Formaldehyde is a substance made up of three different types of atoms that are chemically combined in a fixed ratio. As which type of matter is formaldehyde correctly classified?

Ineed this awnser fast select the correct answer. this chemical equation represents the burning of methane, but the equation is incomplete. what is the missing coefficient in both the reactants and the products? ch4 + → co2 + a. 0 b. 1c. 2d. 3 e. 4