The models below represent two molecules composed of carbon atoms, hydrogen atoms, and oxygen atoms.

Question

H

C

O
A model of a molecule containing three balls labeled C, six balls labeled H, and one ball labeled O.

A model of a molecule containing three balls labeled C, eight balls labeled H, and one ball labeled O.

Complete the statement.

these molecules make up a the same substance or B different substances

Answer 1

These molecules make up B different substances.

The first molecule has the formula C3H6O, while the second molecule has the formula C3H8O. The difference in the number of hydrogen atoms indicates that they are different compounds, despite having the same number of carbon and oxygen atoms.