Chapter 15 Physical Science Study Guide

pure substances and mixtures
two categories materials are placed into
pure substances
matter with a fixed composition
element or compound
two types of pure substances
salt, helium, oxygen, water
90
20
unstable and last for a short period
two or more elements chemically combined
are completely different from original properties
material made of two or more substances physically combined
heterogeneous and homogeneous
mixture in which the different part can easily be seen
salad, taco, permanent press fabric
mixture in which you cannot see the parts
sweet tea, salt water, sugar cookies
homogeneous mixture with particles so small they cannot be seen without a microscope
heterogeneous mixture with visible particles that do not settle
fog, paint, smoke, cool whip, mayonnaise
the scattering of light by a colloid
heterogeneous mixture with visible particles that settle
italian dressing, river water, oil and water
example of suspension
characteristic that can be observed or measured
physical property
size, shape, smell, volume, weight
examples of physical properties
attraction to a magnet, ability to be hammered or drawn into a wire, ability to flow
physical properties that can describe behavior
size, magnetism, appearance
physical properties that can be used to separate a mixture
change in which the identity of the substance remains the same
physical change
phase change, dissolving, painting, changing shape
examples of physical change
distillation
physical changes that can separate a mixture
characteristics that indicate if a substance can change into a completely new substance
chemical properties