Atoms, Elements, Compounds, Molecules & Changes

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What is an element?

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An element is a pure substance that cannot be broken down into simpler substances by chemical means. It consists of only one type of atom.

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What is a compound?

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A compound is a substance formed when two or more different elements chemically bond together in fixed proportions.

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What is a molecule?

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A molecule is the smallest unit of a chemical compound that retains its chemical properties, consisting of two or more atoms bonded together.

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What are atoms?

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Atoms are the basic building blocks of matter, consisting of protons, neutrons, and electrons.

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What is a chemical property?

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A chemical property is a characteristic of a substance that can only be observed during a chemical reaction, such as flammability or reactivity.

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What is a physical property?

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A physical property is a characteristic of a substance that can be observed or measured without changing its chemical identity, such as color, melting point, or density.

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What is the difference between metals and nonmetals?

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Metals are typically shiny, ductile, and good conductors of heat and electricity, while nonmetals are usually dull, brittle, and poor conductors.

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What is ductility?

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Ductility is the ability of a material to be drawn into wires without breaking.

Front

What is the chemical formula for water?

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The chemical formula for water is H₂O, indicating it is made of two hydrogen atoms and one oxygen atom.

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What is the significance of the periodic table?

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The periodic table organizes all known elements based on their atomic number, electron configuration, and recurring chemical properties.