Question

1. Chemical equilibrium is established when the number of reactants equals the number of products.. . - True. - False. . 2. According to Le Chatelier's principle, by increasing the temperature of the system shown below, the equilibrium will shift to the right (towards products).. . A + B heat + AB. . - True. - False. . 3. For which of the following reactions will an increase in pressure not effect the position of equilibrium?. . . A. 2A2 (g) + B2 (g) 2A2B (g). . B. 2AB (g) A2 (g) + B2 (g). . C. 2A (g) + F2 (g) 2AF (g). . D. 2B (s) + 2HA (aq) 2BA (aq) + H2 (g). .

Answer 1

1)false a in chemical equilibrium concentration of reactant is equal to concentration of product
 2)as here they said heat is added in product side means its endothermic reaction and in endothermic reaction on increasing temp. equilibrium shift towards forward direction so its true
 3) B)as here mole are equal in reactant and product side that is 2 and if we increase pressure equilibrium shift in dat direction where no. of moles are less and here mole are equal so it will remain unaffected

Answer 2

Answer: 1. False

2. False

3. $2AB_2(g)\rightarrow 2A_2(g)+B_2(g)$

Explanation:

1. Chemical equilibrium are attained is closed system.

The macroscopic properties remain constant like: volume, pressure, energy etc.  Rate of forward reaction is equal to the rate of backward reaction.

The concentration of the reactants and products remain constant.They are not always equal.

2. $A+B\rightleftharpoons heat+AB$

By increasing the temperature:

If the temperature is increased, so according to the Le-Chatelier's principle , the equilibrium will shift in the direction where decrease in temperature occurs. As, this is an exothermic reaction, backward reaction will decrease the temperature. Hence, the equilibrium will shift in the left direction (i.e. towards reactants.)

3. If the pressure of the container is increased, the pressure will decrease according to Boyle's Law. Now, according to the Le-Chatelier's principle, the equilibrium will not shift in any direction when the number of moles of gas molecules is equal at the product side and the reactant side.

$2AB_2(g)\rightleftharpoons 2A_2(g)+B_2(g)$