Modeling Conservation of Mass

Front

Law of Conservation of Mass Noun

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[law uv kon-sur-vay-shun uv mas]

Back

Law of Conservation of Mass

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The principle that matter is not created or destroyed in a chemical reaction, so reactant mass equals product mass.

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Example: The image shows that the number of atoms in reactants equals the number in products, demonstrating mass conservation.

Front

Mass Noun

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[mas]

Back

Mass

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A measure of the amount of matter that is present in a substance or an object.

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Example: A balance scale with a feather and a rock shows that mass is the amount of matter in an object.

Front

Reactant Noun

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[ree-ak-tunt]

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Reactant

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A substance that participates in and undergoes change during a chemical reaction, found on the left side of an equation.

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Example: The image shows hydrogen and oxygen as reactants forming water in a chemical reaction.

Front

Product Noun

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[prod-ukt]

Back

Product

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A new substance that is formed as the result of a chemical reaction, found on the right side of an equation.

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Example: The image shows how methane and oxygen react to form carbon dioxide and water, illustrating products of a chemical reaction.

Front

Chemical Equation Noun

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[kem-i-kuhl ee-kway-zhun]

Back

Chemical Equation

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A symbolic representation of a chemical reaction using formulas to show the relationship between reactants and products.

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Example: The image shows a chemical equation with molecules of hydrogen and oxygen forming water, illustrating conservation of mass.

Front

Combustion Noun

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[kum-bus-chun]

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Combustion

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A rapid chemical reaction between a substance and an oxidant, usually oxygen, to produce heat and light.

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Example: Combustion of a hydrocarbon with oxygen produces carbon dioxide, water, heat, and light.

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Compound Noun

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[kom-pound]

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Compound

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A substance formed when two or more different chemical elements are chemically bonded together in fixed proportions.

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Example: A CO2 molecule shows how carbon and oxygen atoms bond to form a compound.

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Chemical Bond Noun

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[kem-i-kuhl bond]

Back

Chemical Bond

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A lasting attraction between atoms, ions, or molecules that enables the formation of chemical compounds.

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Example: The image shows a water molecule with bonds between hydrogen and oxygen atoms, illustrating chemical bonds.

Front

Covalent Bond Noun

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[koh-vay-lunt bond]

Back

Covalent Bond

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A type of chemical bond that involves the sharing of electron pairs between atoms to form molecules.

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Example: The image shows how hydrogen and oxygen atoms share electrons to form a water molecule, demonstrating a covalent bond.

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Molecule Noun

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[mol-eh-kyool]

Back

Molecule

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The smallest particle of a substance that retains the chemical and physical properties of that substance.

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Example: This image shows a water molecule, the smallest unit of water, with two hydrogen atoms and one oxygen atom.