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5 Written questions

4 Multiple choice questions

  1. a particle composed of one or more atoms held together by chemical bonds; the smallest particle of a compound that displays all the properties of that compound.
  2. 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.
  3. a 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. a subatomic particle that is found in the nuclei of atoms, bears no charge, and has a mass approximately equal to that of a proton.

4 True/False questions

  1. non-polar covalent bonda covalent bond with equal sharing of electrons.

          

  2. pH scalea 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. polar covalent bonda covalent bond with equal sharing of electrons.

          

  4. elementa liquid capable of dissolving (uniformly dispersing) other substances in itself.

          

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