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CSU CHEM 111 - Properties of Matter

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Molecular ViewChemical or molecular formulaNotation for representing elements and compoundsConsists of symbols of constituent elements , and subscripts identifying the number of atoms of each element in one moleculeStructural formulaA drawing of the atoms in a molecule that indicates where chemical bonds are locatedChemical FormulasChemical bonds link atoms together to make moleculesChemical formulas can be represented in four waysMolecular formulasStructural formulasCondensed structural formulasBall-and-stick modelsSpace-filling modelsC.O.A.S.T.Collect and OrganizeIdentify key concepts, skills required to solve problem, and assemble information neededAnalyzeWhat is it asking, what is the information that I have been given, and how can I use this information to answer the question?SolvePerform calculations, check units, etc.Think about itIs this answer reasonable? Are the units correct?Making MeasurementsMeasurementsEssential99.999% of the time everything should have a unitStandardization of the units of measurement is essential.Basic SI Units, Commonly Used Prefixes for SI Units(Kilo, centi, milli, micro, nano)Significant FiguresInclude all digits known with certainty plus one digit that is uncertainCHEM 111 1nd Edition Lecture 3 Outline of Last Lecture I. Basic Chemistry DefinitionsII. States of MatterIII. Classes of Matter Outline of Current Lecture II. Terms III. C.O.A.S.T.IV. MeasurementsV. Basic SI UnitsCurrent LectureIntensive Property- A property that is independent of the amount of substance present- Ex: color, melting pointExtensive Property- A property that varies with the amount of the substance- Ex: volume, massPhysical Property- A property of a substance that can be obesreved without changing it into another substance- Ex: Boiling waterChemical Property- A property of a substance that can be observed by only reacting it to form another substancePhysical Change- A change in the physical form (or state)Chemical Change- A change in which one or more substances are converted into one, or changing the composition of the moleculeDensity- A measure of how tightly packed particles are in a substance- Mass of a substance per unit volume of the substance- Density = mass/volumeScientific Method- General explanation of widely observed phenomenaThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.- Hypothesis- Scientific theoryo A theory that has a lot of data collected on it and a lot of testing with significant data to support that- Theory vs. Law: Why s/g happens vs. what will happen Molecular View- Chemical or molecular formulao Notation for representing elements and compoundso Consists of symbols of constituent elements , and subscripts identifying the number of atoms of each element in one molecule- Structural formulao A drawing of the atoms in a molecule that indicates where chemical bonds are located Chemical Formulas- Chemical bonds link atoms together to make molecules- Chemical formulas can be represented in four wayso Molecular formulaso Structural formulaso Condensed structural formulaso Ball-and-stick modelso Space-filling models C.O.A.S.T.- Collect and Organizeo Identify key concepts, skills required to solve problem, and assemble information needed- Analyzeo What is it asking, what is the information that I have been given, and how canI use this information to answer the question?- Solveo Perform calculations, check units, etc.- Think about ito Is this answer reasonable? Are the units correct? Making Measurements- Measurements o Essential o 99.999% of the time everything should have a unit- Standardization of the units of measurement is essential. Basic SI Units, Commonly Used Prefixes for SI Units (Kilo, centi, milli, micro, nano)- Significant Figureso Include all digits known with certainty plus one digit that is


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CSU CHEM 111 - Properties of Matter

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