E1(evening)KEY - Key to exam 1(6:00 PM section The key...

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Unformatted text preview: Key to exam 1 (6:00 PM section) The key provided is for form J of the exam. Forms K and L are scrambled versions of this exam form. You should find it fairly easy to compare your version to this key. You are strongly encouraged to spend time going through the written solutions. In doing so, you should enhance your understanding of the material as we move on to the second chance exam. Each question is worth 4 points. Choose the BEST answer for each question. 1. Radium is a metal/metalloid/nonmetal and has the symbol Ea. . a. metal, Rn Q metal, Ra c. metal.oid, Rn d. nonrretal, Ra 6' nglfsn A5 M 2. The elements tin, arsenic, and astatine are represented respectively by the symbols: Au, 8:), At, Ar b. Ag, Ti, As, At c. Au, 8:), At, As Q Ag, 8’1, As, At e. Au, 8’1, Ar, As 3. Which pair (element name and symbol) is incorrectly matched or contains an error of some kind? a. hafnium, Hf b. rhodium, Rh 0!. c. plutonium, Pu d. a and b none of the above 4. The number 6.4246 X 102 should be correctly rounded to what value in order to have exactly 3 significant figures? 6.—-2 6W mm x /o"" 6—20 x 102 T 642.0 [(55 44M 5... 50 MI) 6.—-2 >< 102 5. Which would be chemically similar to elemental beryllium? m 3' Kb M 244 b. '—Ie c. _ ' a e. 3 6. In terms of atomic structure, the common characteristic of elements in the same group is: a. they are isoelectronic Q they have the same number of valence electrons c. the number of neutrons for each element in the group is the same d. the number of protons increases by one when moving W was: a. M31 . e. they are all isotopes of each other 7. How many nonmetal atoms are there in the formula: NaHzPO4? 1::- a- 1 2 In] Mimi 13' i I f’ M'M c. d. 6 ll "‘7 “'4”; 7 8. Which of the following is a chemical property (or change)? a alcohol freezing b. mixing vegetable oil and water c. a sample of methane gas is compressed d. seawater drying up to leave a residue of salt "l l“ combining sodium metal and water produces hydrogen gas 0’ .J r M 9. Which metal will combine with bromine to form a 1:1 ionic compound? m H a. carbon 4,,in 4.1M? potassium K8, “’5‘ 6”}14WII “M. c. magnesium d. nitrogen ‘3‘) ”ante e. aluminum 10. Which pair (group and valence shell electron configuration) contains an'nerrorP a. noble gas, ns2np6 b. akaline earth metal, ns2 oup 4A, nsan2 ._ g $- halogen, np5 ”‘zflf e. a_l<:ali me tal, ns1 11. The speed of .ight is 3. 0 X 108 m/s. How far will a beam oflight travel in 1. 0 us? 3.0><_02m lex‘la-i” b. 3.0><_08m -5 c. 3.0><_017m (3.050051%! 10 5 =3 300m d. 3.0 X _ 0’1 m z- 3 at lo M e. 3.0 X _ 014 m 12. Compute the ’lLlIIleI of atoms in a 10.0 g sample of aluminum. 2. 