AP Bio Chapter : Themes in the Study of Life

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Across
  1. 4. Reaction The making and breaking of chemical bonds, leading to changes in the composition of matter
  2. 7. The point at which the reactions offset one another exactly
  3. 8. A subatomic particle with a positive charge
  4. 12. The smallest unit of matter that still retains the properties of an element
  5. 14. The dissolving agent of a solution
  6. 15. A subatomic particle with a negative charge
  7. 16. A starting material in a chemical reaction
  8. 18. A substance that is dissolved in a solution
  9. 19. A substance consisting of two or more different elements combined in a fixed ratio
Down
  1. 1. Electron An electron in the outermost electron shell
  2. 2. Bond A chemical bond resulting from the attraction between oppositely charged ions
  3. 3. A substance that cannot be broken down to other substances by chemical reactions
  4. 5. One of several atomic forms of an element, each with a different number of neutrons
  5. 6. Bond A type of strong chemical bond in which two atoms share one or more pairs of valence electrons
  6. 9. A material resulting from a chemical reaction
  7. 10. Number The sum of protons plus neutrons in the nucleus of an atom
  8. 11. Level The different states of potential energy that electrons have in an atom
  9. 12. Number The number of protons in the nucleus of an atom
  10. 13. Bond A type of weak chemical bond formed when a slightly positive hydrogen atom is attracted to a slightly negative atom
  11. 17. A subatomic particle with no charge