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An upward arrow after a formula, marking a gas leaving the reaction.
Also known as: Up arrow chemistry, Effervescence arrow
An upward arrow after a formula means that product escapes as a gas. It and the precipitate arrow are the same convention pointing two ways, and both describe leaving the solution rather than the reaction.
Marks a product that leaves the reaction mixture as a gas.
Contexts: Laboratory
Describes leaving the solution rather than leaving the reaction, which is why the substance still appears in the equation.
Contexts: Laboratory
A short vertical arrow pointing upward, set immediately after a chemical formula on the same line.
Gas leaving upward against solid falling down.