23 X 1023 atoms 25 mm 1 ’7'" W b_ 6.15 >< 10 atoms (/0. OJ Ml. “out/52‘ sz MD; c 1 62 x 1026 atoms 26.? Kant“ d. 4.48 X 10—22 atoms / If ‘ ‘H e. 2.23 X 1021 atoms wlhavaume, 13. An atom has a charge of +2 and 36 electrons. What is the atom? :- yttrium 39 P 3 6 e" bromine ;- gig; L, Mama ,2 5r strontium 14. Convert 5.235 X 103 micrograms into milligrams. a. 5.235 X 106 mg b. 5.235x 104: mg C {3/03 X:% c 5.235 X 1012 mg 5 ZS {9 /d 5?} 5.235 mg e. 5.235 X 102mg 1%“? 5 “so 15. An isotope with a mass number of 59 with 28 protons in its nucleus will have 1 neutrons. a. 14 f b 28 57-23“ 3/!) P'f‘n 5:? 2: e. 87 16. Convert 2500 mm to miles (Note: 1 ft. : 30.48 cm 1 mile : 5280 ft.) a. 0.16 miles I ”11¢ é 1.: >< 110—331-1652 fwd?" 3;ng 52.80% d. 1.6 >< 10-6 miles /_ c g ’0‘" gw'f‘; e. 2.3 X 10—7 miles 17. About how many bromine atoms are in a sample that has a mass of 7200 amu? a. atoms W A" }LL :2th my 4.»: 80m ”‘14:; c. 180 atoms 7200 a ?o ”I 5 cl. 200 atoms 30 e. 5.8 X 105 atoms 18. How much heat (in kcal) is released when 125 g of water cools from 900°C to 95°C? (Note: the s ecific heat value for water is 1.0 cal/ -OC.) “ : 0.644kcal 3):. ”‘0,ng k-) 5T” 80-506 b. 1. 55 kcal c. 12.519231 3’“ (Izfl‘S-Tfi l-l’ 3X50 5 C)= #2062 3'01 NJ ken-Q. 19. 20. 21. 22. 23. 24. d. 2.44 kcal G 10.1 kcal How many significant figures are in the result when you add the following together? 44.505 g + 400. g + 5 X 10—2g U'l—IlUJMH Which represents a valid, prop rly written ound state electron configuration? a. an 25 u 2p 11 [email protected] :Qozl/o ® 1s H 2s T_1« 2p T__ c. 1s E 2s® [email protected] _ 3s 8:0A/0 d. nu zsfi 2p fifi@ 3s_tl’0 e. none of the above Which measurement represents the largest amount of matter? 60an '40 WS’ ”M. -L a. 4730 ng uni. (‘73 Ifa j t , b. 4.73 X 104g 3 fink’ ’93”:— c. 473 >< 105 0g .4, 9,73 5!)! j 5 —-.73 x 10—41:g “.5 9:73 xifl‘ffy‘ It’s” )0?! 4,4; "7-3 mg ---> «I. 73 21'0“?) Suppose a neuga atom ofchromium contains 29 neutrons. How many electrons are present? a.- 12 §WL£ 24%;? “A. 2.4: 24 c... an... mm c 25 d. 29 none of the above A 100.0 g sample of tin required 394 calories to raise its temperature from 245°C to 100.00C. What is Vac” are: 75.5%.. the specific heat of this metal? a. 0.0394 cal/g-OC 0.0522 cal/g-OC C x: .3 ... M c. 0.161 cal/g-OC “AT "0”?)(75m) d 5.22 cal/g-OC e 19.2 cal/g-OC (:5 6' OS'ZZCJ/j 'C, Which of the following is equivalent to 0. 008000? 25. 26. 27. 28. 29. ET '93 C. (E) E. 8.000 x 103 8.000 X 104 8.000 X 10—2 8.000 x 10—3 8.000 X 10—4 The melting point of a compound is —l39OC and it becomes a gas when its temperature is above its boiling point of—32OC. At which temperature would it exist as a liquid? a. b. C. E. 3505 3gp :3 we. “P b? 00c ) 544$ ——‘I"“-"—-—I—‘ -:'s‘i'c. 432°C... T —1000C —2000C 51:1” MI", ”0". - 1“ (2-43” —100C Osmium is the most dense element with a density of 22.5 g/cm3. \What is the approximate mass in grams of 10.0 cm3 of osmium? 9‘!