Back and Fourth Arrows

[Danieljm1B]

When are doubled headed arrows used in chemical formulas, or in other words, arrows pointing in both directions? Is it when a reaction is reversible? In that case when is it acceptable to use these arrows against using arrows just pointing one way?

[Kevin To 1B]

Such arrows are to represent a certain chemical equation that can go forward or reverse. Generally, these arrows appear in chemical equations that deal with equilibrium, including acid-base equilibria. The direction of the reaction would depend on the quantity of reactants vs products, as determined by Le Châtelier’s Principle.

[Haorui Li 1A]

Two-way double half arrows represent a reaction that can go either forward or reverse. Whether the reaction shifts or not depends on Le Chatlier's principle. In the lecture, strong acids used double arrows but weak acids used single arrows.

[Yen Ho Chou 1D]

When there are two arrows, the reaction is reversible

[Grecia Velasco 1G]

When are doubled headed arrows used in chemical formulas, or in other words, arrows pointing in both directions? Is it when a reaction is reversible? In that case when is it acceptable to use these arrows against using arrows just pointing one way?

Two arrows means reaction is reversible.

[Alex Hitti 3E]

Double headed arrows is the symbol that implies that the reaction is reversible. If an arrow is pointing only one way then that implies that the reaction is nonreversible.

[KaleenaJezycki_1I]

When are doubled headed arrows used in chemical formulas, or in other words, arrows pointing in both directions? Is it when a reaction is reversible? In that case when is it acceptable to use these arrows against using arrows just pointing one way?

Yes, that is correct. If the arrows point both ways then the reaction is reversible. This will not be something to stress right now, it will probably be mentioned when we begin to talk about acids and bases and equilibrium.