Chemistry Blog
Clear, practical guides to the ideas behind the definitions.
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The Mole and Avogadro's Number, Explained A mole is 6.022 x 10^23 particles, the number chemists use to count atoms and molecules. Learn what a mole is, why it matters, and how to use it in problems.
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What's the Difference Between an Atom and a Molecule? An atom is the smallest unit of an element; a molecule is two or more atoms bonded together. Here is a clear, example-rich guide to how they differ and relate.
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The Main Branches of Chemistry (and What Each One Studies) Chemistry has five main branches: organic, inorganic, physical, analytical, and biochemistry. Here is what each one studies, the tools it uses, and where it shows up in daily life.
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Acids and Bases in Chemistry A deeper guide to acids and bases: the Arrhenius, Brønsted–Lowry, and Lewis theories, pH and pKa, strong vs weak, neutralization, salts, and buffers.