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5 Written questions

5 Matching questions

  1. Chemical Bonds
  2. Evaporative Cooling
  3. Polar Molecule
  4. Electron
  5. Ion
  1. a A molecule containing polar covalent bonds and having an unequal distribution of charges.
  2. b A subatomic particle with a single negative electrical charge. One or more electrons move around the nuclues of an atom.
  3. c An atom or group of atoms that has gained or lost one or more electrongs, thus acquiring a charge.
  4. d An attraction between two atoms resulting from a sharing of outer-shell electrons or the presence of opposite charges on the atoms. The bonded atoms gain complete outer electron shells.
  5. e occurs because the molecules with the greates energy leave.

5 Multiple choice questions

  1. 18
  2. A substance that decreases the hydrogen ion concentration in a solution. 14 is a strong base on the pH scale.
  3. Measures the intensity of heat.
  4. The dissolving agent of a solution. Water is the most versatile solvent known.
  5. Oxygen, carbon, hydrogen, and nitrogen.

5 True/False questions

  1. BuffersA chemical substance that resists changes in pH by accepting hydrogen ions from or donating hydrogen ions to solutions.

    substance that minimize changes in pH.

          

  2. IsotopesA substance that is dissolved in a solution.

          

  3. First shell of an atom can contain how many electrons?2

          

  4. CompoundTwo or more atoms held together by covalent bonds.

          

  5. Aqueous SolutionA solution in which water is the solvent.

          

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