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5 Written Questions

5 Matching Questions

  1. Electron Shells
  2. Base
  3. Isotopes
  4. Hydrogen Bonds
  5. Molecule
  1. a An energy level representing the distance of an electron from the nucleus of an atom.
  2. b 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).
  3. c Two or more atoms held together by covalent bonds.
  4. d One of several atomic forms of an element, each with teh same number of protons but different number of neutrons.
  5. e A substance that decreases the hydrogen ion concentration in a solution. 14 is a strong base on the pH scale.

5 Multiple Choice Questions

  1. The sum of the number of protons and neutrons in an atom's nucleus.
  2. A liquid that is a homogeneous mixture of two or more substances.
  3. A subsctance that cannot be broken down to other substance by ordinary chemcial means.
  4. A substance that is dissolved in a solution.
  5. The total mass of an atom; also called atomic weight. Given as a whole number, the atomic mass approximately equals the mass number.

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. Surface TensionA 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.

          

  3. AcidThe smallest unit of matter that retains the properties of an element.

          

  4. NeutronA subatomic particle having no electrical charge, found in the nucleus of an atom.

          

  5. ProtonAn ending material in a chemical reaction.

          

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