|The boiling of an egg is a chemical (not a physical) ____.
|Sugar dissolving and ice melting are ____ changes.
|Salts and sugars dissolve in water and thus are water ____.
|Positive and negative charges ____ each other.
|A solution with a pH less than 7 is ____.
|Iron rusting, milk souring, and wood burning are ____ changes.
|All atoms of an element have the ____ number of protons.
|Water freezes at 32° and boils at 212° ____.