How are the electrons transferred in hydrogen fuel cell? 

Important Questions on Energy Changes, and Reversible Reactions

MEDIUM

Upper Secondary: IGCSE

IMPORTANT

Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 9 - Energy Changes, and Reversible Reactions>Q>Q 5

What type of electrolyte is used in the hydrogen fuel cell?

MEDIUM

Upper Secondary: IGCSE

IMPORTANT

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

What is a reversible reaction?

MEDIUM

Upper Secondary: IGCSE

IMPORTANT

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

Write a word equation for the reaction between solid copper (II) sulphate and water. 

HARD

Upper Secondary: IGCSE

IMPORTANT

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

How would you turn hydrated copper (II) sulphate into anhydrous copper (II) sulphate?

MEDIUM

Upper Secondary: IGCSE

IMPORTANT

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

What will you observe if you place pink cobalt chloride paper in a warm oven?

MEDIUM

Upper Secondary: IGCSE

IMPORTANT

Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 9 - Energy Changes, and Reversible Reactions>Q>Q 5

Explain the term dynamic equilibrium. 

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.