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Chemistry

CaCO3 + 2HCl [dil.] ⟶ CaCl2 + H2O + CO2 [g]

(a) State the information provided by the above chemical equation.

(b) State the information not conveyed by the above chemical equation.

Chemical Equation

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Answer

(a) Information provided by the equation:

  • One molecule of calcium carbonate reacts with two molecules of [dil.] hydrochloric acid to produce one molecule of calcium chloride, one molecule of water and one molecule of carbon dioxide.
  • The reaction is irreversible.
  • Hydrochloric acid is in dil. form.
  • Carbon dioxide produced is in gaseous form.

(a) Information not provided by the equation:

  • The concentration of the reactants and products.
  • The speed of the reaction
  • Change in colour occurring
  • Completion of the reaction i.e., whether the reaction is complete or not
  • Changes in evolution of light or sound energy during the occurrence of the reaction.

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