Elements and Compounds Flashcard

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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 types of atoms bond together chemically.

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There are 3 different elements: Carbon (C), Hydrogen (H), and Oxygen (O).

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There are 2 elements: Sodium (Na) and Chlorine (Cl).

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What is the difference between an element and a compound?

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An element consists of only one type of atom, while a compound consists of two or more different types of atoms chemically bonded together.

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What is a chemical formula?

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A chemical formula is a way of expressing the composition of a substance using symbols for its constituent elements.

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What does the subscript in a chemical formula indicate?

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The subscript indicates the number of atoms of the element present in the molecule.

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What is the significance of the number in front of a chemical formula in a reaction?

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The number indicates the number of molecules or moles of that substance involved in the reaction.