For this reaction at equilibrium, which combination of temperature and pressure would give the greatest equilibrium yield of products? W(g) + X(g) ⇌ 2Y(g) + Z(g) ∆ H = +47 kJ mol –1

Low pressure and high temperature

High pressure and high temperature

High pressure and low temperature

Low pressure and low temperature

The forward reaction in this equilibrium is endothermic COCl 2 (g) ⇌ CO(g) + Cl 2 (g) Which statement is correct?

Raising the temperature from 373 K to 473 K will increase the value of the equilibrium constant

If the total pressure is increased at constant temperature, the proportion of COCl 2 in the equilibrium mixture will decrease

Use of a catalyst will increase the proportion of COCl 2 in the equilibrium mixture at constant temperature and pressure

Reducing the equilibrium concentration of CO will increase the value of the equilibrium constant

The following equilibrium was established in a container with volume V cm 3 at 393 K and 200 kPa. M 2 (g) + R(g) ⇌ RM 2 (g) Δ H = +150 kJ mol −1 Which change would increase the yield of RM 2 ?

change the temperature to 293 K

change the volume of the vessel to 2V cm 3

A pale brown mixture of NO 2 and N 2 O 4 is allowed to reach equilibrium in a sealed gas syringe according to the following equation. 2NO 2 (g) ⇌ N 2 O 4 (g) When the plunger is pushed further into the syringe the pressure increases and the mixture becomes paler in colour. When the syringe is placed in a hot oven the mixture becomes darker in colour. Which of the following statements is correct?

NO 2 is brown and the forward reaction is exothermic.

NO 2 is brown and the forward reaction is endothermic.

NO 2 is colourless and the forward reaction is exothermic.

NO 2 is colourless and the forward reaction is endothermic.

The standard enthalpy of formation, Δ H f for O 3 (g) is + 142 kJ mol –1 . In which one of the following would both the changes shown increase the amount of O 2 gas in an equilibrium mixture containing only O 2 (g) and O 3 (g)?

decreasing the temperature and decreasing the pressure

increasing the temperature and increasing the pressure

increasing the temperature and decreasing the pressure

decreasing the temperature and increasing the pressure

Refer to the following reaction H 2 (g) + I 2 (g) ⇌ 2HI(g) Δ H = −11 kJ mol −1 , Δ S = +20 J K −1 mol −1 Which one of the following statements is correct?

The reaction is not feasible below 298 K

At equilibrium, the yield of hydrogen iodide is changed by increasing the pressure.

At equilibrium, the yield of hydrogen iodide increases as the temperature is increased.

The ester methyl ethanoate is hydrolysed as shown in the following equation. The equilibrium yield of ethanoic acid could be increased by

adding more water to the reaction mixture.

adding more methanol to the reaction mixture.

The graph shows the equilibrium percentage of ammonia present during the formation of ammonia by the Haber process: N 2 + 3H 2 ⇌ 2NH 3 ∆ H = −92 kJ mol −1 Which one of the following are correct labels for the graph?

x axis: pressure Curve A: low temperature Curve B: high temperature

x axis: temperature Curve A: high pressure Curve B: low pressure

x axis: temperature Curve A: low pressure Curve B: high pressure

x axis: pressure Curve A: high temperature Curve B: low temperature

A compound X is formed during a gas phase reaction. The graphs below show how the percentage of a compound X present at equilibrium varies with temperature and pressure. Which one of the following statements concerning the formation of X is correct?

The reaction is exothermic and involves a decrease in the number of moles of gas.

The reaction is exothermic and involves no change in the number of moles of gas.

The reaction is exothermic and involves an increase in the number of moles of gas.

The reaction is endothermic and involves a decrease in the number of moles of gas.

A sample of chlorine gas was sealed in a tube, heated and an equilibrium was established. Cl 2 (g) ⇌ 2Cl(g) Which one of the following is not true?

Increase in pressure causes an increase in the concentration of chlorine atoms relative to chlorine molecules.

The concentration of chlorine atoms remains the same when a catalyst is added to the tube.

Increase in temperature causes an increase in the concentration of chlorine atoms.

Addition of more chlorine gas to the tube causes an increase in the concentration of chlorine atoms.

Le Chatelier

Authored by Wendy Winnard

Chemistry

12th Grade

NGSS covered

Used 201+ times

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20 questions

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MULTIPLE CHOICE QUESTION

2 mins • 1 pt

The following factors affect the position of equilibrium EXCEPT

Concentration

Pressure

Temperature

States of matter

Tags

NGSS.HS-PS1-6

NGSS.HS-PS1-5

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

2SO₂(g)+O₂(g) ⇌ 2SO₃(g) exothermic

Increasing the temperature will...

shift equilibrium right

shift equilibrium left

reduce pressure

have no change

Tags

NGSS.HS-PS1-6

NGSS.HS-PS1-5

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

2SO_2(g) + O_2(g) ⇌ 2SO_3(g)+ exothermic

Removing O_2(g) will

shift equilibrium right

shift equilibrium left

increase pressure

have no change

Tags

NGSS.HS-PS1-6

NGSS.HS-PS1-5

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

2SO₂(g)+O₂(g) ⇌ 2SO₃(g) + Exothermic

Adding SO₃(g) will

shift equilibrium right

shift equilibrium left

increase K

have no change

Tags

NGSS.HS-PS1-6

NGSS.HS-PS1-5

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

2SO₂(g)+1O₂(g) ⇌ 2SO₃(g) exothermic

Increasing the volume of the container will...

shift equilibrium right

shift equilibrium left

slow rate of reaction

have no change

Tags

NGSS.HS-PS1-6

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

2SO₂(g) + O₂(g) ⇌ 2SO₃(g) exothemic

Using a catalyst

shift equilibrium right

shift equilibrium left

increase the rate of reaction

have no change

Tags

NGSS.HS-PS1-6

NGSS.HS-PS1-5

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Which statement is not correct about the industrial preparation of ethanol by the hydration of ethene at 300 °C?

