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 elecrocally charged particle with unequal numbers of protons and electrons.


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


Chemical Property: A way of describing how a substance changes chemically with other substance.


Exothermic: A reaction that gives off heat.


Endothermic: A reaction that absorbs heat.