Question

What is a combination of chemical symbols and numbers to represent a substance?

Answer 1

`"....A chemical formula......."`

Explanation:

A chemical formula is a shorthand that represents the proportion or number of chemical elements in a compound or molecule. For the molecule `"butane"`, we could represent this as `C_4H_10`, or we could give a bit more information on the formula:

`H_3C-CH_2-CH_2-CH_3`, which shows the connectivity of the molecule.