Question

You probably already know the names of some molecules. Identify which compound (water, salt, carbon dioxide, or methane) corresponds to each of the following chemical formulas. H2O is . CO2 is . NaCl is . CH4 is .

Answer 1

CO2 is carbon

H2O is water

CH4 is methane

NaCI is salt

Answer 2

Explanation:

Water has a formula which represents two hydrogen atoms are attached to one oxygen atom. Therefore, the formula of water is $H_{2}O$.

Salt is also known as sodium chloride. Its formula represents that one sodium atom is attached to one chlorine atom, therefore, its formula is NaCl.

Carbon dioxide has a formula which represents one carbon atom is attached to two oxygen atoms. Therefore, its formula is $CO_{2}$.

Methane has a formula which represents one carbon atom is attached to four hydrogen atoms. Therefore, its formula is $CH_{4}$.

Thus, we can conclude that $H_{2}O$ is water, $CO_{2}$ is carbon dioxide, NaCl is salt, and $CH_{4}$ is methane.