C₂H₄(g) + H₂O(g) ⇌ C₂H₅OH(g) ∆H = –46 kJ mol^–1

The reaction is catalysed by an acid.

The higher the pressure, the higher the equilibrium yield of ethanol.

The higher the temperature, the higher the equilibrium yield of ethanol.

A low equilibrium yield of ethanol is acceptable because unreacted ethene is recycled.

Tags

NGSS.HS-PS1-6

NGSS.HS-PS1-5

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Le Chatelier

The following factors affect the position of equilibrium EXCEPT

2SO₂(g)+O₂(g) ⇌ 2SO₃(g) exothermic

Increasing the temperature will...

2SO_2(g) + O_2(g) ⇌ 2SO_3(g)+ exothermic

Removing O_2(g) will

2SO₂(g)+O₂(g) ⇌ 2SO₃(g) + Exothermic

Adding SO₃(g) will

2SO₂(g)+1O₂(g) ⇌ 2SO₃(g) exothermic

Increasing the volume of the container will...

2SO₂(g) + O₂(g) ⇌ 2SO₃(g) exothemic

Using a catalyst

Which statement is not correct about the industrial preparation of ethanol by the hydration of ethene at 300 °C?

C₂H₄(g) + H₂O(g) ⇌ C₂H₅OH(g) ∆H = –46 kJ mol^–1

For this reaction at equilibrium, which combination of temperature and pressure would give the greatest equilibrium yield of products?

W(g) + X(g) ⇌ 2Y(g) + Z(g) ∆H = +47 kJ mol^–1

The forward reaction in this equilibrium is endothermic

COCl₂ (g) ⇌ CO(g) + Cl₂ (g)

Which statement is correct?

The following equilibrium was established in a container with volume V cm³ at 393 K and 200 kPa.

M₂(g) + R(g) ⇌ RM₂(g) ΔH = +150 kJ mol⁻¹

Which change would increase the yield of RM₂?

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Le Chatelier

The following factors affect the position of equilibrium EXCEPT

2SO2(g)+O2(g) ⇌ 2SO3(g) exothermicIncreasing the temperature will...

2SO2(g) + O2(g) ⇌ 2SO3(g) + exothermicRemoving O2(g) will

2SO2(g)+O2(g) ⇌ 2SO3(g) + ExothermicAdding SO3(g) will

2SO2(g)+1O2(g) ⇌ 2SO3(g) exothermicIncreasing the volume of the container will...

2SO2(g) + O2(g) ⇌ 2SO3(g) exothemicUsing a catalyst

Which statement is not correct about the industrial preparation of ethanol by the hydration of ethene at 300 °C?C2H4(g) + H2O(g) ⇌ C2H5OH(g) ∆H = –46 kJ mol–1

For this reaction at equilibrium, which combination of temperature and pressure would give the greatest equilibrium yield of products?W(g) + X(g) ⇌ 2Y(g) + Z(g) ∆H = +47 kJ mol–1

The forward reaction in this equilibrium is endothermicCOCl2 (g) ⇌ CO(g) + Cl2 (g)Which statement is correct?

The following equilibrium was established in a container with volume V cm3 at 393 K and 200 kPa.M2(g) + R(g) ⇌ RM2(g) ΔH = +150 kJ mol−1﻿Which change would increase the yield of RM2?

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2SO₂(g)+O₂(g) ⇌ 2SO₃(g) exothermic

Increasing the temperature will...

2SO_2(g) + O_2(g) ⇌ 2SO_3(g)+ exothermic

Removing O_2(g) will

2SO₂(g)+O₂(g) ⇌ 2SO₃(g) + Exothermic

Adding SO₃(g) will

2SO₂(g)+1O₂(g) ⇌ 2SO₃(g) exothermic

Increasing the volume of the container will...

2SO₂(g) + O₂(g) ⇌ 2SO₃(g) exothemic

Using a catalyst

Which statement is not correct about the industrial preparation of ethanol by the hydration of ethene at 300 °C?

C₂H₄(g) + H₂O(g) ⇌ C₂H₅OH(g) ∆H = –46 kJ mol^–1

For this reaction at equilibrium, which combination of temperature and pressure would give the greatest equilibrium yield of products?

W(g) + X(g) ⇌ 2Y(g) + Z(g) ∆H = +47 kJ mol^–1

The forward reaction in this equilibrium is endothermic

COCl₂ (g) ⇌ CO(g) + Cl₂ (g)

Which statement is correct?

The following equilibrium was established in a container with volume V cm³ at 393 K and 200 kPa.

M₂(g) + R(g) ⇌ RM₂(g) ΔH = +150 kJ mol⁻¹

Which change would increase the yield of RM₂?