CHM1045 Lecture 1 Outline of Current LectureI. HypothesisII. LawIII. TheoryIV. SubstanceV. Types of Matteri. Mixtureii. Elementiii. CompoundI. Types of Changesi. Physicalii. Chemicaliii. Massiv. WeightCurrent Lecture- Hypothesis- tentative explanation- Law: educated guess ex. Force=mass * acceleration- Theory: unifying principle that explains a body of facts ex. Theory of evolution- Substance: (ex. liquid nitrogen) form of matter that has distinct principlesTypes of Matter: 1. Mixture- combination of 2 or more substances; retain their identitiesi. Homogenous- same throughoutii. Heterogeneous- different - Distillation: used in homogenous boils out 1 substance 2. Element- can’t be separated (114) i. 82 naturallyii. 32 created chemically3. Compound: substance composed of atoms of two or more elementsCan only be separated in their pure formsTypes of Changes1.2. Physical- doesn’t alter ex. ice melting3. Chemical- alter composition ex. Hydrogen formed in air to form H2Oi. Extensive- matter how much a) Mass b) Volumeii. Intensive: doesn’t matter how mucha) Temperatureb) Density4. Mass: measure of the quantity of matter - 1 kg= 1000g 1*103-5. Weight: depends on gravity weight = C*Mass- Know SI units (kilo, deci, milli, micro,
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