Question

quiz : balancing chemical reactions

ch₄(g) + 2o₂(g) → co₂(g) + 2h₂o(l)

in this reaction, oxygen is a _______

solid

pricipitate

gas

liquid

Explanation:

In chemical equations, the state of a substance is indicated by the symbol in parentheses. For oxygen (\(O_2\)) in the given reaction \(CH_4(g)+2O_2(g)\to CO_2(g)+2H_2O(l)\), the symbol \((g)\) stands for gas. A solid would be \((s)\), a precipitate is formed in a double - displacement reaction (not relevant here as no such context), and liquid is \((l)\) (used for \(H_2O\) in this equation).

Answer:

gas (the option with the correct state for oxygen as indicated by \((g)\) in the chemical equation)