Characteristics of Chemical Reactions

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Chemical Reaction Noun

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

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Chemical Reaction

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A process where substances interact and are chemically changed, producing new substances with different properties.

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Example: Reactants CH4 and O2 transform into products CO2 and H2O, showing a chemical reaction.

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Reactants Noun

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[ree-ak-tuhnts]

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Reactants

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The initial substances that are combined and interact at the beginning of a chemical reaction.

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Example: Reactants like CH4 and O2 combine to form products CO2 and H2O in a chemical reaction.

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Products Noun

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[prod-ukts]

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Products

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The new substances that are formed as the result of a chemical reaction's atomic rearrangement.

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Example: The image shows hydrogen and oxygen reacting to form water, illustrating products of a chemical reaction.

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Atom Noun

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[at-uhm]

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Atom

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The fundamental unit of a chemical element whose arrangement is changed during a chemical reaction.

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Example: The image shows an atom with labeled protons, neutrons, and electrons, illustrating its basic structure.

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Molecule Noun

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[mol-i-kyool]

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Molecule

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A group of two or more atoms bonded together, representing the smallest unit of a chemical compound.

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Example: The image shows a water molecule with two hydrogen atoms and one oxygen atom bonded together.

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Chemical Equation Noun

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[kem-i-kuhl i-kwey-zhuhn]

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Chemical Equation

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A symbolic representation using formulas to show the reactants and products involved in a chemical reaction.

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Example: The image shows how hydrogen and oxygen molecules react to form water, illustrating a chemical equation.

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Combustion Noun

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[kuhm-buhs-chuhn]

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Combustion

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A rapid chemical reaction with an oxidant, usually oxygen, that produces energy as heat and light.

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Example: Combustion of hydrocarbons with oxygen produces carbon dioxide, water, and energy as heat and light.

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Endothermic Reaction Noun

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[en-doh-thur-mik ree-ak-shuhn]

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Endothermic Reaction

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A chemical reaction that absorbs heat energy from its surroundings, causing the temperature to decrease.

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Example: Heat moves from the surroundings into the reaction, shown by arrows pointing inward.

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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 substance that forms and separates from a liquid solution during a chemical reaction.

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Example: Mixing two solutions forms a solid precipitate, shown as colored spheres settling at the bottom.

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Insoluble Adjective

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[in-sol-yuh-buhl]

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Insoluble

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Describes a substance that is unable to dissolve in a given solvent, often forming a precipitate.

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Example: The image shows a substance that does not dissolve in water, illustrating insolubility.