D.I. Mendeleev A.M.Butlerov

The velocity of chemical reactions
Table of content


Please, enter your registration information


1) The velocity of chemical reaction is characterized by?
change of substances amounts for a time unit in unit of volume or unit of the area;
time for which chemical reaction comes to an end;
the number of reagent's structural units participating the chemical reaction;
the relative movement of the reagent's molecules or ions.

2) For chemical process FeO(s) + H2(g) = Fe(s) + H2O point out, in how many times decreases the velocity of direct reaction if concentration of hydrogen decreases in 3 times?
in 3 times;
in 6 times;
in 9 times;
in 27 times.

3) In how many times increases the velocity of elementary reaction
2A + B = 2C, if concentration of A decreases in 2 times?
increases in 4 times;
decreases in 4 times ;
increases in 2 times;
decreases in 2 times.

4) The velocity of direct reaction N2 + 3H2 = 2NH3 + Q increases if?
the concentration of nitrogen increases;
the concentration of nitrogen decreases;
the concentration of ammonia increases;
the concentration of ammonia decreases.

5) How will affect 3 times increase of the pressure on the velocity of given reaction MgCO3 = MgO + CO2?
velocity increases in 3 times;
velocity decreases in 9 times;
velocity decreases in 3 times;
velocity doesn't change.

6) How will affect 2 times increase of the pressure on the velocity of given reaction, if it is considered as elementary SrO + CO2 = SrCO3?
velocity increases in 2 times;
velocity decreases in 4 times;
velocity decreases in 2 times;
velocity doesn't change.

7) In which case the 2-time increase of the pressure doesn't influence the reaction rate?
H2 + I2 = 2HI;
C + O2 = CO2;
2NH3 = N2 + 3H2;
Fe + CuSO4 = Cu + FeSO4.

8) What pair of substances will interact with greater velocity if it is known, that concentrations of solutions of acids in all cases are equal?
Pb and HCl;
Fe and HCl;
Zn and HCl;
Mg and HCl.

9) How many times does the chemical reaction rate decrease at the temperature fall from 20oC to 0oC if the temperature coefficient is equal to 2?
in 2 times;
in 4 times;
in 8 times;
in 20 times.

10) If temperature increases from 20oC to 50oC the velocity of reaction increases in 8 times. What the temperature coefficient is equal?

11) The chemical reaction rate between copper and nitric acid depends onů
mass of copper;
volume of acid;
concentration of acid;
volume of retort.

12) The velocity of chemical reaction between metal and sulfur does not depends on?
surface of contact;
character of metal.

13) Which reaction has the lowest velocity?
between an iron nail and 4% solution of CuSO4;
between an iron cutting and 4% solution of CuSO4;
between an iron nail and 10% solution of CuSO4;
between an iron cutting and 10% solution of CuSO4.

14) The velocity of chemical reaction H2 + I2 = 2HI does not depends on?
overall volume of gas mixture;
pressure of hydrogen;
temperature of gas mixture;
pressure of iodine.

15) The velocity of reaction in solution CH3COOCH3 + H2O = CH3COOH + CH3OH?
presence of catalyst;
concentrations of interacting substances;
atmosphere pressure;
temperature of solution.

16) Temperature coefficient equals 2. The rate of reaction equals V1 at 20oC. At what temperature (in Celsius degrees oC) will the reaction rate change so V2 = 8V1?

The site is supported by Russian Foundation for Basic Research
  The using of published on this page materials is not allowed without special permission
Copyright (C) Chemisty Department of Moscow State University
Web-Editor: B.I.Pokrovskii
Web-design: Copyright (C) I. Minyaylova and V. Minaylov

Up to Chemistry Department Up to Chemistry Department