1) The velocity of chemical reaction is characterized by?
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| change of substances amounts for a time unit in unit of volume or unit of the area;
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| time for which chemical reaction comes to an end;
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| the number of reagent's structural units participating the chemical reaction;
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| the relative movement of the reagent's molecules or ions.
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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?
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| in 3 times;
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| in 6 times;
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| in 9 times;
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| in 27 times.
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3) In how many times increases the velocity of elementary reaction
2A + B = 2C, if concentration of A decreases in 2 times?
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| increases in 4 times;
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| decreases in 4 times ;
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| increases in 2 times;
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| decreases in 2 times.
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4) The velocity of direct reaction N2 + 3H2 = 2NH3 + Q increases if?
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| the concentration of nitrogen increases;
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| the concentration of nitrogen decreases;
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| the concentration of ammonia increases;
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| the concentration of ammonia decreases.
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5) How will affect 3 times increase of the pressure on the velocity of given reaction MgCO3 = MgO + CO2?
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| velocity increases in 3 times;
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| velocity decreases in 9 times;
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| velocity decreases in 3 times;
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| velocity doesn't change.
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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?
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| velocity increases in 2 times;
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| velocity decreases in 4 times;
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| velocity decreases in 2 times;
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| velocity doesn't change.
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7) In which case the 2-time increase of the pressure doesn't influence the reaction rate?
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| H2 + I2 = 2HI;
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| C + O2 = CO2;
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| 2NH3 = N2 + 3H2;
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| Fe + CuSO4 = Cu + FeSO4.
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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?
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| Pb and HCl;
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| Fe and HCl;
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| Zn and HCl;
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| Mg and HCl.
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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?
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| in 2 times;
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| in 4 times;
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| in 8 times;
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| in 20 times.
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10) If temperature increases from 20oC to 50oC the velocity of reaction increases in 8 times. What the temperature coefficient is equal?
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| 8;
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| 4;
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| 3;
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| 2.
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| 11) The chemical reaction rate between copper and nitric acid depends on…
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| mass of copper;
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| volume of acid;
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| concentration of acid;
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| volume of retort.
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| 12) The velocity of chemical reaction between metal and sulfur does not depends on?
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| temperature;
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| surface of contact;
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| pressure;
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| character of metal.
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| 13) Which reaction has the lowest velocity?
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| between an iron nail and 4% solution of CuSO4;
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| between an iron cutting and 4% solution of CuSO4;
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| between an iron nail and 10% solution of CuSO4;
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| between an iron cutting and 10% solution of CuSO4.
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| 14) The velocity of chemical reaction H2 + I2 = 2HI does not depends on?
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| overall volume of gas mixture;
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| pressure of hydrogen;
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| temperature of gas mixture;
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| pressure of iodine.
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| 15) The velocity of reaction in solution CH3COOCH3 + H2O = CH3COOH + CH3OH?
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| presence of catalyst;
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| concentrations of interacting substances;
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| atmosphere pressure;
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| temperature of solution.
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| 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?
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| 10;
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| 30;
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| 50;
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| 100.
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