Science Vocabulary – TEKS 8.6B & 8.6E

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Atom

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The smallest unit of matter that retains the properties of an element. Example: Hydrogen atom (H)

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Element

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A pure substance made of only one kind of atom, listed on the periodic table. Example: Oxygen (O)

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Compound

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A substance formed when two or more elements chemically bond. Example: Water (H₂O)

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Chemical Formula

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A shorthand way to show the elements and number of atoms in a compound. Example: H₂O has 2 H atoms, 1 O atom

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Subscript

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The small number written below and to the right of a chemical symbol that shows how many atoms are present. Example: In H₂O, the ₂ means 2 hydrogen atoms

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Coefficient

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The big number written in front of a chemical formula that shows how many molecules are present. Example: 2H₂O means 2 water molecules

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Periodic Table

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A chart of all known elements organized by their properties. Example: Na (sodium) is in group 1

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Chemical Reaction

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A process in which substances (reactants) change into new substances (products). Example: Vinegar + baking soda → CO₂

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Reactants

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The starting substances in a chemical reaction. Example: Hydrogen (H₂) + Oxygen (O₂) -> Water (H₂O)

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Products

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The new substances formed in a chemical reaction. Example: Hydrogen (H₂) + Oxygen (O₂) -> Water (H₂O)