Week One Friday September 4, 2015
Week One Friday September 4, 2015 Chem 105
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This 3 page Class Notes was uploaded by Marisa Loken on Monday September 7, 2015. The Class Notes belongs to Chem 105 at University of Wisconsin - Stevens Point taught by Dr. Riha in Fall 2015. Since its upload, it has received 144 views. For similar materials see Fundamental Chemistry in Chemistry at University of Wisconsin - Stevens Point.
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Date Created: 09/07/15
Week One Friday September 4 2015 Chemistry 105 What is matter Anything that has mass Anything but energy Takes up space Smallest building blocks of matter Atomsljsmall particles that make up matter building blocks of matter Molecules Groups of 2 or more atoms that join together in speci c orientations Three States of Matter Solid 0 Macroscopic properties Example Ice De ned shape De ned volume Does not ow 0 Molecularmicroscopic properties Atoms tightly packed in rigid structure Atoms don39t move Liquid 0 Macroscopic Properties Takes shape of a portion of the container it occupies De ned volume Flow 0 MolecularMicroscopic Properties Less ordered arrangement Atoms and molecules are close together in no order Atoms are constantly in motion Gas 0 Macroscopic Properties Fills container completely No shape or volume Can expand and compress Flows o MolecularMicroscopic Properties Atoms are spread apart Atoms are in motion at high speeds Can we separate matter by a physical process Physical process 0 Change of matter that does not change the chemical identity of any of its components 0 Example taking a lid off a water bottle Mixture 0 can be separated by a physical process Pure substance 0 Cannot be separated by a physical substance 0 Example water and table salt Heterogeneous mixture 0 Does not have a uniform composition 0 Example rock and oar sh in lakes Homogeneous mixture 0 Does have a uniform composition 0 Example unpurified water salt water air Chemical process 0 A process that changes the chemical identity of a substance Compound 0 Separate it by a chemical process into 2 or more different elements 0 Contains two or more kinds of atoms 0 Law of constant composition de nite proportions The observation that the elemental composition of a compound is always the same 0 Example water and carbon dioxide Element 0 Cannot be separated chemically 0 Can take on different shapes 0 Composed of one kind of atom 0 There are 18 known elements Properties of Matter Chemical properties 0 Property that can only be observed by reacting the substance Example ammability reactivity Physical properties 0 Property can be observed without chemically changing the substance Example color mass size malleability temperature hardness texture ductile boilingmelting points density Intensive property 0 Independent of the amount of substance present Example density meltingboiling point color refractivity Extensive property 0 Depends on the amount of substance present Example size volume mass radioactivity shape Physical and Chemical Change Physical change 0 Substance changes its physical appearance but not composition 0 All changes of state Chemical Change 0 Substance is transformed into a chemically different substance Do problems 11 111 115 117 119 From the text book for practice
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