Chemical Reactions Lab

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Chemical Reactions Lab
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A. Synthesis (Combination)

• A1 Magnesium combines with oxygen.

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Mg O2 ? MgO
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Magnesium (Mg)
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Mg reaction with oxygen
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B. Decomposition

• B1 Hydrogen Peroxide (H2O2) decomposes.

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Hydrogen Peroxide
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H2O2 ? H2 O2

• This reaction occurs very slowly and so we use a
  catalyst to speed up the reaction.
• Catalysts are chemicals.
• MnO2 will be used as a catalyst in this reaction
• Catalysts are written above the arrow in a
  chemical equation.

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MnO2 Catalyst
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Test for O2

• Insert a glowing splint. If it relights then
  O2 is present.

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Test for H2

• Hydrogen will explode when exposed to a flame

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B. Decomposition

• B2 Copper(II) Carbonate decomposes when heated.

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• CuCO3 ? CuO CO2

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Copper(II) Carbonate
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Copper(II) Oxide
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Limewater Test for CO2

• Lime water will turn cloudy when CO2 is bubbled
  through it.

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Combustion

• B3 Methane is burned
• CH4 O2 ? CO2 H2O

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CH4 O2 ? CO2 H2O
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C. Single Replacement

• C1 Zinc is added to Hydrochloric acid (HCl)

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• Zn HCl ? H2 ZnCl2

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Zinc Hydrochloric Acid
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Highly Exothermic
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ZnCl2 is a clear solution however due to
impurities in the zinc it may appear as a grayish
solution with black specks.
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Synthesis (Combination)

• C2 Hydrogen and Oxygen Gas Combine
• Test for Hydrogen (Explosion)

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H2 O2 ? H2O
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C. Single Replacement

• C3 Aluminum metal is added to a solution of
  copper(II) chloride.

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Al CuCl2(aq) ? Cu AlCl3(aq)
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Aluminum CuCl2(aq)
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Al CuCl2(aq) ? Cu AlCl3(aq)
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D. Double Replacement

• D1 Solutions of sodium iodide and lead(II)
  nitrate are mixed.

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Precipitate Formation

• NaI(aq) Pb(NO3)2(aq) ? NaNO3(aq) PbI2?

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PbI2 Precipitate
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D. Double Replacement

• D2 Solutions of silver nitrate and sodium
  chromate are mixed.

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Precipitate Formation

• AgNO3(aq) Na2CrO4(aq) ?
• NaNO3(aq) Ag2CrO4?

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Ag2CrO4 Precipitate
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Homework

• Lab Summary for the Chemical Reactions Lab due
  tomorrow.