D.I. Mendeleev A.M.Butlerov

The velocity of chemical reactions
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Tests

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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?
8;
4;
3;
2.

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?
temperature;
surface of contact;
pressure;
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?
10;
30;
50;
100.



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