Reversible Reactions and Equilibrium

Question 1

Consider the following chemical reaction:2CH4(g) C2H2(g) + 3H2(g)Describe what is happening within the system when it is at equilibrium in terms of concentrations, reactions that occur, and reaction rates.

Revolt · Accepted Answer

The system is in dynamic equilibrium: CH4 is decomposing into C2H2 and H2 while C2H2 and H2 react to form CH4. Both reactions continue at equal rates, so the concentrations of all substances remain constant.

Question 2

Which of these did your answer include?

Revolt · Accepted Answer

The equilibrium in the system is a dynamic equilibrium.; At equilibrium, the rate of the forward reaction (CH4 decomposing into C2H2 and H2) is equal to the rate of the reverse reaction (C2H2 and H2 reacting to form CH4).; At equilibrium, the concentrations of all substances are not changing.; At equilibrium, both the forward and reverse reactions are still occurring.

Question 3

Identify the correct equilibrium constant expression for this equation: 2 upper N upper O (g) plus upper O subscript 2 (g) double-headed arrow 2 upper N upper O subscript 2 (g).

Revolt · Accepted Answer

Answer image: //media.edgenuity.com/EVresources/3210-09-08-20-03-task/mc001-3.jpg

Question 4

Identify the correct equilibrium constant expression for this equation: Upper C subscript 6 upper H subscript 12 upper O subscript 6 (s) plus 6 upper O subscript 2 (g) double-headed arrow 6 upper C upper O subscript 2 (g) plus 6 upper H subscript 2 upper o (g).

Revolt · Accepted Answer

Answer image: //media.edgenuity.com/EVresources/3210-09-08-20-03-task/mc002-4.jpg

Question 5

Although I2 is the stable form of iodine at low temperatures, at high temperatures the molecule can dissociate: Upper I subscript 2 (g) double-headed arrow 2 upper I (g). What is the equilibrium constant expression for this system?

Revolt · Accepted Answer

Answer image: //media.edgenuity.com/EVresources/3210-09-08-20-04-task/mc001-2.jpg

Question 6

At equilibrium at 1200°C, [I2] = 9.5 ×10–2 Mand [I] = 3.2 × 10–2 M.What is the value of Keq for this system?

Revolt · Accepted Answer

1.1 × 10–2

Question 7

Question 7

Revolt · Accepted Answer

,: left; reactants.

Question 8

In this system, the equilibrium lies to the ✔ leftright,

Revolt · Accepted Answer

✔ left; ,: left; reactants.

Question 9

and the reaction favors the ✔ reactants.products.

Revolt · Accepted Answer

✔ reactants.

Question 10

Ammonium hydrogen sulfide (NH4HS) can decompose to ammonia and hydrogen sulfide: Upper N upper H subscript 4 upper H upper S (s) double-headed arrow upper N upper H subscript 3 (g) plus Uppe H subscript 2 upper S (g). What is the equilibrium constant expression for this system?

Revolt · Accepted Answer

Answer image: //media.edgenuity.com/EVresources/3210-09-08-20-05-task/mc001-3.jpg

Reversible Reactions and Equilibrium Answers

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