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Test 1 Key - Form B

Test 1 Key - Form B - gfigflw W57& 1 At room...

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Unformatted text preview: gfigflw W57 & @ 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 fiirther 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 40.6 amu. A 40.0 g sample of argon gas then contains A) I atom B) 40 atoms @6ozx1023 atoms D) 2.41x1025 atoms 4) What is the mass of one mole of Ca(0H)g ? (Ca= 40. O = 16 H =11) g/mol) A) 57g B) 114g @74g D) 58 g 5) Whic . 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? O®O 00 on Q “ o0 0” o 0* 00 @ (a) 7) The circle on the left shows a magnified view of a very small portion of liquid water in a ciosed container. What WOUid the Evaporated Water magnified View show after the water evaporates? g l XE? /_»----.K\ ’/:x\ ”H g I" c K r 3'; m *’ *3) I C o l ( .. w u .; we . m WM 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 found 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 A) gold 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 on the final dens' ? v “y 1) e: ”“44... ”12(7th 50 '0 whey-«(L A) higher @ C) no effect since the necklace weighs a lot more than air. 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 particles®3istillatiom boiling point (volatility) C) Extraction, solubility D) C omatography, attraction between materials @ What measurement would be best for the insect? a. t in b. 1.5 in ‘1 lat d. 1.52 m e. none of the above / L {<6 %Q%f: €914“ng [(53 5 79 / / \\ 12) Two substances are at the same temperature. A molecule of substance A is mass 4 amu and a moiecule of substance B is mass 12 amu. Ifthe average speed of A is 100 m/sec what is the/ average speed of B in m/sec? 4. (lath-L : 12. V; Vii): A) 100 B) 173 C)33.3 D) y/i E) 300 57.7 /* 5/49/24,“, 515/: '% 13) The empirical formula for a substance is found to be CH30. The formula weight of the 5 I substance is found to be 93 amu. What is the molchlar formula? (c w A) CH30 B) czflgo2 C) C3H30 D)C3H90 w 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 fieezing C boiling then condensing (7, @ ublimation then condensing A gag/@592? “T easem— safe/7‘s we?!” r)” u? 0 0 «(a 0pc/ 15) When liquid water at G C freezes the temperature stays at 0 C during the entire process. Why? A) The kinetic energy is dropping. While water fieezes it absorbs the coid from the surroundings ‘le water freezes it releases energy to the surroundings Th e temperature of water goes down, but not the ice. 16. 2 points -- Row many significant figures are there in the following numbers: 0.01 ; 1001.0 ; 0.000020? A) 1,5,2 B) 1,4,2 C) 2,4,6 D) 2,1,6 Free Form Answers. DO NOT mark anything for these on the Scantron. The TA’s will grade and give you full or partial credit. Only your work here will be graded. Show all work for any partial credit. 17X 5 ntsone for each row) Fill in the blanks Name Formaul T ine ionic or molecular LtTmcofl 13on Lil ,7 _. —E—maa cm» mm Lam—— WW owe theme 18) (lOpts)Complete the following table:— QaN/‘F W 0g 6A3 3?] 1* Compound Mel Mass Grains Moles Molecules (given) as Individual X A 0‘3 54 Q ‘oms I H ' 1 '1' 2' 32.1glmol 9.25 :2 I 0,183 l .7?x fl; [-O8X(¢, . i” Atoms Ni 53.7 g/mol 3 l 20 S 5. ( 3.20 x 1025 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. a... 91721-322 1 0,5221 ’ ewe geese: mi W [é' a? 44 "i 0 ‘g/ 1);)? O 1 2 -- 04152.; M 1-31 317:3 2—47 6‘01 N 22»: $200 ramble/fl 0&0; - .11 521 [sage/>1 s 6 1533 ‘ 4'9» MWEL >2) \ - i l I 22) Bismuthisasoiid heavy metalat room temperature. Its normal boiling point is 1564 °C. Its normal melting point is 271 °C. The triple—point 1s roughly 0.6 atm and 280 C. The critical point for bismuth was not measured. The density of the solid form 15 9 78 g/omifind thedensity of the liquid form IS 10 05 g/omfl”. Roughly sketch 3 phase diagram for bismut labelmg t important fl gfldfs/e‘ f3" 1.32;: ,-' 1. From our dia am. 2 'vét y gr you change temperature when the pressure is 0 5 atm? 1 £1.12 .‘2 5% '77; W13) 5s as 2w 61 MSW ’1’ C) / Based on their properties raw a simple picture of bismuth as a liquid and a solid in the boxes to the right ”1* 21 11; era/159' "122W Degas/1e fiffigfl‘xfi $635141; ii) use .1 1. Which phases are likely to be stable as % 0 24) Two balloons at Standard Temperature and Pressure are filled with 1 g of Ne (M = 10g/mol) in Balloon A and l g of He (M = Zg/mol) in Balloon B. A) Inw h balloon do the particles have an average higher kinetic (energy Explain 25sec” \ :b/I/n ’ fly? "KgA #5 £73 627 ‘ ,. B) In which balloon are the particles moving at a faster Speed. Explain. @ .. .5 E, _ firearm) 89k 3‘“ s5“ “4/ 1w? U2” 55 Ale; as swag first! 5‘ iii/d» if C) In which balloon do we have a smaller number of particles? Explain 5(1) Viki; gig; Wt x2 a: w w ha> ma 4 > g 54:: few Wax/23 My has; 13a" meat/ix PM, was?) D) Which balloon has the larger volume? Explain. ,Wm 12.7“" '71 44> [KNEE mix/«é O V n 11% mama 1%!va (5 E) Balloons collapse because of tiny holes in the rubber. If both He and Ne can easily pass through the holes (filtering) which balloon will collapse first? Explain ‘ , IQ" “771M403" Z3? ”07— % was“ arm was», $63“ find?) w/Qazst-‘T xii/3455335 a?“ . g COMO IV/"f Q Xfl/ Tamarfias/é [‘85 a; 31“ 43693?ng Was: («am/5 69?" 1‘? 33339313 ...
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