Reversible Reactions Flashcards

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Note: We may include questions that have multiple correct answers. It's useful to remember specific examples to understand these concepts better.

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What is a reversible reaction?

A reversible reaction is a reaction that can go both ways, from reactants to products and back again.

What symbol is used in an equation to show that a reaction is reversible, and what does it mean?

We use a double arrow, ⇌. It means the reaction can go in both directions.

How is a reversible reaction different from an irreversible reaction, like burning paper?

In a reversible reaction, the products can change back into the reactants. In an irreversible reaction, the products cannot change back.

In a reversible reaction, what are the forward and reverse reactions?

The forward reaction goes from reactants to products. The reverse reaction goes from products back to reactants.

What happens when solid ammonium chloride is heated, and what happens when it cools again?

When solid ammonium chloride is heated, it breaks down to make ammonia gas and hydrogen chloride gas. When these gases cool, they react together again to form solid ammonium chloride.

In the reversible reaction between anhydrous copper sulfate and water, what colour change do you see when water is added?

White anhydrous copper sulfate turns blue when water is added, because hydrated copper sulfate forms.

In the same copper sulfate reaction, what happens when the blue hydrated copper sulfate is heated strongly?

When blue hydrated copper sulfate is heated strongly, it loses water and turns back to white anhydrous copper sulfate.

If the forward direction of a reversible reaction is exothermic, what is true about the reverse direction?

If the forward reaction is exothermic and gives out energy, the reverse reaction is endothermic and takes in energy.

In a reversible reaction, how do the energy changes of the forward and reverse reactions compare?

The forward and reverse reactions transfer the same amount of energy, but in opposite directions.

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