The following pictures represent the composition of the equi- librium mixture for the reaction A + B ∆ AB at 300 K and at 400 K.
Is the reaction exothermic or endothermic? Explain using Le Châtelier's principle.

검증된 단계별 안내

Step 1: Identify the reaction and the components involved: A + B ⇌ AB.

Step 2: Observe the molecular representations at 300 K and 400 K. Note the number of reactants (A and B) and products (AB) at each temperature.

Step 3: Compare the concentrations of reactants and products at the two temperatures. At 300 K, there are more AB molecules compared to 400 K.

Step 4: Apply Le Châtelier's principle: If the concentration of products decreases with an increase in temperature, the reaction shifts to the left (towards reactants) to counteract the change.

Step 5: Conclude that the reaction is exothermic because increasing the temperature shifts the equilibrium towards the reactants, indicating that heat is a product of the reaction.

비슷한 문제에 대한 검증된 영상 답변:

이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.

영상 길이:

주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Chemical Equilibrium

Chemical equilibrium occurs when the rates of the forward and reverse reactions are equal, resulting in constant concentrations of reactants and products. In the context of the reaction A + B ⇌ AB, the equilibrium position can shift based on changes in temperature, pressure, or concentration, affecting the amounts of A, B, and AB present in the mixture.

Le Châtelier's Principle

Le Châtelier's principle states that if a dynamic equilibrium is disturbed by changing the conditions, the system will adjust to counteract the change and restore a new equilibrium. For example, if the temperature of an exothermic reaction is increased, the equilibrium will shift to favor the reactants, while a decrease in temperature will favor the formation of products.

Exothermic vs. Endothermic Reactions

Exothermic reactions release heat to the surroundings, resulting in an increase in temperature, while endothermic reactions absorb heat, leading to a decrease in temperature. The nature of the reaction can be inferred from the effect of temperature changes on the equilibrium position, where an increase in temperature favors the endothermic direction and a decrease favors the exothermic direction.

The following pictures represent the composition of the equi- librium mixture for the reaction A + B ∆ AB at 300 K and at 400 K. Is the reaction exothermic or endothermic? Explain using Le Châtelier's principle.