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U of M CHEM 1061 - Significant Figures, Atomic Theory, and The Periodic Table

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Chem 1061 1st Edition Lecture 2Outline of Last Lecture I. 1.1 Some Fundamental Definitionsa. This is some basic terminology to understand to start this course.II. 1.4 Measurement and Chemical Problem Solvinga. This is a beginning into problem solving in chemistry using conversion factors to go between different measurement units.Outline of Current Lecture II. 1.5 Significant FiguresIII. 2.5 Atomic Theorya. Subatomic Particlesb. IsotopeIV. 2.6 Periodic TableCurrent Lecture1.5 Significant Figures-How many significant figures you round too comes from the measuring device.-Always estimate 1 place past measurement.I. In Calculations:a. Multiplication/Division: Keep the lowest number of Significant Figures.i. Example. 5652.99x1.2=6788.588 but is rounded to 6800 because 1.2 has 2 significant figures and 5652.99 has 6 significant figures.b. Addition/Subtraction: Keep lowest number of decimal placesi. Example: 2391.659-21.2=2370.459 but is rounded to 2370.4 because 21.2has one decimal spot.II. SAMPLE PROBLEMS:a. Write in Scientific Notationi. 131,000.01. Answer: 1.310000x10^5ii. 0.00047These 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.1. Answer: 4.7x10^-4b. The density (density=mass/volume) of Lead (Pb) is 11.3g/cm^3. How much does 1.00m^3 block of Pb weigh in Kg?i. Answer:11300kg or 1.13x10^4KgCHAPTER TWO: The Components of MatterClassification of Matter on Fig 2.20 (pg.78) in textbook.**Skip Sections 2.4 and 2.5 (History)I. Mixturea. Homogeneousb. HeterogeneousII. Substancesa. Elementsi. Atomsb. Compoundsi. Ionicii. Covalent2.5 Atomic TheoryI. Subatomic Particlesa. Electrons (e^-) negative chargeb. Proton (p^+) positive chargec. Neutron (N^o) neutral chargeII. Isotopesa. Same atomic number, but different mass numbers.b. Atomic mass of element is a weighted average of naturally occurring isotopes.2.6 Periodic TableHorizontal Rows of elements are called PERIODS and have different properties than other periods.Vertical Columns of elements are called ROWS and have similar properties.The Periodic table is organized by increasing atomic


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U of M CHEM 1061 - Significant Figures, Atomic Theory, and The Periodic Table

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