  5. 12. __________ Isotopes are broken down by radiation when the nucleus of an atom breaks up
  6. 14. Carbon ____________ happens when nitrogen becomes carbon through beta decay
  7. 16. Atoms of the same element that have the same number of protons and electrons but have a different number of neutrons
  8. 17. Neutrons and Protons are located in the __________
  9. 19. A pure substance that cannot be broken down by physical means and found on a table
Down
  1. 1. The positively charged part of an atom
  2. 2. Part of the atom located on the outside of the nucleus
  3. 3. The result of a chemical reaction
  4. 4. The study of matter
  5. 5. ____________ bonds occur when electrons are shared
  6. 6. Are the process by which atoms or groups of atoms in substances are reorganized into different substances
  7. 8. ________ bonds occur when electrons are transferred
  8. 13. ____________ = Atoms
  9. 15. A compound in which the atoms are held together by covalent bonds.
  10. 18. The building blocks of matter