Ch 6 The Chemistry of Life 6.1

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Acid
Any substance that forms hydrogen ions (H+) in water and has a pH below 7
Atom
Smallest particle of an element that has the characteristics of that element; basic building block of all matter
Base
Any substance that forms hydroxide ions OH- in water and has a pH above 7
Compound
Substance composed of atoms of two or more different elements that are chemically combined.
Covalent bond
Chemical bond formed when two atoms share electrons.