1. Chemical Formulas and Equations Vocab – Part 1

2. Element pure substances = 1 type of atom (all the same) Examples: H H 2

3. Molecule Anytime 2 or more atoms join (bond) together The atoms can be the same or different

4. Compound A substance made of two or more different atoms BrainPop - Compounds

5. Chemical Formulas An expression that uses chemical symbols to show the number and type of atoms present in a molecule of a substance.

6. Coefficient The number of each molecule in a chemical formula. The Big Number 2H 2 O = H 2 O + H 2 O

7. Subscript The number of atoms of an element in a molecule. The small number