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 that alters the form or appearance of a substance without changing it into a different substance.

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Example: Ice melting in a beaker shows a physical change as it turns from solid to liquid without becoming a different substance.

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Matter Noun

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[mat-er]

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Matter

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The substance of which all physical objects are composed, characterized by having mass and occupying space.

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Example: The image shows how matter exists in three states: solid, liquid, and gas, each with different particle arrangements.

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Evaporation Noun

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[ih-vap-uh-rey-shuhn]

Back

Evaporation

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The process where a liquid turns into a gas or vapor without reaching its boiling point.

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Example: Sun heats a puddle, causing water to evaporate into vapor.

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Melting Point Noun

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[mel-ting point]

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Melting Point

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The specific temperature at which a substance changes its state from a solid to a liquid.

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Example: Ice melts into water at 0°C, showing the melting point where solid changes to liquid.

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Boiling Point Noun

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[boi-ling point]

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Boiling Point

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The specific temperature at which a substance changes its state from a liquid to a gas.

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Example: The image shows boiling as vapor pressure equals atmospheric pressure, allowing bubbles to form and rise.

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Density Noun

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[den-si-tee]

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Density

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A characteristic physical property that measures the amount of mass contained in a given volume of a substance.

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Example: Objects with different densities float or sink in water, showing how mass and volume affect density.

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Conductivity Noun

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[kon-duhk-tiv-i-tee]

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Conductivity

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A characteristic physical property describing a substance's ability to allow the flow of heat or electricity.

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Example: Heat flows from a hot object to a cold one, showing thermal conductivity.

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Malleability Noun

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[mal-ee-uh-bil-i-tee]

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Malleability

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A physical property describing the ability to be hammered or pressed into different shapes without breaking.

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Example: A metal ball being pressed into a ring shape shows malleability.

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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 from the original substances.

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Example: Iron reacts with hydrochloric acid to form gas bubbles, showing a chemical change.

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Chemical Reaction Noun

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

Back

Chemical Reaction

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A process that involves the rearrangement of atoms and molecules to form one or more new substances.

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Example: Reactants CH4 and O2 rearrange to form new products CO2 and H2O.