Chemical changes

Chemical Changes

Compound: a chemical combination of two or more elements.

Chemical bond: a link that atoms or electrically charged particles can form with each other.

Chemical formula: a way of using letters and numbers to show how much of each element is in a substance.

Ion: an electrically charged particle with unequal numbers of protons and elctrons.

Molecule: a group of bonded atoms that act like a single particle.

Chemical property: a way of describing how a substance changes chemically with other substances.

Exothermic: a reaction that gives off energy.

Endothermic: a reaction that absorbs heat.