Elements, Compounds, Chemical Formulas and Equations

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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. Examples include Iron (Fe), Oxygen (O), and Gold (Au).

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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. Examples include water (H2O) and carbon dioxide (CO2).

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What does a chemical formula represent?

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A chemical formula represents the elements in a compound and the number of atoms of each element. For example, H2O indicates 2 hydrogen atoms and 1 oxygen atom.

Front

How many total atoms are in the compound H2C3O4N5?

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14 total atoms.

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How many hydrogen atoms are in acetic acid (C2H4O2)?

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4 hydrogen atoms.

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How many hydrogen atoms are in 4H2O?

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8 hydrogen atoms.

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True or False: A compound consists of two or more elements bound together.

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True.

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What is the difference between an element and a compound?

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An element is a single type of atom, while a compound is made up of two or more different types of atoms chemically bonded together.

Front

What is the chemical formula for water?

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H2O.

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What is the chemical formula for carbon dioxide?

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CO2.