BIO CH. 2 CROSSWORD

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Across
  1. 2. Protons and electrons are negatively _____
  2. 6. A starting mateiral in a chemical reaction.
  3. 7. Compound consisting of hydrogen and oxygen in a 2:1 ratio
  4. 9. Chemical ____ is when in a reversible chemical reaction, the point at which the rate of the forward reaction equals the rate of the reverse reaction.
  5. 10. The number of protons is called the ____ number
  6. 12. ___ electrons are the electrons in the outermost shell.
  7. 14. Smallest unit of matter
  8. 16. Different atomic forms of the same element are called _____
  9. 17. The attraction of an atom for the electrons of a covalent bond.
  10. 18. A measure of mass for atoms and subatomic particles.
  11. 19. An ending material in a chemical reaction.
Down
  1. 1. Two or more atoms held together by covalent bonds.
  2. 3. ____ elements are required by an organism in only minute quantities.
  3. 4. What are all organisms composed of?
  4. 5. A ____ reaction is a process leading to chemical changes in matter; involves the making and/or breaking of chemical bonds.
  5. 8. Substance that cannot be broken down.
  6. 11. An atom that has gained or lost electrons, thus acquiring a charge.
  7. 13. Substance containing 2 or more elements.
  8. 15. A ____ bond is a type of strong chemical bond in which two atoms share one pair of valence electrons.
  9. 17. The capacity to cause change.