Biology3 ch2

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Biology3 ch2
2012-02-19 17:17:00
Biology3 ch2

Biology3 ch2
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  1. atom
    basic structural unit of matter
  2. atomic number
    number of protons in the nucleus
  3. electron
    negatively charged subatomic particle
  4. element
    a substance that cannot be broken down
  5. isotope
    atoms of the same element with different numbers of neutrons
  6. atomic mass
    total number of protons and neutrons in the nucleus
  7. neutron
    uncharged subatomic particle
  8. nucleus
    core of an atom; occupied by protons and neutrons
  9. proton
    positively charged subatomic particle
  10. ion
    atom that carries a charge because it has an unequal number of protons and electrons
  11. chemical bond
    an attractive force that arises between two atoms when their electrons interact
  12. molecule
    a union of two or more atoms joined in a chemical bond
  13. compound
    type of molecule that has atoms of more than one element
  14. ionic bond
    type of chemical bond in which a strong mutual attraction forms between ions of opposite charge
  15. covalent bond
    chemical bond in which two atoms share a pair of electrons
  16. nonpolar
    having an even distribution of charge
  17. polar
    having an uneven distribution of charge; a molecule that has an equal number of protons and electrons, but an uneven distribution of electrons across the molecule
  18. polarity
    any separation of charge into distinct positive and negative regions
  19. hydrogen bond
    attraction that forms between a covalently bonded hydrogen atom and another atom taking part in a separate covalent bond
  20. solvent
    liquid that can dissolve other substances
  21. solute
    a dissolved substance
  22. pH
    measure of the number of hydrogen ions in a fluid
  23. hydrophilic
    describes a substance that dissolves easily in water
  24. hydrophobic
    describes a substance that resists dissolving in water
  25. temperature
    measure of molecular motion
  26. cohesion
    tendency of molecules to stick together