Explain the term dynamic equilibrium. 

Important Questions on Energy Changes, and Reversible Reactions

HARD

Upper Secondary: IGCSE

IMPORTANT

Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 9 - Energy Changes, and Reversible Reactions>Q>Q 6

Nitrogen and hydrogen mixed, to make ammonia. Soon, two reactions are going on in the mixture. Give the equations for them. 

HARD

Upper Secondary: IGCSE

IMPORTANT

Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 9 - Energy Changes, and Reversible Reactions>Q>Q 6

Nitrogen and hydrogen mixed, to make ammonia. For a time, the rate of the forward reaction is greater than the rate of the back reaction. Has equilibrium been reached? Explain.

EASY

Upper Secondary: IGCSE

IMPORTANT

Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 9 - Energy Changes, and Reversible Reactions>Q>Q 1

The reaction between nitrogen and hydrogen is reversible. This causes a problem for the ammonia factory. Why?

EASY

Upper Secondary: IGCSE

IMPORTANT

Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 9 - Energy Changes, and Reversible Reactions>Q>Q 2

What is Le Chatelier‘s principle? Write it down.

EASY

Upper Secondary: IGCSE

IMPORTANT

Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 9 - Energy Changes, and Reversible Reactions>Q>Q 3

In manufacturing ammonia, explain why: high pressure is used.

EASY

Upper Secondary: IGCSE

IMPORTANT

Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 9 - Energy Changes, and Reversible Reactions>Q>Q 3

In manufacturing ammonia, explain why: ammonia is removed.

EASY

Upper Secondary: IGCSE

IMPORTANT

Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 9 - Energy Changes, and Reversible Reactions>Q>Q 4

Sulphur dioxide (${\mathrm{SO}}_2$) and oxygen react exothermically to form sulphur trioxide (${\mathrm{SO}}_3$). The reaction is reversible. Write the symbol equation for this reaction.

EASY

Upper Secondary: IGCSE

IMPORTANT

Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 9 - Energy Changes, and Reversible Reactions>Q>Q 4

Sulphur dioxide $\left({\mathrm{SO}}_2\right)$ and oxygen react exothermically to form sulphur trioxide $\left({\mathrm{SO}}_3\right)$. The reaction is reversible. What happens to the yield of sulphur trioxide if you: increase the pressure?