Question

a represents both the identities and the relative quantities of substances undergoing a chemical change. coefficient chemical equation stoichiometric ratio chemical formula question 2 1 pts the reaction between methane and oxygen yields. carbon dioxide and water graphite and hydrogen graphene and water carbon monoxide and water

Explanation:

• For the first question: A chemical equation shows which substances react (reactants) and which are formed (products) - their identities. The coefficients in a chemical equation give the relative quantities (molar ratios) of the substances. A coefficient is just a number in front of a chemical formula in an equation. A stoichiometric ratio is a ratio derived from the coefficients in a chemical equation but doesn't represent identities. A chemical formula represents a single substance, not a chemical change with multiple substances.
• For the second question: The balanced chemical equation for the combustion of methane (\(CH_4\)) in oxygen (\(O_2\)) is \(CH_4 + 2O_2

ightarrow CO_2+2H_2O\). So the products are carbon dioxide (\(CO_2\)) and water (\(H_2O\)). Graphite (\(C\)) and hydrogen (\(H_2\)) would imply a decomposition or some other non - combustion reaction. Graphene (\(C\)) is not formed in methane combustion. Carbon monoxide (\(CO\)) would form in incomplete combustion, but the standard complete combustion of methane (as is usually taught in basic chemistry when not specifying incomplete) gives \(CO_2\).

Answer:

1. B. chemical equation
2. A. carbon dioxide and water