Chemical changes:
burning wood
digesting food
mixing acid and base
Physical changes:
breaking a bottle
melting an ice cube
crumbling a sheet of paper
Subtract the number of electrons from the protons. neutrons have no charge so those don't matter in the formula
Center of the solar system
"The vapor pressure<span> of water is relatively </span>low<span> because it is held together through hydrogen bonds. This means that the molecules in a glass of water do not evaporate from the water very easily, as the molecules are attracted to each other."</span>
