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Chem 111/125 Dr. McGoldrick’s Lecture Highlights

Chem 111/125 Dr. McGoldrick’s Lecture Highlights. Email: mcgoldrick@ucc.edu vmail: 908 709 7551. Introduction. Course outline Course grading and policies Lab start up Chapter 1 . Chapter 1 ( Kotz ) Overview. Scientific Method Classification: The periodic chart micro vs macro

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Chem 111/125 Dr. McGoldrick’s Lecture Highlights

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  1. Chem 111/125Dr. McGoldrick’sLecture Highlights Email: mcgoldrick@ucc.edu vmail: 908 709 7551

  2. Introduction • Course outline • Course grading and policies • Lab start up • Chapter 1

  3. Chapter 1 (Kotz)Overview • Scientific Method • Classification: The periodic chart micro vs macro • What are the states of matter? (compare states, properties) • Measurement

  4. Scientific Method • Observe ( macroscopic) quantitative vs qualitative • Facts • Hypothesis ( may be microscopic) • Theory • Law

  5. Kinetic- Molecular Theory A “particulate” model Compare- • Gases • Liquids • Solids

  6. Observations, again Recall, macro vs micro • homogeneous, vs heterogeneous • Classifying: • pure vs impure • homogeneous, vs heterogeneous • Elements vs compounds

  7. Matter is made of Atoms • Define AtomTHE CHART • Atomic Symbols • Learn A elements on periodic table for a start

  8. Atoms v. Molecules • Ionic compounds • Molecular compounds • Formulas – subscripts; coefficients

  9. Physical v. Chemical • Properties ( intensive v. extensive) • Separations • Change • examples density D= mass/volume • Density problems see page 22 # 19, 21

  10. Measurement • Metric System (SI) Units • Prefixes to know: milli- centi- deci- kilo- see page 8 for more • Equivalencies to know:454 g. = 1 lb2.54 cm. = 1 in.0.946 l. = 1 qt.

  11. Precision, Accuracy, Error [omit deviation] • Precision- agreement between experimental measurements measured digits are called significant figures • Accuracy - comparison of measured value to a true standard

  12. Sig Fig Recognition • all non zero digits are SF • place holder zeros are NOT SF • trailing zeros are SF • sandwich zeros are SF

  13. Sig Fig Use • Addition & Subtraction-put your work columns-SF can be lost or gained-do NOT predict the answer • Multiplication & Division- predict the answerleast # of SF in the operation = SF in answer

  14. Percents, % Very Generally, Partial ÷ Total x 100 = %Examples of Mass % % water in a food % element in a compound

  15. Conversion Problems • Use factor label method • Use sci notation • Use sig figs

  16. Temp. Scales • Fahrenheit • Centigrade • KelvinBe able to convert any of these

  17. End Chapter 1 Homework Page 20-21# 1,3,5,7,9,11,13 Page 43- 45 # 1, 3, 5, 7, 9, 11, 13, 15, 19, 21, 25, 27, 31

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