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Ch.15 - Chemical Equilibrium
Brown - Chemistry: The Central Science 14th Edition
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Brown 14th EditionCh.15 - Chemical Equilibrium문제 42a
15장, 문제 42a

(a) If Qc > Kc, how must the reaction proceed to reach equilibrium?

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Understand the terms: Qc (reaction quotient) and Kc (equilibrium constant) are both measures of the relative amounts of products and reactants in a reaction mixture. Qc is calculated at any point in time, while Kc is calculated at equilibrium.
Compare Qc and Kc: If Qc > Kc, it means that the concentration of products is greater than what is expected at equilibrium.
Determine the direction of the shift: To reach equilibrium, the reaction must shift in the direction that reduces the concentration of products and increases the concentration of reactants.
Identify the direction: The reaction will proceed in the reverse direction (towards the reactants) to decrease the concentration of products and increase the concentration of reactants.
Conclusion: By shifting towards the reactants, the reaction will eventually reach a state where Qc equals Kc, achieving equilibrium.

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주요 개념

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

Reaction Quotient (Qc)

The reaction quotient, Qc, is a measure of the relative concentrations of products and reactants at any point in a reaction. It is calculated using the same expression as the equilibrium constant (Kc) but with the current concentrations instead of equilibrium concentrations. Qc helps determine the direction in which a reaction will proceed to reach equilibrium.
추천 영상:
가이드 코스
00:49
Reaction Quotient Q

Equilibrium Constant (Kc)

The equilibrium constant, Kc, is a value that expresses the ratio of the concentrations of products to reactants at equilibrium for a given reaction at a specific temperature. It is a fixed value for a particular reaction under defined conditions. Comparing Qc to Kc allows us to predict the direction of the reaction: if Qc < Kc, the reaction will proceed forward, while if Qc > Kc, it will shift backward.
추천 영상:
가이드 코스
03:20
Equilibrium Constant Expressions

Le Chatelier's Principle

Le Chatelier's Principle states that if a system at equilibrium is disturbed by a change in concentration, temperature, or pressure, the system will adjust to counteract the disturbance and restore a new equilibrium. In the context of Qc and Kc, if Qc > Kc, the system will shift to the left, favoring the formation of reactants to reduce the concentration of products and achieve equilibrium.
추천 영상:
가이드 코스
07:32
Le Chatelier's Principle
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교과서 질문

(a) If Qc < Kc, in which direction will a reaction proceed in order to reach equilibrium?

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교과서 질문

At 100°C, the equilibrium constant for the reaction COCl2(𝑔) ⇌ CO(𝑔) + Cl2(𝑔) has the value 𝐾𝑐 = 2.19×10−10. Are the following mixtures of COCl2, CO, and Cl2 at 100°C at equilibrium? If not, indicate the direction that the reaction must proceed to achieve equilibrium.

(a) [COCl2] = 2.00×10−3 M, [CO] = 3.3×10−6 M, [Cl2] = 6.62×10−6 M

(b) [COCl2] = 4.50×10−2 M, [CO] = 1.1×10−7 M, [Cl2] = 2.25×10−6 M

(c) [COCl2] = 0.0100 M, [CO] = [Cl2] = 1.48×10−6 M

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교과서 질문

(b) At the start of a certain reaction, only reactants are present; no products have been formed. What is the value of Qc at this point in the reaction?

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교과서 질문

(b) What condition must be satisfied so that Qc = Kc?

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