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5 Written Questions

5 Matching Questions

  1. Polar Covalent Bond
  2. Trace elements
  3. Atom
  4. Molecule
  5. First shell of an atom can contain how many electrons?
  1. a 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. b an element that is essential for life but required in extremely minute amounts.
  3. c Two or more atoms held together by covalent bonds.
  4. d The smallest unit of matter that retains the properties of an element.
  5. e 2

5 Multiple Choice Questions

  1. A solution in which water is the solvent.
  2. The sticking together of molecules of the same kind, often by hydrogen bonds.
  3. An ending material in a chemical reaction.
  4. 18
  5. A starting material in a chemical reaction.

5 True/False Questions

  1. ElectronA subatomic particle with a single negative electrical charge. One or more electrons move around the nuclues of an atom.

          

  2. Atomic MassThe smallest unit of matter that retains the properties of an element.

          

  3. SolutionA substance that is dissolved in a solution.

          

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

          

  5. BaseA substance that decreases the hydrogen ion concentration in a solution. 14 is a strong base on the pH scale.

          

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