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5 Written questions

5 Matching questions

  1. Radioactive Isotope
  2. Electron Shells
  3. Evaporative Cooling
  4. Chemical Bonds
  5. Solution
  1. a 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.
  2. b A liquid that is a homogeneous mixture of two or more substances.
  3. c occurs because the molecules with the greates energy leave.
  4. d An energy level representing the distance of an electron from the nucleus of an atom.
  5. e An isotope whose nucleus decays spontaneously, giving off particles and energy.

5 Multiple choice questions

  1. 8
  2. An atom's central core, containing protons and neutrons.
  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. One of several atomic forms of an element, each with teh same number of protons but different number of neutrons.
  5. 18

5 True/False questions

  1. What 4 elements make up about 96% of living matter?Neutrons and protons.


  2. MatterAnything that occupies space and has mass.


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


  4. ProductA subatomic particle with a single positive electrical charge, found in the nucleus of an atom.


  5. Chemical ReactionThe making and breaking of chemical bonds, leading to changes in the composition of matter.


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