CHEM 1211 Lecture 3 Outline of Last Lecture I Changing States A How do we change states 1 Adding energy 2 Removing energy II Mixtures A Homogeneous B Heterogeneous III Chemical and Physical Properties A Chemical B Physical C Extensive properties D Intensive properties IV Metric Prefixes V Unites of Measurement A Mass B Weight C Common Conversion Factors a Length b Volume VI How to use Numbers A Significant Figures B Exact Numbers VII Rules A Rule 1 B Rule 2A C Rule 2B D Rule 2C E Rule 3 F Rule 4 G Rule 5 VIII Use of Numbers A Example 1 B Multiplication Division Rule C Perimeter Outline of Current Lecture I Examples II The Unit Factor Method III Percentage A Equation IV Density V Specific Gravity VI Chapter Two Atoms Molecules Ions A Subatomic particles a Protons b Neutrons c Electrons Current Lecture I Examples 1 1 20 x 104 20 12000 20 1 20 x 104 2 23 2 4 6 5 289 18 6 5 289 answer is going to be 3 sig figs II The Unit Factor Method Simple but important method 1 Convert 9 43 yards to millimeters 10mm 1cm EXACT 2 54cm 1 inch EXACT 1 yard 3 feet EXACT Yards feet inches centimeter millimeters 9 43yards x 3feet x 12 inches x 2 54 centimeters x 10 milimeters 8677 656mm 1yard 1 feet 1 inch 2 627mL to gallons 1 qt 0 9463 L 1000mL 1 L 1 centimeter 8 68 x 103mm 1 Gallon 4 qts EXACT 1qt 2 pints EXACT mL L Quarts Gallons 627 mL x 1 L x 1qt x 1Gal 166 Gal 1000ml 0 9463L 4qts 3 2 61 x 104cm2 to f2 A l x w Cm2 in2 f2 2 61 x 104cm2 x 1 in 2 54cm 2 x 1 f 12 in 2 28 09 f2 28 1 f2 4 FINISH YOU WILL SEE THIS PROBLEM SOMEWHERE ELSE 2 61f3 to cm3 V l x w x h Cube l w h Vcube a3 A V Cube III Percentage A Equation Amount of Substance x 10x x 2 pph Total amount of sample x 3 ppt x 4 ppm PPH percent in part per hundred 1 335 g sample of 29 5 g of iron What is the of iron in the ore Fe 29 5 335g x 102 8 81 Fe IV Density Density mass volume It is an intensive property M same V change D different water and ice more dense 1 125 g for rxn What volume do you need D 1 32 g mL V 125g 1 32 g mL 94 7mL V Specific Gravity UNITLESS SG Density of substance density of water 1 00 at Room Temp 1 31 0 g piece of chromium dropped in 5 00 mL of water What is SG of chromium if water level rises to 9 32 mL V 9 32 mL 5 00 mL V 4 32 mL D 31 0g 4 32 mL 7 18 g mL SG 7 18 1 00 7 18 VI Chapter Two Atoms Molecules Ions A Subatomic particles a Protons Located in the Nucleus Mass 1 672623 x 10 24 g Mass 1 007 u atomic mass unit amu Defines an element Atomic number of protons Z b Neutrons No charge Located in the Nucleus Mass 1 009 u c Electrons Located in the space around the nucleus Relative mass 0 0005 u of protons of electrons
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