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A change from one state (solid or liquid or gas) to another without a change in chemical composition
The change of substances into other substances through a reorganization of atoms;A chemical reaction
A characteristic that can be observed or measured without changing the identity of the substance
A characteristic of a pure substance that describes its ability to change into different substances
A representation of a chemical reaction showing the relative numbers of reactant and product molecules
A substance that initiates or accelerates a chemical reaction without itself being affected
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