Chem 141 Chapter 1

Chem 141 Chapter 1 - 1-1Silberberg Chapter 1Chemistry...

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Unformatted text preview: 1-1Silberberg Chapter 1Chemistry 141Summer 2008Dr. Ben Tovrog1-2Silberberg Chapter 1 Problem AssignmentThese problems are for your practice. They will not be collected or graded. It is essential you develop the ability to work one-star and two-star problems in a fast and efficient manner. Most have answers given in the back of the text. After you master the 1 and 2 star problems I encourage you to complete three-star problems. Easy and Medium1.6, 1.7, 1.23, 1.26, 1.28, 1.30, 1.32, 1.34, 1.36, 1.38, 1.40, 1.42, 1.45, 1.52, 1.54, 1.56, 1.58, 1.60, 1.64, 1.66, 1.68, 1.73. Hard1.82, 1.92, 1.93, 1.96. 1-3Chapter 1 : Keys to the Study of Chemistry(Bold Items Highest Priority)1.1Some Fundamental Definitions1.2Chemical Arts and the Origins of Modern Chemistry1.3The Scientific Approach: Developing a Model1.4Chemical Problem Solving1.5Measurement in Scientific StudyDensity1.6Uncertainty in Measurement: Significant FiguresScientific Notation---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------1-4DefinitionsMatteranything that has mass and volume -the stuff of the universe: books, planets, trees, professors, studentsForms:Solids Rigid, incompressibleLiquid Fluid, incompressibleGas Fluid, compressiblePhysical Change Change in the form of the matter but not its chemical identityChemical Change Change in which a new kind of matter (with different composition) is formed. Physical Property A characteristic that can be observed without changing its composition or chemical identityChemical Property A characteristic exhibited when a change to a new and different kind of matter occurs1-5Some Characteristic Properties of CopperTable 1.1Physical PropertiesChemical Propertiesreddish brown, metallic lustereasily shaped into sheets(malleable) and wires(ductile)good conductor of heatand electricitydensity = 8.95 g/cm3melting point = 1083Cboiling point = 2570Cslowly forms a basic blue-greensulfate in moist airreacts with nitric acid and sulfuric acidslowly form a deep-bluesolution in aqueous ammonia1-6Sample Problem 1.1Distinguishing Between Physical and Chemical ChangePROBLEM:Decide whether each of the following process is primarily a physical or a chemical change, and explain briefly:PLAN:Does the substance change composition or just change form?SOLUTION:(a) Frost forms as the temperature drops on a humid winter night.(b) A cornstalk grows from a seed that is watered and fertilized.(c) Dynamite explodes to form a mixture of gases....
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Chem 141 Chapter 1 - 1-1Silberberg Chapter 1Chemistry...

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