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Glossary of physical science chap. 5

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Tyndall effect
when light passes through a liquid, the light will not be dispersed; an observation showing the presence of a true solution
molecules
a group of atoms held together by strong attractive forces and is the smallest particle that can exist in a compound
suspension
a heterogeneous mixture consisting of small particles spread throughout a liquid or gaseous medium, from which they will eventually settle out
homogeneous mixture
a mixture that appears the same throughout
solution
a homogeneous mixture of two or more substances
heterogeneous mixture
a mixture with different appearances in different parts
colloids
heterogeneous mixtures in which particles of one substance are partially dispersed in another substance
diatomic molecule
a molecule formed of two identical atoms bonded together
molecular formula
gives the number of atoms for each element in a molecule
mixture
a physical combination of two or more pure substances
symbols
a scientific abbreviation for the name of an element; consists of one or two letters with the first letter always capitalized
analysis
the study of materials by breaking them down
pure substances
a substance that is made up of only one kind of particle and is the same throughout
compound
a substance formed when two or more atoms of different elements chemically join together
element
any substance that cannot be broken down into simpler substances by ordinary chemical means
atom
the fundamental particle of an element

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