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5 Written questions

5 Matching questions

  1. Electronegativity
  2. Covalent Bond
  3. Polar Covalent Bond
  4. Electron Shells
  5. Surface Tension
  1. a The attraction of a given atom for the electrons of a covalent bond.
  2. b An energy level representing the distance of an electron from the nucleus of an atom.
  3. c A covalent bond between atoms that differ in electronegativity. The shared electrons are pulled closer to the more electornegative atom, making it slightly negative and the other atom slightly positive.
  4. d A measure of how difficult it is to stretch or break the surface of a liquid. Water has a high surface tension because of the hydrogen bonding of surface molecules.
  5. e A strong chemical bond in which two atoms share one or more pairs of outer-shell electrons.

5 Multiple choice questions

  1. Anything that occupies space and has mass.
  2. 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. 8
  4. 18
  5. A starting material in a chemical reaction.

5 True/False questions

  1. ElementA subsctance that cannot be broken down to other substance by ordinary chemcial means.

          

  2. 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.

          

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

          

  4. SoluteA compound resulting from the formation of ionic bonds; also called an ionic compound.

          

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