sept 4 chem notes

# sept 4 chem notes - Chemistry Instruction 103 notes...

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Chemistry Instruction 103 notes September 4, 2007 METRIC System – units to memorize ****DECI=1/10; CENTI=1/100; AND MILLI= 1/1000 and KILO=1000 LENGTH-The Metric Standard is the meter 1 Meter=39.37 INCHES – a little longer than a yard ****2.54 cm=1 inch and 1 METER=100 cm or 1000mm Mass- the Standard of mass in the gram ****453.6 grams= 1 POUND Problem examples Density=mass/unit volume (D=M/V) any mass, any volume. It is a physical property that you can observe. It is a physical property that you can observe, think of hot and cold chocolate syrup. Mass=weight Blowing up of Challenger was a chemical change Higher molecule weight means less volatile and less smelly. You already know a lot about density, gasoline floats on water DGasoline= .8 Grams/mL Weight=Mass when the object is the same distance from the center of the earth 1) How many liters of gasoline would you need to fill a 15 gallon gasoline tank? 15 gallons x 4 quarts/gallon x 1 L/1.06 gallons=56.6 (round to 57 *just for fun*) 2) Using the answer to question 1 and knowing that the density of gasoline is 0.8Grams/mL, calculate the mass of gasoline in grams and pounds . D=M/V so M=DV. D=.8 grams per milliliter. V=57 liters. 57*.8=45,600 grams. 45,600*1 pound/454 grams= 100.44 pounds 3) Temperature increases from 98.6 degrees F to 100 degrees F. Calculate the temperature in C degrees for 100 degrees F. C=5/9 (F-32) =5/9 (100-32) =37.7 degrees ------------------------------- 4) 100yds * 3ft/yd * 12 inches/1 ft* 2.54 cm/1 inch * 1m/100cm = 91.44m 5) For a gallon of milk, why can you use the density of water for problems associated with milk.

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Milk is mostly water. 6) A typical over-the-ocean jet-aircraft can hold 51,000 pound of fuel. Express this # in grams. 23154000 First element in a compound, the positive element, keeps its name. The second element, the negative element, has “ide” in the end as in Chlorine to Chloride. In a compound you can have any # of atoms. Al +3 and Cl-1 becomes AlCl3 Al+3 and O-2 becomes Al2O3 Democritus – small units of matter called atoms which cannot be cut into smaller pieces. Aristotle- 4 major elements: Air, Earth, Fire, and Water. 4 minor elements: Hot, Cold, Wet, and Dry. Through the forces of love and hate all other matter was made. 1850s: Julius Plucker, John Hittorf, Eugen Goldstein, William Crookes – demonstrated that the particle that they could generate from electricity in a vacuum had a mass. A charge, and behaved as both a wave and a particle. –The Electron (-) 1890s J. J. Thompson calculated the charge and the charge to mass ratio and the proton (+). CFL: compact fluorescent light Most atoms do not give off color 1905: Albert Einstein proved that matter and energy were interconvertible 1910: Niels Bohr calculated the orbit of hydrogen 1911: Ernest Rutherford experimentally proved that the nucleus exists. 1935: Otto Hahn and Lisa Meitner discovered the neutron 1940: J. Robert Oppenheimer, Enrico Fermi, Glenn Seaborg, Edward Teller were the main driving forces in nuclear energy.
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