Week 1 Notes
Week 1 Notes CHEM-C 101
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This 2 page Class Notes was uploaded by beckdaysha on Sunday January 10, 2016. The Class Notes belongs to CHEM-C 101 at Indiana University Purdue University - Indianapolis taught by Keith Anliker in Winter 2016. Since its upload, it has received 63 views. For similar materials see Elementary Chemistry 1 in Chemistry at Indiana University Purdue University - Indianapolis.
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Date Created: 01/10/16
C101 Elementary Chemistry IUPUI Week 1 (1/13) Density 1) Definition: Amount of mass packed into volume a) Density = mass/volume 2) Density of water is 1.0 g/mL a) 1g of water = 1 mL b) 1 mL of water weighs 1g 3) Density of Hg (mercury) is 13.6 g/mL a) 1 gal of Hg is like lifting 14 gallons of milk Typical Density Problems: 1) Given 3 variables (D, m, V) a) Given 2, solve for 1 b) Units are IMPORTANT c) Can use density equation OR conversion 2) Example Problem #1 a) Density = 13.6 g/mL 13.6g Volume = 5.50 mL mL × 5.50mL = Mass =? 3) Example Problem #2 a) Density = 0.912 g/mL 1mL Volume =? 75.4g× 0.912g=82.7mL Mass = 75.4 g How does the density of ice compare to liquid water? Density of ice is less than the density of liquid water a) Because it floats b) Ex: Soda can exploding in freezer c) Water is different! i) Solid is less dense than liquid water ii) Other materials may be different Question: C101 Elementary Chemistry IUPUI Week 1 (1/13) Water has a density of 1.0 g/mL, what is the likely density of oil? Since we know that oil will float on top of water, it is LESS DENSE than water. Therefore, the likely density of oil could be between 0.80 g/ mL and 1.0 g/mL. Specific Gravity Density is a ratio of mass and volume Densityof Substance Specific gravity = Densityof H₂O@4℃ 13.6 g/mL a) Specific gravity of Hg=¿ 1.00 g/mL i) All units cancel out Hydrometer a) Useful for testing mixtures i) Tests antifreeze in cars ii)Tests urine iiiTests wine Heat Energy 1 calorie = 4.184 Joules (J) Heat is caused by particles in motion a) Particles = atoms or molecules Heat is a form of Kinetic Energy Heat Up Move Faster More Kinetic Energy Example: a) Microwave ovens are tuned to water molecules i) Molecules tumble, temperature goes up ii) Things without water don’t heat up
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