2: The Chemistry of Life

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kristajrco8
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53461
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2: The Chemistry of Life
Updated:
2010-12-05 13:11:12
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2.1 & 2.2
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  1. basic unit of matter
    atom
  2. the center of the atom which contains the protons and neutrons: in cells, structure that contains the cells structure that contains the cell's genetic material (DNA) and controls the cell's activity
    nucleus
  3. negatively charged particle; located outside the atomic nucleus
    electron
  4. substance consisting entirely of one type of atom
    element
  5. atom of an element that has a number of neutrons different from that of other atoms of the same element
    isotope
  6. substance formed by the chemical combination of tow or more elements in definite proportions
    compound
  7. bond formed when one or more electrons are transferred from one atom to another
    ionic bond
  8. atom that has a positive or negative charge
    ion
  9. bond formed by the sharing of electrons between atoms
    covalent bond
  10. smallest unit of most compounds
    molecule
  11. a slight attraction that develops between the oppositely charged regions of nearby moluecules
    Van der Waals forces
  12. attraction between molecules of the same substance
    cohesion
  13. attraction between molecules of different substances; in plants, attraction between unlike molecules
    adhesion
  14. material composed of two or more elements or compounds that are physically mixed together but not chemically combined
    mixture
  15. mixture of two or more substances in which the molecules of the substances are evenly distributed
    solution
  16. substance that is dissolved in a solvent to make a solution
    solute
  17. substance in which a solute is dissolved to form a solution
    solvent
  18. mixture of water and nondissolved materials
    suspensions
  19. measurement system used to indicate the concentration of hydrogen ions (H+) in solution; ranges from 0 to 14
    pH scale
  20. compound that forms hydrogen ions (H+) in solution
    acid
  21. compound that produces hydroxide ions (OH+) in solution
    base
  22. weak acid or base that can react with strong acids or bases to help prevent sharp, sudden changes in pH
    buffer

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