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Chem Unit 1
Question | Answer |
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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. |