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14 terms

PS Chapter 15 quiz

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substance
an element or compound that cannot be broken down into simpler components and maintain the properties of the orginal substance
element
substance with atoms that are all alike
compound
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
solution
homogeneous mixture that remains constantly and uniformly mixed and has particles that are so small they cannot be seen with a microscope
colloid
heterogeneous mixture whose particles never settle
suspension
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
distillation
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