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5 Written Questions

5 Matching Questions

  1. Compound
  2. Buffers
  3. Matter
  4. Atomic Mass
  5. Evaporative Cooling
  1. a 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.
  2. b The total mass of an atom; also called atomic weight. Given as a whole number, the atomic mass approximately equals the mass number.
  3. c a substance consisting of two or more different elements combined in a fixed ratio.
  4. d Anything that occupies space and has mass.
  5. e occurs because the molecules with the greates energy leave.

5 Multiple Choice Questions

  1. 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.
  2. A subsctance that cannot be broken down to other substance by ordinary chemcial means.
  3. 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.
  4. A substance that decreases the hydrogen ion concentration in a solution. 14 is a strong base on the pH scale.
  5. A compound resulting from the formation of ionic bonds; also called an ionic compound.

5 True/False Questions

  1. SolventThe dissolving agent of a solution. Water is the most versatile solvent known.

          

  2. Chemical ReactionAn 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. pH ScaleA scale we used to describe how acidic or basic a solution is. The scale ranges from 0-14, 0 being the most acidic and 14 being the most basic. 7 is neutral (pure water)

          

  4. Acid PrecipitationDecreasing pH of ocean waters due to absoprtion of excess atmospheric CO2 from the burning of fossil fuels.

          

  5. IonThe smallest unit of matter that retains the properties of an element.

          

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