|Ice ____ because its density is less than liquid water.
|Salt, sand, diamonds, and snowflakes are ____ solids.
|Salts and sugars dissolve in water and thus are water ____.
|Blood, muddy water, soil, and granite are ____ mixtures.
|All atoms of an element have the ____ number of protons.
|Water freezes at 32° and boils at 212° ____.
|Positive and negative charges ____ each other.
|Unlike chemical changes, physical changes can be ____.