“ C. Q E. 0.444 g 2.25 g (laboux 22"51—3 ‘5 2.29 22.5 g cm’ 225 g 444 g What is the subatomic particle that has a positive charge and a mass of approximately 1 amu? M b. d. E. W nucleus W I!” 3'5"?” ‘9’“ la. Put the following in order of increasing energy. E. I: 4d orbital II: 5p orbital III: 4p orbital IV: 5s orbital IV < I < H < III IV<H<I<IH I; zszf3$3f753qu$$ quCS-HH ‘ I<1v<1u<11 /fi[ III<Iv<r<rI fl III<II<I<IV ll. Imaginary element Xx has two naturally occurring isotopes, Xxeé and Xx47. Given that the abundance of Xxeé is 92.5%. what is the approximate atomic weight of this element? (Although a calculation is possible, you should be able to determine the answer with a simple estimation.) 0 fl 03$?) 44M any“?! 6.§Mu. 6.08 arnu b. 6.48amu M} 7% AMM- mar/'9 (V152) )(atflé c. 6.50 arnu .0 .f aui-ALgc-{cxg'k‘oo cl. 6.94 arnu W e. 12.5 arnu 30. Which of the following is equivalent to the volurne of a cube that is 10 crn on each side? Not.he volume of a cube is length >< Width X height. Q 1L V 3 QOMX/flMX/OW) b. 1c; 3 c. 1d; u:- /000 0’7 [1' iii uni/3’» a; Mme 0" ’1’ 31. Which of the following contains exactly 50 neutrons? a. z§V b. di -50 .. I C. SC:‘U:_—._9 MW” #ffiJ‘u-J “0'4““. cl. magnesium-25 21—90 90 5/94!) 3r :2 ”(wad 5‘ ”‘3 {a 410/9. 32. The 451 orbitals can collectively hol a maximum of a. 2 electrons. e, . b. 5 electrons. 6 electrons. & L/gé, (g {Og/‘Mué W’Z- 10 electrons. #1,! ’2‘,ng ’(fl‘yu. e. 20 electrons. 33. Which is the correct ground sta te electron configuration for a neutral telluriurn atorn? 1322322p63323p6 s23d10 p6532 ld105p4 “”5 S Ze, b. lszgszgpégszgpé s23d10 p65325p4 C_ [Ar]4s23d104p65s24d105 2 k“ “25’3” (’1 “9 “’7 {M V24: cl. [K_]Ss4——d13(p4 5Pq e_ [K_]%4__d1 p4 34. How rnany vale’rce electrons does a neutral atom ofphosEhorus have? @: mfflég-va‘a. c. 7 d. 8 e. 15 35. A neutral ele 'nent contains 54 protons and 80 neutrons. It is: “" I g I 4 Xe—134 Y b. Fe—5—- 4:41:95 9/ 440 €— c. Al—27 d. Zr—9— e. Hg780 36. Which electron configuration is an excited state ofa potassium ion (KW? W M ‘ 3- e 3s23 5 l7 . W Z situat— d am x3e, mag/Ma [Ne] s p s I'flV‘k 09/ A? C. 1s22322p63323p6. s14p1 30¢.- bu d- 16822822p63323p "Sl- ’7‘ e. 1522522p63523pyk WM 37. The density of a liquid is 1.29 g/mL. What is the volume of 18.20 g ofthis liquid? Make sure you have the correct number ofsignificant figures in your answerl a. 7.08 x 10‘2 mL 14.1mL L’s}; wa [ML a: It}. 10851-01, c. 14.11mL 3-, d. 23.5mL . e. 23.48mL “’7 3 If; 14;: ¢//W¢£ 38. Which factor would let you convert hectoliters (hL) to kiloliters (kL)? Note: the metric prefix hecto— means 102 t; m 5 I a JM#;(¢; a. mum; 7.. b. 10-2kL/hL /IIL 3 ’0 L‘ c. iozkt/h; [hair = IOSL _ .- I d. 101 kL/h__, [kg ’02, IOA kl, 10—1 kL/l’i 39. Which is an alkali metal? ’0 :1). radiurn'.‘E W lg titanium radon C. d. rubidium K L 40. Which is higher in energy than green light? . E Ikarmz}: a. blue light b. ultraviolet radiation (3. orange light A; ”at; aandb 1R Rdféfill/ e. none of the above T .74“?! ...
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