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5 Written questions

4 Multiple choice questions

  1. a covalent bond with unequal sharing of electrons, such that one atom is relatively negative and the other is relatively positive.
  2. a scale, with values from 0 to 14, used for measuring the relative acidity of a solution; at pH 7 a solution is neutral, pH 0 to 7 is acidic, and pH 7 to 14 is basic; each unit on the scale represents a tenfold change in concentration.
  3. a charged atom or molecule; an atom or molecule that has either an excess of electrons (and hence is negatively charged) or has lost electrons (and is positively charged).
  4. a region within which electrons orbit that corresponds to a fixed energy level at a given distance from the atomic nucleus of an atom.

4 True/False questions

  1. protona subatomic particle that is found in the nuclei of atoms, bears a unit of positive charge, and has a relatively large mass, roughly equal to the mass of the neutron.


  2. solventa liquid capable of dissolving (uniformly dispersing) other substances in itself.


  3. hydrogen bondthe weak attraction between a hydrogen atom that bears a partial positive charge (due to polar covalent bonding with another atom) and another atom, normally oxygen or nitrogen, that bears a partial negative charge; hydrogen bonds may form between atoms of a single molecule or of different molecules.


  4. elementa substance that cannot be broken down, or converted, to a simpler substance by ordinary chemical means.


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