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5 Written questions

5 Matching questions

  1. Hydrogen Bonds
  2. Proton
  3. Aqueous Solution
  4. Chemical Bonds
  5. Buffers
  1. a A subatomic particle with a single positive electrical charge, found in the nucleus of an atom.
  2. b 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.
  3. c A type of weak chemical bond formed when the partially positive hydrogen atom participating in a polar covalent bond in one molecule is attracted to the partially negative atom participating in a polar covalent bond in another molecule (or in another region of the same molecule).
  4. d A chemical substance that resists changes in pH by accepting hydrogen ions from or donating hydrogen ions to solutions.

    substance that minimize changes in pH.
  5. e A solution in which water is the solvent.

5 Multiple choice questions

  1. The smallest unit of matter that retains the properties of an element.
  2. The making and breaking of chemical bonds, leading to changes in the composition of matter.
  3. A strong chemical bond in which two atoms share one or more pairs of outer-shell electrons.
  4. An atom's central core, containing protons and neutrons.
  5. One of several atomic forms of an element, each with teh same number of protons but different number of neutrons.

5 True/False questions

  1. Acid PrecipitationRain, snow or fog that is more acidic than pH 5.2.


  2. SolutionA liquid that is a homogeneous mixture of two or more substances.


  3. Evaporative Coolingoccurs because the molecules with the greates energy leave.


  4. Ocean AcidificationRain, snow or fog that is more acidic than pH 5.2.


  5. CohesionThe sticking together of molecules of the same kind, often by hydrogen bonds.