chem - Chapter 1 1.5 A-7.5cm, 4 significant figures B 140C,...

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Chapter 1 1.5 A-7.5cm, 4 significant figures B 140◦C, 2 significant figures 1.10A-Homogenous Mixture B- Homogenous Mixture C- Pure Substance D-Heterogenous Mixture 1.17 The physical properties of the substance is that it is a silvery white, lustrious metal, it has a melting point at 649◦C , a boiling point of 1105◦C, and a denisty of 1.738g/cm 3 at 20◦C. Other physical properties are that it can be pounded into thin sheets or drawn into wires and it is a good conductor of electricity. The chemical properties are that it burns in air to produce a intnse white light and reacts with chlorine to give a bright white solid. 1.29 A- 2245 ml g 45 5 . 38 .86 g/ml is the calculated denisty so therefore, the probable identity of the substance is toluene. B- 2245 g ml x g 114 . 1 1 45 40.4ml C- 5.00cm x 5.00cm x 5.00cm x 2245 3 00 . 1 90 . 8 cm g 1.11 x 10 3 grams 1.33 A-(62 o F -32) x 5/9=17 o C B-216.7 o C x 9/5 + 32=422.1 o F C- 233 o C+273= 506 K D- (315K-273) x 9/5 +32= 108 o F E- (2500 o F-32) x 5/9 + 273= 1644 1.38 A-5 B-3 C-4 D-4 E-6 1.39 A-1.025 x 10 2 B-6.570 x 10 5 C- 8.543 x 10 -4 D- 2.579 x 10 -4 E- -3.572 x 10 -2
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1.42 A- -2333.58 B- 8.2602 x 10 7 C-33846 D-762000 1.45 A. .0076ml x ml L 1000 1 = 76ml B. 5.0 x 10 -8 m m nm x 1 10 1 9 =50 nm C. 6.88 x 10 -5 ns x ns x s 9 10 1 1 =6.88 x 10 -4 s D. .50lb x lb g 1 6 . 453 =230 g E. 1.55kg/m 3 x 3 3 1000 1 L m x kg g 1 1000 = 1.55g/L F. 5.850gal/hr x gal L 1 79 . 3 x s hr 3600 1 = 6.151 x 10 -3 L/s 1.55 A. 23.73g x .9 x g ounce 1 . 31 1 x $1.18=$.91 B. $25 x 30 . 5 $ 1 silver ounce x silver ounce g 1 1 . 31 x silver ounce Dollar Morgan 1 . 24 1 = 6.09 Morgan Silver Dollars. 7 Morgan Silver Dollars are required.
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Chapter 2 2.4 Diagram (i) represnts the ionic compound because it is in a 3 dimiensional shape and therefore Diagram (i) is a molecular compound since it is not in a 3 dimensional shape. 2.5 IF 5 This compound is molecular and it is called Iodine Pentafluoride. 2.7. Dalton’s atomic theory states that a compound always has the same relative number and kind of atoms. So regardless of the source of the water, the 1.0g of water must have .111g of hydrogen and .999g of oxygen. 2.11 J.J Thompson’s experiment with the cathode ray demonstrated that the cathode rays were deflected by both the magnetic and electric fields in a way consistent with there being a stream of negative electrical charge. 2.15 A. 1.9 A o x o A m 1 10 10 - x m nm 1 10 9 =19 nm. 19nm x nm pm 1 10 = 190pm B. 1.0mm x mm m 0 . 1 10 3 - x m A o 1 10 10 - x o A x atom kr 9 . 1 2 1 =2.6 x 10 6 atoms. C. (1.9 A o x 10 -10 m) 3 x 4pie/3= 2.9 x 10 -29 m 3 x 3 6 1 10 m cm = 2.9 x 10 -23 cm 3 2.18. A. False. The nucleas has most of the mass of an atom but comprises very little of the volume of an atom B. True. C. False, the number of electrons in an atom equals the number of protons in an atom. D. True 2.20 31 15 X & 32 16 X
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2.24 Symbol 121 Sb 103 Rh 108 Sr 127 Te 239 Pu Protons 51 45 38 52 94 Neutrons 70 58 50 75 145 Electrons 51 45 38 52 94 Mass number 121 103 108 127 239 2.33 A 23.98504 x .7899 - .1000 x 24.98584 + .1101 x 25.98259=24.31 amu B. Mass Spectrum Mg . 24 25 26 2.39. Empircal formula tells us the relative number of atoms of each element in the cmopound.
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This note was uploaded on 09/18/2010 for the course CHEM 201 taught by Professor Robert during the Spring '10 term at El Paso Community College .

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chem - Chapter 1 1.5 A-7.5cm, 4 significant figures B 140C,...

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