CHEM 112 Chapter Notes - Chapter 1: Louis Pasteur, Antoine Lavoisier, Metric System
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Revise hypothesis- if experiments show it is incorrect. Modify theory if experiments show it is incorrect. Theory established- unless later observations show inadequacies in model. Matter: anything that occupies space and has mass, anything made up of atoms. A(cid:374)y (cid:373)atter that (cid:272)a(cid:374) (cid:271)e ide(cid:374)tified as a parti(cid:272)ular (cid:862)type(cid:863) is (cid:272)alled a (cid:862)su(cid:271)sta(cid:374)(cid:272)e(cid:863) Physical properties: characteristics observed without changing basic identity of substance. The key is that molecular structure of substance is not altered e. g. colour, melting point, density. Chemical properties: any characteristic of a substance that involves ability (or inability) of substance to react to form other substances. Intensive properties: characteristic not depending on amount of substance present. They depend on the internal makeup of the substance. e. g. density, temperature, boiling point of a pure substance. Extensive properties: characteristics depending on amount of substance present. e. g. mass, volume, heat content. Homogeneous: a substance composed of one phase and uniform in composition and properties throughout.
