اختبار الثاني عشر ( الاتزان الكيميائي )

When the concentration of one of the reactants in a balanced system increases, the position of equilibrium shifts in the direction of the reaction that reduces the concentration of the added substance. This is known as Le Chatelier's principle. According to this principle, if the concentration of a substance is increased, the reaction will shift in the direction that consumes or reduces the concentration of that substance in order to restore equilibrium. Therefore, the statement "True" is correct in this context.

When the temperature of an equilibrium heat-absorbing system is lowered, the reaction rate decreases rather than increases. This is because decreasing the temperature reduces the kinetic energy of the molecules, resulting in a decrease in the frequency of successful collisions between reactant molecules. As a result, the reaction rate decreases.

By increasing the temperature, the equilibrium position of the reaction will shift towards the products according to Le Chatelier's principle. This means that more ethene will be produced.

In the given balanced equation, 5CO(g) + I2O5(g) ⇌ I2(g) + 5CO2(g), increasing the concentration of iodine (I2) will not shift the position of equilibrium towards the formation of the products. According to Le Chatelier's principle, increasing the concentration of a reactant will shift the equilibrium to the side of the reaction that consumes the reactant. In this case, increasing the concentration of iodine (I2) will shift the equilibrium towards the reactants side, not the products side. Therefore, the statement is false.

When the concentration of iodine increases in the given equilibrium system, the position of equilibrium shifts towards the formation of the product (hydrogen iodide). This means that the concentration of hydrogen iodide increases while the concentrations of hydrogen gas and iodine gas decrease. However, the value of the equilibrium constant remains constant as long as the temperature is constant. Therefore, all the statements are true except for the statement "the value of the equilibrium constant increases."