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a process that involves rearrangement of the molecular or ionic structure of a substance, as opposed to a change in physical form or a nuclear reaction.

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The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.

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a quantity obtained by multiplying quantities together, or from an analogous algebraic operation.

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a substance that takes part in and undergoes change during a reaction

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A chemical equation is the symbolic representation of a chemical reaction in the form of symbols and formulae, wherein the reactant entities are given on the left-hand side and the product entities on the right-hand side. ... The first chemical equation was diagrammed by Jean Beguin in 1615.

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In physics, the law of conservation of energy states that the total energy of an isolated system remains constant—it is said to be conserved over time. Energy can neither be created nor destroyed; rather, it transforms from one form to another.

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The term endothermic process describes a process or reaction in which the system absorbs energy from its surroundings; usually, but not always, in the form of heat. ... The opposite of an endothermic process is an exothermic process, one that releases, "gives out" energy in the form of heat.

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Key Concept:During chemical reactions,atoms rearrange to form new substances that have different properties than the original substance had.

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An exothermic reaction is a chemical reaction that releases energy by light or heat. It is the opposite of an endothermic reaction. Expressed in a chemical equation: reactants → products + energy.

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cause (a substance) to be deposited in solid form from a solution.

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A process that involves rearrangement of the molecular or ionic structure of a substance, as opposed to a change in physical form or a nuclear reaction.

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Substance undergo chemical reactions, which form new substances whose properties differ from the properties of the original substances.

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Chemical reactions introduction | Chemistry of life | Biology | Khan Academy