Property Changes in Chemical Reactions

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Chemical Change Noun

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[kem-i-kuhl cheynj]

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Chemical Change

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A process where matter transforms into new substances with different chemical and physical properties, changing its fundamental identity.

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Example: Hydrogen and oxygen gases react to form water, showing a chemical change.

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Physical Change Noun

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[fiz-i-kuhl cheynj]

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Physical Change

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A change affecting a substance's form or appearance, such as state or shape, without altering its chemical composition.

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Example: The image shows how a substance can change from solid to liquid to gas, illustrating a physical change.

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Physical Weathering Noun

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[fiz-i-kuhl weth-er-ing]

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Physical Weathering

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The mechanical process of breaking down rocks into smaller pieces without altering their chemical makeup or mineral composition.

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Example: A river eroding the land shows physical weathering by breaking rocks into smaller pieces.

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Chemical Weathering Noun

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[kem-i-kuhl weth-er-ing]

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Chemical Weathering

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The decomposition of rocks and minerals through chemical reactions, primarily with water and substances in the atmosphere.

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Example: Hydrochloric acid reacts with iron, showing chemical weathering as gas bubbles form.

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Precipitate Noun

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[pri-sip-i-teyt]

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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: The image shows a solution turning into a precipitate, illustrating the formation of an insoluble solid from a liquid.

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Chemical Reaction Noun

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[kem-i-kuhl ree-ak-shun]

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Chemical Reaction

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A process involving the rearrangement of the molecular or ionic structure of a substance to form new substances.

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Example: The image shows how hydrogen and oxygen molecules rearrange to form water in a chemical reaction.

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Reactant Noun

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[ree-ak-tuhnt]

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Reactant

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A substance that takes part in and undergoes change during a chemical reaction, written on an equation's left side.

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Example: The image shows reactants (H2 and O2) combining to form water (H2O), illustrating reactants in a chemical reaction.

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Product Noun

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[prod-uhkt]

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Product

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A new substance formed as the result of a chemical reaction, written on an equation's right side.

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Example: The image shows a chemical equation where hydrogen and oxygen react to form water, the product.

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Chemical Bond Noun

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[kem-i-kuhl bond]

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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 hydrogen and oxygen atoms forming a water molecule through chemical bonds.

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Law of Conservation of Mass Noun

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[law uv kon-ser-vey-shun uv mas]

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Law of Conservation of Mass

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The principle that matter cannot be created or destroyed in an isolated system during a chemical reaction.

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Example: The image shows reactants and products in a chemical reaction, illustrating mass conservation.