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5 Written questions

4 Multiple choice questions

  1. 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).
  2. the property of a liquid to resist penetration by objects at its interface with the air, due to cohesion between molecules of the liquid.
  3. 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. the 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 True/False questions

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

          

  2. moleculea 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. neutrona 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.

          

  4. polar covalent bonda covalent bond with equal sharing of electrons.

          

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