CHM1045 Lecture 1 Outline of Current Lecture I Hypothesis II Law III Theory IV Substance V Types of Matter i Mixture ii Element iii Compound I Types of Changes i Physical ii Chemical iii Mass iv Weight Current 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 principles Types of Matter 1 Mixture combination of 2 or more substances retain their identities i Homogenous same throughout ii Heterogeneous different Distillation used in homogenous boils out 1 substance 2 Element can t be separated 114 i 82 naturally ii 32 created chemically 3 Compound substance composed of atoms of two or more elements Can only be separated in their pure forms Types of Changes 1 2 Physical doesn t alter ex ice melting 3 Chemical alter composition ex Hydrogen formed in air to form H2O i Extensive matter how much a Mass b Volume ii Intensive doesn t matter how much a Temperature b Density 4 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 mega
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