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