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A state of matterAnything that occupies space and has mass; contrasted with energy. in which the atomic-scale particles remain close together but are able to change their positions so that the matter takes the shape of its container
The step in a reaction mechanismThe set of elementary steps by which a reaction is thought to occur; each individual step corresponds to either a bimolecular collision or unimolecular reaction of a single molecule. that by its relatively slow rate limits the overall rate of a reaction; also called rate-limiting stepThe step in a reaction mechanism that by its relatively slow rate limits the overall rate of a reaction; also called rate-determining step..