Question

Во сколько раз изменится скорость гомогенной реакции 2А+ВС, если концентрацию вещества В увеличить в 4 раза, а концентрацию вещества А уменьшить в 2 раза.

Answer 1

Никак не изменится, так как по уравлению скорости р-и V прямопропорциональна [A]^2*[B], после изменения концентрация стало [0,5A]^2*[4B]=> 0,5^2*4=1

 

Answer 2

Calculation of the Change in Reaction Rate

To calculate the change in the reaction rate of the homogeneous reaction 2A + 2B -> C, we need to consider the effect of changing the concentrations of substances A and B.

Let's assume that the initial rate of the reaction is given by the rate equation:

Rate = k[A]^m[B]^n

Where: - k is the rate constant - [A] and [B] are the concentrations of substances A and B, respectively - m and n are the reaction orders with respect to A and B, respectively

In this case, since the reaction is homogeneous and involves the same substances A and B, we can assume that the reaction orders for A and B are the same. Let's assume m = n = x.

Now, let's consider the given scenario where the concentration of substance B is increased by a factor of 4 (4 times) and the concentration of substance A is decreased by a factor of 2 (2 times).

The new concentrations of substances A and B can be expressed as:

[A] = [A]_initial / 2 [B] = [B]_initial * 4

To determine the change in the reaction rate, we can compare the initial rate with the new rate:

Change in Rate = (New Rate - Initial Rate) / Initial Rate

To calculate the new rate, we need to substitute the new concentrations into the rate equation:

New Rate = k([A]_initial / 2)^x([B]_initial * 4)^x

Now, let's substitute the values into the equation and simplify:

New Rate = k([A]_initial / 2)^x([B]_initial * 4)^x

New Rate = k([A]_initial^x / 2^x)([B]_initial^x * 4^x)

New Rate = k([A]_initial^x * [B]_initial^x * 4^x) / (2^x)

New Rate = (4^x / 2^x) * k([A]_initial^x * [B]_initial^x)

New Rate = 2^x * k([A]_initial^x * [B]_initial^x)

Now, we can calculate the change in rate:

Change in Rate = (2^x * k([A]_initial^x * [B]_initial^x) - Initial Rate) / Initial Rate

Since we don't have the specific values for the rate constant and the initial rate, we cannot calculate the exact change in rate. However, we can see that the change in rate will depend on the values of x, the reaction orders with respect to A and B, as well as the initial concentrations of A and B.

Please note that the above calculation is a general approach based on the given information. To obtain a more accurate result, specific values for the rate constant, reaction orders, and initial concentrations are required.