Writing Chemical Formulas

Front

What is the formula for copper (II) hydroxide?

Back

Cu(OH)₂

Front

When adding a subscript to a polyatomic ion, what should you do?

Back

Put parentheses around the polyatomic ion before adding a subscript.

Front

What is the correct formula for dinitrogen tetroxide?

Back

N₂O₄

Front

What is the formula of ammonium ion?

Back

NH₄⁺

Front

What is the formula for ammonium phosphate?

Back

(NH₄)₃PO₄

Front

What does a subscript in a chemical formula indicate?

Back

The number of atoms of the element in the molecule.

Front

What is a polyatomic ion?

Back

An ion composed of two or more atoms bonded together, that acts as a single unit with a net charge.

Front

How do you write the formula for a compound containing a polyatomic ion?

Back

Use the formula of the polyatomic ion and balance the charges with the appropriate subscripts.

Front

What is the significance of parentheses in chemical formulas?

Back

Parentheses are used to indicate that the enclosed polyatomic ion should be treated as a single unit, especially when adding subscripts.

Front

What is the formula for sulfate ion?

Back

SO₄²⁻