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What Is Chemistry?Everything you can touch, taste, or breathe is built from tiny invisible pieces called atoms — and chemistry is the story of how those pieces rearrange to make the whole world.

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Inside the AtomEvery atom is a tiny solar system: a dense nucleus of protons and neutrons at the center, with electrons whizzing around it — and the proton count is what makes an atom what it is.

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Elements & the Periodic TableThe periodic table isn't a random grid — it's every element lined up by proton count, arranged so that elements in the same column behave in the same way. It's chemistry's master map.

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IsotopesAtoms of the same element can carry different numbers of neutrons — making them heavier or lighter twins called isotopes. They're still the same element, but their extra weight unlocks medicine, energy, and time travel into the past.

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IonsWhen an atom gains or loses electrons, its perfect balance of charge breaks — and it becomes an ion, carrying a positive or negative charge. These charged atoms run your batteries, your nerves, and the salt on your fries.

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Electron ShellsElectrons don't swarm an atom randomly — they fill neat layers called shells, holding 2, then 8, then 8. The electrons in the outermost shell, called valence electrons, decide nearly everything about how an atom reacts.

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Periodic TrendsThe periodic table's columns are families with shared personalities. Noble gases are aloof and unreactive; alkali metals are wildly eager to react. Once you know the column, you can predict the behavior.

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States of MatterSolid, liquid, gas — the same atoms can take all three forms. The secret is temperature: heat makes particles move faster, and at the right temperatures matter melts and boils, switching from one state to the next.

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Chemical Bonds

Ionic Bonds

Covalent Bonds

Molecules & Formulas

Naming Compounds

Molar Mass

The Mole

Grams ↔ Moles

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Chemical Reactions

Balancing Equations

Types of Reactions

Stoichiometry

The Limiting Reactant

Percent Yield

Concentration & Molarity

Gas Laws

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Thermochemistry

Reaction Rates

Chemical Equilibrium

Acids & Bases

Titration

Redox Reactions

Electrochemistry

Capstone: Chemistry Everywhere