Chem 1061 1st Edition Lecture 2 Outline of Last Lecture I 1 1 Some Fundamental Definitions a This is some basic terminology to understand to start this course II 1 4 Measurement and Chemical Problem Solving a 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 Figures III 2 5 Atomic Theory a Subatomic Particles b Isotope IV 2 6 Periodic Table Current Lecture 1 5 Significant Figures How many significant figures you round too comes from the measuring device Always estimate 1 place past measurement I II 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 places i Example 2391 659 21 2 2370 459 but is rounded to 2370 4 because 21 2 has one decimal spot SAMPLE PROBLEMS a Write in Scientific Notation i 131 000 0 1 Answer 1 310000x10 5 ii 0 00047 These 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 4 b 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 4Kg CHAPTER TWO The Components of Matter Classification of Matter on Fig 2 20 pg 78 in textbook Skip Sections 2 4 and 2 5 History I II Mixture a Homogeneous b Heterogeneous Substances a Elements i Atoms b Compounds i Ionic ii Covalent 2 5 Atomic Theory I Subatomic Particles a Electrons e negative charge b Proton p positive charge c Neutron N o neutral charge II Isotopes a Same atomic number but different mass numbers b Atomic mass of element is a weighted average of naturally occurring isotopes 2 6 Periodic Table Horizontal 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 number
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