Vocabulary #3

1.Compound: A chemical combination of two or more elements.

2.Chemicl bond: A link that atoms or electrically charged particles can form with each other.

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

4.Ion: An elecrically charged particle with unequal numbers of protons and electrons.

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

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

7.Exothermic: A reaction that gives off heat.

8.Endothermic: A reaction that absorbs heat.