Chemical Reactions

Front

Physical Change Noun

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[fiz-i-kuhl cheynj]

Back

Physical Change

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A change that alters the form or appearance of a substance without changing its fundamental chemical composition.

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Example: Ice melting into water shows a physical change, as the form changes but the mass stays the same.

Front

Chemical Change Noun

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[kem-i-kuhl cheynj]

Back

Chemical Change

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A change in matter that produces one or more new substances with different properties; also called a chemical reaction.

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Example: Reactants (CH4 and O2) change into new products (CO2 and H2O) during a chemical reaction.

Front

Reactant Noun

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[ree-ak-tuhnt]

Back

Reactant

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A substance present at the start of a chemical reaction that undergoes a change to form a new substance.

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Example: Methane (CH4) and oxygen (O2) are reactants that change into carbon dioxide (CO2) and water (H2O) in a reaction.

Front

Product Noun

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[prod-uhkt]

Back

Product

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A new substance that is formed as the result of a chemical reaction between reactants.

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Example: Methane and oxygen react to form carbon dioxide and water, showing the products of the reaction.

Front

Flammability Noun

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[flam-uh-bil-i-tee]

Back

Flammability

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The chemical property describing a substance's ability to burn or ignite, causing fire when exposed to heat or flame.

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Example: The image shows how fuel, oxygen, and heat combine to cause combustion, demonstrating flammability.

Front

Precipitate Noun

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[pri-sip-i-teyt]

Back

Precipitate

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An insoluble solid that emerges from a liquid solution as a result of a chemical reaction.

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Example: A white solid forms in a beaker when two clear solutions are mixed, showing a precipitate.

Front

Chemical Formula Noun

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[kem-i-kuhl fawr-myoo-luh]

Back

Chemical Formula

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A combination of chemical symbols and numbers that represents the elements and their proportions in a single compound.

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Example: The image shows water's chemical formula, H2O, with clear labels for hydrogen and oxygen.

Front

Coefficient Noun

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[koh-uh-fish-uhnt]

Back

Coefficient

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A number placed before a chemical formula in an equation, indicating the number of molecules or moles involved.

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Example: In the equation 5x + 7 = 12, the number 5 is the coefficient because it is the number being multiplied by the variable x.

Front

Law of Conservation of Mass Noun

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[law ov kon-ser-vey-shuhn ov mas]

Back

Law of Conservation of Mass

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The scientific principle stating that matter cannot be created or destroyed in any chemical or physical change.

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Example: A chemical reaction in a closed system shows mass is the same before and after, illustrating the Law of Conservation of Mass.

Front

Open System Noun

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[oh-pen sis-tuhm]

Back

Open System

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A system that can freely exchange both energy and matter with its surroundings.

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Example: Arrows show energy and matter moving between two areas, demonstrating an open system.

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