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5 Written Questions

5 Matching Questions

  1. Nucleus
  2. Adhesion
  3. Element
  4. Polar Covalent Bond
  5. First shell of an atom can contain how many electrons?
  1. a The attraction between different kinds of molecules.
  2. b A subsctance that cannot be broken down to other substance by ordinary chemcial means.
  3. c An atom's central core, containing protons and neutrons.
  4. d 2
  5. e 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.

5 Multiple Choice Questions

  1. 8
  2. An atom or group of atoms that has gained or lost one or more electrongs, thus acquiring a charge.
  3. The smallest unit of matter that retains the properties of an element.
  4. A substance that increases the hydrogen ion concentration in a solution. 0 on pH scale is a strong acid.
  5. A starting material in a chemical reaction.

5 True/False Questions

  1. What 4 elements make up about 96% of living matter?Oxygen, carbon, hydrogen, and nitrogen.

          

  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. MoleculeTwo or more atoms held together by covalent bonds.

          

  4. Ocean AcidificationThe making and breaking of chemical bonds, leading to changes in the composition of matter.

          

  5. The nucleus of an atom contains...??Neutrons and protons.

          

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