D.I. Mendeleev A.M.Butlerov

The velocity of chemical reactions
Table of content


  1. As a result of a reaction 4,5 g of water was formed. As a result of other reaction under the same conditions 5,1 g of hydrogen sulphide was formed . Which reaction has greater velocity?

  2. In how many times will decrease the velocity of simple reaction A + 2B = C when half of substance A will react, in comparison with initial speed? Initial concentrations: 1 mol/litre for substance A and 3 mol/litre for substance B and no C.

  3. At 18oC dissolution of a sample of zinc sulfide in a hydrochloric acid comes to an end in 2,25 minutes, and at 38oC the same sample dissolves in the acid in 0,25 minutes. How much time is needed to dissolve the given sample at 48oC?

  4. In which case the velocity of reaction is greater: at heating from 0oC up to 11oC or at heating from 11oC up to 22oC? Prove the answer using Arrenius equation.

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