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an element or compound that cannot be broken down into simpler components and maintain the properties of the orginal substance


substance with atoms that are all alike


substance formed from 2 or more elements in which the exact combination and proportion of elements is always the same

heterogeneous mixture

mixture, such as mixed nuts or a dry soup mix, in which different materials are unevenly distributed and are easily identified

homogeneous mixture

solid, liquid, or gas that contains 2 or more substances blended evenly throughout


homogeneous mixture that remains constantly and uniformly mixed and has particles that are so small they cannot be seen with a microscope


heterogeneous mixture whose particles never settle


heterogeneous mixture containing a liquid in which visible particles settle

physical properties

any characteristic of a material such as size or shape that you can observe or attempt to observe without changing the identity of the material

physical change

any change in size, shape, or state of matter in which the identity of the substance remains the same


process that can separate 2 substances in a mixture by evaporating a liquid and recondensing its vapor

chemical properties

any characteristic of a substance, such as flammability, that indicates whether it can undergo a certain chemical change

chemical change

change of one substance into a new substance

law of conservation of mass

states that the mass of all substances present before a chemical change equals the mass of all the substances remaining after the change

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