CM-UY 1004- Midterm Exam Guide - Comprehensive Notes for the exam ( 20 pages long!)
6 Oct 2017
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Pure substance: matter composed of one kind of atom r molecule. Mixture: atter composed of different kid of atoms or molecules. Pure substance always have one kind of piece all samples show same properties. Mix have variable composition, different samples show different properties. Physical means: can be used to separate mixture into pure components. Density technique distillation filtration chromatography evaporation centrifugation and decanting means (periodic table) compounds. Molecule: substance that contains two or more atoms, i. e. diatomic elements and. Compounds can only b separated into pure components by chemical means proportions definite shape), or gas (no definite shape or volume) 3 states of matter: solid (definite shape and definite volume), liquid (definite volume no. Changes that alter the state or appearance of matter without altering the composition are. Changes that alter composition of matter and alters composition are chemical changes physical changes. Physical properties are characteristics of matter changed without changing compositions.
