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Conservation of Mass
Matter is not created or destroyed during a chemical reaction.
Hypothesis
A tentative explanation for an observation, phenomenon, or scientific problem that can be tested by further investigation.
Independent Variable
The one factor a scientist changes in an experiment.
Atomic Number
The number of protons in the nucleus of an atom.
Atomic Weight
The average mass of all the isotopes of an element.
Mole
The number of atoms of substance equal to the number of atoms in 12g or carbon 12: 6.022 x 10 to the twenty-third power atoms.
Bias
Influence in favor of or against something, usually in a way considered to be unfair.
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