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A double arrow shows that the reaction is reversible, it represents an equilibrium in which the products on the right can react together and produce the left hand side. A chemical equation without a double arrow isn't reversible and can only go in one direction.

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15y ago
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13y ago

A double arrow indicates a reversable or an equilibrium reaction.

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12y ago

It means that the reaction is reversible, such as that in the production of ammonia in the haber process

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11y ago

An equation with a one-way arrow indicates the the reaction occurs in one direction. An equation with an arrow pointing in both directions indicates that the reaction is reversible.

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Q: Why do some chemical equations use double arrows while some do not?
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