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Reactions and Periodicity: Free-Response Questions for AP Chemistry (page 2)

By — McGraw-Hill Professional
Updated on Feb 1, 2011

Second Free-Response Question

  1. Sr + 2 H2O → Sr2+ + 2 OH + H2
  2. The resulting solution is basic owing to the presence of the hydroxide ion. The phenolphthalein indicator is pink in basic solutions, so the solution would be pink.

    You get 1 point for the correct formulas for the reactants and products and 1 point for the correct coefficients in the balanced equation. Answering the associated question correctly is worth 1 point.

  3. MnO2 + 4 H+ + 2 Cl → Mn2+ + Cl2 + 2 H2O
  4. Chlorine is being oxidized from -1 in the chloride ion to 0 in diatomic chlorine gas.

    You get 1 point for the correct formulas for the reactants and products and 1 point for the correct coefficients in the balanced equation. Answering the associated question correctly is worth 1 point.

  5. Pb2+ + SO4 2– → PbSO4
  6. The spectator ions are the nitrate ions (NO3) and the ammonium ions (NH4+).

    You get 1 point for the correct formulas for the reactants and products and 1 point for the correct coefficients in the balanced equation. Answering the associated question correctly is worth 1 point.

    There is a maximum of 9 points possible.

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