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Chapter 15

QuestionAnswer
substance element or compound that cannot be broken down into simpler components and maintain the properties of the original substance.
element substance with atoms that are all alike.
compound substance formed from two 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 two 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 a homogeneous, noncrystalline substance consisting of large molecules or ultramicroscopic particles of one substance dispersed through a second substance. Colloids include gels, sols, and emulsions; the particles do not settle and cannot.
Tyndall effect the phenomenon in which light is scattered by very small particles in its path; it makes a beam of light visible; the scattered light is mainly blue.
suspension the system of springs and shock absorbers by which a vehicle is cushioned from road conditions.
physical property any property used to characterize matter and energy and their interactions.
physical change phase change: a change from one state (solid or liquid or gas) to another without a change in chemical composition.
distillation the action of purifying a liquid by a process of heating and cooling.
chemical property a property used to characterize materials in reactions that change their identity.
chemical change chemical process: (chemistry) any process determined by the atomic and molecular composition and structure of the substances involved.
law of conservation of mass conservation of mass: a fundamental principle of classical physics that matter cannot be created or destroyed in an isolated system.
Created by: luisgomez1