Reversible Reactions Flashcards

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What is a reversible reaction?

A reaction where the products can react to make the original reactants.

Which symbol shows a reversible reaction in a chemical equation?

The double arrow: ⇌.

What do we call the two directions of a reversible reaction?

The forward reaction and the backward reaction.

If the forward reaction is exothermic, what is the backward reaction?

Endothermic.

How do the energy changes in the two directions compare?

They are equal in amount but opposite. One gives out energy; the other takes it in.

What happens when hydrated copper(II) sulfate is heated?

It loses water and turns from blue to white. This makes anhydrous copper(II) sulfate.

How can you reverse the change in copper(II) sulfate after heating?

Add water. It turns blue again to make hydrated copper(II) sulfate.

What happens when solid ammonium chloride is heated, and then cooled?

It splits into ammonia and hydrogen chloride gases. On cooling, they form solid ammonium chloride again.

Can changing temperature change which way a reversible reaction goes?

Yes. Heating drives the endothermic direction. Cooling makes the exothermic direction happen more.

What does hydrated mean for a salt like copper(II) sulfate?

It contains water as part of the solid.

Revision Notes
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