Molecules, Compounds, & Elements

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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 is represented on the periodic table.

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What is a compound?

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A compound is a substance formed when two or more elements are chemically bonded together. For example, water (H2O) is a compound made of hydrogen and oxygen.

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What is a mixture?

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A mixture is a combination of two or more substances that are not chemically bonded. Each substance retains its own properties.

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Where can you find elements?

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Elements can be found on the periodic table, which organizes them based on their atomic number and properties.

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What is the chemical symbol for hydrogen?

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The chemical symbol for hydrogen is H.

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What is the chemical formula for water?

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The chemical formula for water is H2O.

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What is krypton?

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Krypton is a chemical element with the symbol Kr and atomic number 36. It is a noble gas.

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What is sodium chloride?

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Sodium chloride (NaCl) is a compound formed from the elements sodium (Na) and chlorine (Cl). It is commonly known as table salt.

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What distinguishes a compound from a mixture?

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A compound is made of two or more elements chemically bonded together, while a mixture consists of two or more substances that are physically combined.

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What is the chemical formula for carbon dioxide?

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The chemical formula for carbon dioxide is CO2.