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1031_thomas_exam_1_fall_2005

1031_thomas_exam_1_fall_2005 - W.103 I C071 GENERAL...

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Unformatted text preview: W (.103 I C071 GENERAL CHEMISTRY EXAM 1 Fall Semester, 2005 1. TEST CODE 0 'te) Name PLEASE FOLLOW RUCTIONS CAREFULLY TO ENSURE THAT THE GRADING OF. THIS EXAMINATION IS DONE IN A TIMELY FASHION I- USE # 2 PENCIL ONLY 2. ON YOUR ANSWER SHEET UNDER OPTIONAL CODES, TEST CODE, WRITE IN 3 AND BLOCK # 01 3. ALSO WRITE THE COLOR OF THE EXAMINATION ACROSS THE TOP OF THE ANSWER SHEET. 4. BLOCK IN YOUR NAME AND YOUR IDENTIFICATION NUMBER (SOCSECNO) ON THE ANSWER SHEET. 5. SIGN YOUR NAME ON THE BACK OF THE ANSWER SHEET IN THE PLACE MARKED SIGNATURE. 6. BE SURE TO CHECK YOUR ANSWER SHEET PERIODICALLY TO MAKE SURE . YOU ARE FILLING IN THE BLOCKS THAT YOU INTEND TO. 7. DO NOT LEAVE ANY BLANKS, YOU MAY GET LUCKY. 8. HAND IN BOTH YOUR ANSWER SHEET AND TEST BOOKLET. Avogadro Number 6.02 x 1023 Gas Constant R = 0.0821 L atm K" moi“l : 8..”314]K"r1001‘1 Placnk Constant h = 6.626 X 10'34 J8 C = 3.00 X108 ms" F = 96,500 C STP 1 atm = 760 mmHg '—" 760 Torr = 101.3 kPa and 0°C Kb= 051°C m" Kf= 186°C m" ' Name: Date: 1. A naturally occurring element consists of three isotopes. The data on the isotopes: isotope #1: 46.972 u, 69.472% isotope #2: 48.961 u, 21.667% isotope #3: 49.954 11, 8.8610% What is the average atomic weight of this naturally occurring element? A) 47.667 11 B) 47.699 u C) 48.629 u D) 48.667 u E) 48.961 u 2. Which one of the following is the correct formula for the compound ferrous sulfate? A) FeSO4 B) Fe(SO4)2 C) FezSO4 D) Fe2(SO4)3 E) Fes(304)2 . The weight of a body varies according to the force of gravity exerted on the body. A) True B) False C) D) E) b) 4. A chemical reaction must be used to separate A) air into oxygen, nitrogen, and other components B) a compound into its elements C) gases from liquids D) a mixture into its components E) solids from liquids 5. Which one of the following is a correct name for the compound Hg2Clz? A) dimercury dichloride B) mercuric chloride C) mercuryfl) chloride D) mercuryfll) dichloride B) there is no correct name, the formula should be HgCl Page 1 10. . A neutral iodine atom has an atomic mass number = 131. Which description below fits this atom? A) 39 protons, 78 neutrons, 39 electrons B) 53 protons, 78 neutrons, 53 electrons C) 53 protons, 78 neutrons, 54 electrons D) 53 protons, 131 neutrons, 53 electrons E) 53 protons, 131 neutrons, 54 electrons Iron has a density of 7.86 g cm‘3. How many pounds does a block of iron with a volume of 1.65 cubic feet weigh? lpound = 0.4536 kg, 1 foot = 12 in., l in. = 2.54 cm. A) 810 pounds B) 0.871 pounds C) 871 pounds D) 491 pounds E) 3.01 pounds Which one of the following does not involve a chemical change? A) a fish that is left for some time in an unrefrigerated place decomposes B) apple juice which is left in an open bottle fennents C) a loaf of bread rises and its volume expands when it is baked in an oven D) when a lake starts to freeze in winter, ice is formed on the surface B) when sugar is fermented under certain conditions, alcohol is produced . The SI prefixes mega and nano represent, respectively: A) 109 and 10-6 B) 10‘6 and 109 C) 106 and 10-9 D) 106 and 109 E) 10-6 and 10—9 A special alloy melts at 874 K. What is this temperature in ““5? A) 302 °F B) 365 OF C) 1050 0F D) 1082 °F E) 11 14 °F Page 2 11. 12. 13. 14. 15. Which set below includes only alkali metal elements? . A) gallium, germanium, iron, barium, tellurium B) lithium, sodium, potassium, rubidium, francium C) magnesium, gallium, fluronium, missourium, neptunium D) radium, polonium, actinium, platinum, selenium E) uranium, francium, gallium, plutonium, titanium How many micrometers are there in 3.672 km? A) 3.672 x 106 B) 2.723 x 10‘7 C) 2.723 x 10‘4 D) 3.672 x 109 E) 3.672 x 103 Which one of the following elements exists as a diatomic molecule when it is in the free state? A) C B) P C) s D) Br E) Ni Sodium and cesium are an example of two elements which belong to the same A) class B) generation C) grade D) group B) period The number 1.050 x 109 has how many sifnificant figures? A) 2 - B) 3 C) 4 D) 9 B) 13 Page 3 . The density of copper metal is 8.92 g/cm3. Given that 1 foot(ft) = 12 inches(in), 1 in = 2.54 cm, and 1 pound (lb) : 453.6 g, what is the density of copper in lb/ft3? A) 18.31b/ft3 ' B) 146 lb/ft3 C) 253 lb/ft3 D) 272 lb/ft3 E) 317 lb/ft3 . The boiling point of barium is 725 °C. Determine the equivalent value in °F A) 435 °F B) 1337 C’F C) 1247 0F D) 1362 OF E) 1273 oF . Density is one of the extensive properties of matter. A) True B) False . A sample of zinc metal (density : 7.14 g cm'3) was submerged in a graduated cylinder containing water. The water level rose from 162.5 cm3 to 186.0 cm3 when the sample was submerged. How many grams did the sample weigh? A) 168 g B) 22.7 g C) 26.1 g D) 48.8 g E) 3.29 g . What is the correct name for the C2H302' ion? A) acetate ion B) hydrocarbonate ion C) monocarbonate ion D) oxalate ion E) sucrose ion Page 4 21. Given the following densities at 25°C: magnesium: 1.7 g/Cm3 graphite: 1.8 g/crn3 iron: 7.9 g/cm3 A block of iron has a mass of 826 g. What is the mass of a block of magnesium that has the same volume as the block of iron? A) 1,400 g B) 3,800 g C) 830 g D) 180 g E) none of them are within 10 g of the right answer. 22. The correct formula for the compound formed from calcium ion and acetate ion is A) CaC2H302 B) Ca2C2H302 C) Ca2(C2H302)4 D) Ca(C2H302) 2 E) Ca(C2H302) 3 23. The species shown below which has 24 protons is A) EC?" B) §§Mn C) 3ng D) :fSc E) EV 24. When barium metal reacts with chlorine gas it forms an ionic compound, BaClz. In the course of the reaction, each Ba atom A) loses two protons B) loses two electrons C) gains two protons D) gains two electrons E) loses two neutrons 25. Some molecules move with speeds approaching the "escape velocity' from Barch, 7.0 miles per second. What is the in cm/h? Given 1 mile = 1609 m = 5280 ft. A) 313 cm/h B) 4.1x1050m/h C) 4.1 x 109 cm/h D) 1.1‘11110g cm/h Page 5 ...
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