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Chem Unit 1

Chemistry chemisty deals with the properties and reactions of subsatnces
matter matter is anything that has mass and occupies space. Exists in three pashes: solid, liquid, gas
Pure Substances each of which has a fixed composition and a unique set of poroperties
mixtures contains two or more substances combined in such a way that each substance retains its chemical identity
element a type of mater tha cannot be broken down into two or more pure substances. There are 15 elements and they are identified by their symbols.
Compounds a pure substance that contains more tha 1 element. have a fixed compisitionand a given compound contains teh same elements inthe same percentages.
Homogeneous a mixture in which the compostion is teh same throughout.
heterogeneous mistures in which the compostion varies throughout.
Filltration, Distillation, Chromatagraphy lab methods used to separate the components of a mixture
Precision how close answers are to echother (reproducibility)
Accuracy how close answer is to the accepted value
conversion factor technique to change one unit to another using a conversion factore.
Intensive property used to identify a subsatnce, independent of amount
Extensive properties depend on amount
Chemical Property ovbserved when the substance changes to a new one
Physical property observed without changing the substance to a new one
saturated solution maximun amount of solute is dissolved at a given temp.
unsaturated solution more solute can dissolve at a given temp.
supersaturated solution more than maximum amount of solute is dissolved at a given temp.
Created by: cnov232