12. Practice: A rectangular boat has a width of 5 cm, a length of 8 cm, and a mass of 150 g.
How far will the boat sink into liquid with a density of 1.2 g/mL? Check your answer.

Atoms are the smallest unit of matter that can't be broken down chemically. Molecules are groups of two or more atoms that are chemically bonded. Ions are atoms or molecules that have gained or lost one or more of their valence electrons and therefore have a net positive or negative charge.