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What is an atom?
Basic building block of matter.
What defines an element?
Atoms with the same number of protons.
What is a compound?
Elements chemically bonded together.
What is a molecule?
A molecule is a group of two or more atoms chemically bonded together.
What is a chemical reaction?
Rearrangement of atoms to form new substances.
What are acids?
Produce H+ ions, pH less than 7.
What are bases?
Produce OH- ions, pH greater than 7.
What does the pH scale measure?
Acidity or basicity from 0 to 14.