Exam 1 Test Form A

Exam 1 Test Form A - apt am[my 1 At room temperature and...

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Unformatted text preview: apt am [my @ 1) At room temperature and pressure, substance A is a stable liquid and substance B is a gas. Why? A) The particles of A have less kinetic energy than the particles of B The attractive force between particles of A is greater than that between particles of B. C) The mass of particles of A is greater than that of particles of B D) Particles of A must be further apart than particles of B E) answers B and C. 2 . At constant temperature if the volume of a gas is doubled, the pressure would: A) e half as large B) double C) be four times as large D) remain the same 3) The atomic mass of one argon (Ar) atom is 40.0 amu. A 40.0 g sample of argon gas then contains A) 1 atom B) 40 atoms @602 x 1023 atoms D) 2.41 x 1025 atoms 4) What is the mass of one mole of Ca(0H)2 ? (Ca= 40. 0 = 16 H =1.0 g/mol) A) 57g B) 114g @ 74g D) 58 g 5) Whit: of the following is an extensive property of coffee in a mug? @ total mg of caffeine B) cream per mL of coffee C) color D) temperature E) percent sugar 6) Which of the following representations is a mixture of three different compounds? Geo 0:0 0.8” °: 90 0” ° Qs o0 @ ® 7) The circle on the left shows a magnified view of a very small portion of liquid water in a closed container. Key ‘5 Water What would the View show after the water magnified evaporates? Evaporaze 4 Water ‘51gi {/r;~\ fad—:Eb‘ 1;" '" fj)| C a II ( raga—u} \ézgpj a / (E) (h) #éé'g’gt = 9.3-7 mm 8) You wonder if a gold-colored necklace is actually gold. You fill a graduated cylinder with 25.0 mL water and placed the necklace in, pushing the water up to 72.3 mL. You then weighed the necklace and foand it to be 466.85 g. Given the following densities, identify the met (gold : 19.3 g/mL, copper = 8.86 g/mL, ronze = 9.87 g/mL B) copper (C) bronze) D) some other metal E) insufficient data 9) When you did the experiment in the previous problem you accidentally trapped a big bubble of air in the necklace when pushing it under the water. What effect would that have the f“ l d ‘ ? w 0!] "la CHSIty .1) 5 50 D A) higher @ C) no effect since the necklace weighs a lot more than air. A) gold 10) Instant coffee is made by brewing regular coffee, freezing it at a very low temperature and then lowering the pressure to remove the water. This separation is a form of and the distinguishing characteristic is the materials’ . A) Filtration, size of the pmicles®3istillatiom boiling point (volatility) C) Extraction, solubility D) C omatography, attraction between materials emew-waxwywzmmwWegmnamimwammmmmmwmammwwwmmm-WWMWWWWWWW 11) @ What measurement would be best for the insect? a. 1 in b. 1.5 in ‘31 I?” d. 1.52 m 9. none of the above / 7/ % V2,“; Vs \ 12) Two substances are at the same temperature. A molecule of substance A is mass 4 amu and a molecule of substance B is mass 12 amu. If the average speed of A is 100 m/sec what is the average speed of B in m/seo? LIL ( 1 5D?" 3 [Z V; VB): A) 100 B) 173 C)33.3 D) E)300 57.7 /* filmva/ 15/:- '% 13) The empirical formula for a substance is found to be CH30. The formula weight of the 5/ substance is found to be 93 amu. What is the molecular formula? (C Hi a) A) 01-130 B) 02111502 C) (331130 D)CgH90 3y 3 14) Moving from pt A to B to C on the phase diagram, what phase transitions are involved in order? if A) melting then sublimation B) boiling then freezing C boiling then condensing (g ublimation then condensing A 954.59%? (T éZGOC-Jflb' figfl‘f 73 «a? P 1’ M ? D 6 0 “[3 C) C/ 15) When liquid water at 0 C freezes the temperature stays at 0 C during the entire process. Why? A) The kinetic energy is dropping. While water freezes it absorbs the coid from the surroundings 'le water freezes it releases energy to the surroundings The temperature of water goes down, but not the ice. 16 2 points -- How many significant figures are there in the following numbers: 0.01; 1001.0; 0.000020? A) 1,5,2 Free Form Answers. DO NOT mark anything for these on the Scantron. The TA’s wili grade and give you full or partial credit. Only your work here will be graded. Show ail work for any partial credit. 13) 1,4,2 C) 2,4,6 D) 2,1,6 Nam l T e ionic or molecular LITHW revive '* new... aw- m o Ilium/W owe haéflflt/ 18) (10pts)Complete the following table:—- wfi/T 67% 0g 15/6 F/ Z— Compound Mo} Mass Grams Moles Moiecules Total (given) M Individual X AU we ems ! Uh ' '1 2. _ e185 «we mm 3120 0 ma 21) A compound has the following percentage composition by mass: 33.88% copper, 14.94% nitrogen, and 51.18% oxygen. Determine the empirical formula of the compound. g a I 533 .4 22) Bismuth is a solid heavy metal at room temperature. Its normal boiling point is 1564 °C. Its normal melting point is 271 °C. The triple-point is roughly 0.6 atm and 280 C. The critical point for bismuth was not measured. The density of the solid form is 9.78 g/cmgfindwthe ensity of the liquid form is 10.05 g/cm3. Roughly sketch aphase diagram for bismut Ig labeling t important areas. " 'f it _, From our dia am. (9 rvét y g“ .. " ; ~—w Which phases are likely to be stable as $5 " " I; #ggggji-jtg you change temperature 4/ ' 4” g ' ’ when the pressure is 0.5 atm? ‘ @239 see age 55% j 3 lé’ Based on their properties. Draw a simple picture of bismuth as a liquid and a solid in the boxes to the right. we 2 ~£= 2 of i a)” 24) Two balloons at Standard Temperature and Pressure are filled with l g of Ne (.M. = IOg/mol) in Balloon A and 1 g of He (M = 2g/mol) in Balloon B. A) In w h balloon do the particles have an average higher kinetic energy. Explain. @z/ = \ J i - r . fl . W . u, ~ A' x .m’ w) 1/13 Te K6 A ? “(4” $5 i” B) In which balloon are the particles moving at a faster speed. Explain. _ A“ W” 3" a a 2“ ® (J 5 séfiifgfiz 536i» @asamw 3 " e if :3! '3 a e“ ' ' ' “ ' ” .J . . . 55; V :2; é ,. C) In which balloon do we have a smaller number of particles? Explain. 3.5% W": Ciel?“ M ~ ,. gfizAasal £3 (is? mag 5 hl‘éwpe > W11 4 3/ a ~ as; ea fire—2M» W2 3 ~05 fUU D) Which balloon has the larger volume? Explain. X J“ « m " mus“ waldo #‘Z/ am...) '(Vl/zzmiér 71W>77Nfi Wolf/é “my Fmfi V t n 21% W457 @‘Emww E) Balloons collapse because of tiny holes in the rubber. Ifboth He and Ne can easily pass through the holes (filtering) which balloon will collapse first? Explain “figMW/U “07— 6’7 wag am La-aaaes J h S o as. a???) 72%: ...
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This note was uploaded on 06/12/2008 for the course CHEM 151 taught by Professor Staff during the Spring '08 term at Arizona.

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Exam 1 Test Form A - apt am[my 1 At room temperature and...

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