Chemical Formulae Flashcards

All 6 cards in this deck

What are the formulae of the diatomic elements hydrogen, oxygen, nitrogen and chlorine?

$H_2$, $O_2$, $N_2$ and $Cl_2$ — they exist as molecules of two atoms.

What is the formula of methane?

$CH_4$ — one carbon atom joined to four hydrogen atoms.

What is the formula, including the charge, of the sulfate ion?

$SO_4^{2-}$

What is the formula, including the charge, of the hydroxide ion?

$\mathrm{OH^-}$

Write the formula of the carbonate ion, showing its charge.

$\mathrm{CO_3^{2-}}$: one carbon atom and three oxygen atoms with an overall 2− charge.

Salts called nitrates all contain the same negative ion. What is its formula?

$\mathrm{NO_3^-}$, the nitrate ion (charge 1−).