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Edexcel A-Level Chemistry A2 13.7 The Effect of Temperature on the Position of Equilibrium Is Explained Using a Change in the Value of the Equilibrium Questions

For the sole direct task, state that raising temperature lowers K for sulfur trioxide formation, shifts equilibrium left and decreases the SO₃ yield.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
A2

Exam points

  • Link higher temperature to lower K and lower SO₃ equilibrium yield for the stated reaction.

Edexcel A-Level Chemistry A2 13.7 The Effect of Temperature on the Position of Equilibrium Is Explained Using a Change in the Value of the Equilibrium Questions question 1

[Maximum number: 1]

At 25∘C25^{\circ} \mathrm{C}, the pH of pure water is 7.0 and at 75∘C75^{\circ} \mathrm{C} the pH is 6.4 .
Why is the pH of pure water lower at 75∘C75^{\circ} \mathrm{C} than at 25∘C25^{\circ} \mathrm{C} ?

A

there are more hydrogen ions than hydroxide ions when the water is at 75∘C75^{\circ} \mathrm{C}

B

the dissociation of water is endothermic so the concentration of hydrogen ions is lower at 75∘C75^{\circ} \mathrm{C}

C

the dissociation of water is endothermic so the concentration of hydrogen ions is higher at 75∘C75^{\circ} \mathrm{C}

D

the dissociation of water is exothermic so the concentration of hydrogen ions is higher at 75∘C75^{\circ} \mathrm{C}

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