Key Terms-Chemistry

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Author:
chasteele
ID:
35610
Filename:
Key Terms-Chemistry
Updated:
2010-09-18 18:58:45
Tags:
Chemistry
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Description:
Chemistry Comes Alive
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  1. Electrolyte
    • a substance (as an acid, base, or salt) that when dissolved in a suitable solvent (as water) or when fused becomes an ionic conductor
    • any of the ions (as of sodium, potassium, calcium, or bicarbonate) that in a biological fluid regulate or affect most metabolic processes (as the flow of nutrients into and waste products out of cells)—used especially in biology and biochemistry
  2. Colloid
    • a gelatinous or mucinous substance found in tissues in disease or normally (as in the thyroid)
    • a substance consisting of particles that are dispersed throughout another substance and are too small for resolution with an ordinary light microscope but are incapable of passing through a semipermeable membrane
    • a mixture (as smoke) consisting of a colloid together with the medium in which it is dispersed
  3. Electronegativity
    • charged with negative electricity
    • having a tendency to attract electrons
  4. Activation Energy
    the minimum amount of energy required to convert a normal stable molecule into a reactive molecule—called also energy of activation
  5. Salt
    a crystalline compound NaCl that is the chloride of sodium, is abundant in nature, and is used especially to season or preserve food or in industry—called also common salt, sodium chloride
  6. Mixture
    a product of mixing: as a : a portion of matter consisting of two or more components in varying proportions that retain their own properties b : an aqueous liquid medicine : potion ; specifically : a preparation in which insoluble substances are suspended in watery fluids by the addition of a viscid material (as gum, sugar, or glycerol)
  7. Solvent
    that dissolves or can dissolve <solvent fluids> <solvent action of water>
  8. Catalyst
    a substance (as an enzyme) that enables a chemical reaction to proceed under different conditions (as at a lower temperature) than otherwise possible
  9. Suspension
    • the state of a substance when its particles are mixed with but undissolved in a fluid or solid
    • a substance in this state—see oral suspension
    • a system consisting of a solid dispersed in a solid, liquid, or gas usually in particles of larger than colloidal size
  10. Solute
    a dissolved substance ; especially : a component of a solution present in smaller amount than the solvent
  11. Active Site
    a region especially of a biologically active protein (as an enzyme) where catalytic activity takes place and whose shape permits the binding only of a specific reactant molecule

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