E1(morning)KEY - Key to exam 1(9:00 AM section The key...

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Unformatted text preview: Key to exam 1 (9:00 AM section) The key provided is for form A of the exam. Forms B-G 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. Radon is a metal/metalloid/nonmetal and has the symbol a. a. metal, Rn b. metal, '{a c. metal.oid, Rn d. nonrretal, Ra nonrretal, Rn 2. The elements g d, an ‘ ny, ast ' e, and ar nic are represented respectively by the symbols: fiat RL‘) it? A? a. Au, 8:), At, Ar b. Ag, Ti, As, At 0 Au, 8:), At, As d. Au, 8’1, At, As e. Ag, At, As, Ar 3. Which pair (element name and symbol) is incorrectly matched or contains an error of some kind? a. hafnium, Hf b. rhenium, Re /Pl¢‘l1. M Q plutonium, Pt :1. a and b e. all of the above 4. The number 6.4286 X 103 should be correctly rounded to what value in order to have exactly 3 significant figures? 3 : 2-4310, nggé 5* /0 d :20 75‘»- longer 6.43><103 C‘LSX/OB 5. Which would be chemically similar to elemental barium. W b-. <1 L) Smé W c Cs d '{b e. _'_,a 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 moymg-daianghfimgmm amass mp4"!- e. they are all isotopes of each other 7. How many nonmetal atoms are there in the formula ofpotassium bisulfate, KHSO4? a. 1 ll-IaJ-vm b. E. 8. Which of the following is a chemical property (or change)? alcohol freezing mixing vegetable oil and water a sample of methane gas is compressed @951???) combining sodium metal and water produces hydrogen gas M a, a Q If 9. Which metal will combine with chlorine to form a 1:1 ionic compound? Violm'!‘ {34“. a. carbon @ cesium CSCI c calcium @g 1,1499% r ‘ “.617 seawater drying up to leave a residue of salt ”flé‘ fiII‘J r d... nitrogen fl'é ,' a], 3!“. “1‘6 [0 5‘03 e. aluminum a) ”I a2 10. Which pair (group and valence shell electron configuration) contains an error? noble gas, ns2np6 akaline earth metal, ns2 g cup W344 2257-»; 2’ halogen, ns2np5 a.kali me tal, ns1 a. b. d. e 11. The speed of .ight is 3.0 X 108 m/s. How far will a beam oflight travel in 1.0 Ms? Q 3.0x .02m \-’> / b. 3.0 X .08 m 9 «J! x / /0 m == 0 c. 3.0 X .017m (3'0 ’0 I” f 3 0’" d. 3.0>< .0’1m 32/02, e. 3.0 X .014m 12. Compute the ’lLlIIleI of atoms in a 10.0 g sample of aluminum. ~13 9 {ea 2.23 X 1023 atoms I 6.15 x 10-25 atoms (lag flxwfiéqxfiifl” I. “061/0 c 1.62 X 1026 atoms d. 4.48 X 10—22 atoms / ¢ ”‘55 MVM/fl “J“; W 2‘9 3am“ 8:2?” fl M e. 2.23 X 1021 atoms MM Lut— mm: P W e... 13. An atom has a charge ogg‘fii electrons. What is the atom? scandium I?P /g& b. chlorine c. argon {9* lg“ cl. krypton a“, . potassium K ’2 Ma, RWLQ' I? “'5 I?’o 14. Convert 5. 235 X 103 micrograms into milligrams. 5235 >< 106mg 5.235X10—6mg L5 zggx/D;}XX:ZJX/1)‘lo 5235913 5. 235 X 1012 mg 5. 235 mg 5235 x 102mg 9‘1" 0‘93 15. An isotope with a mass number of 59 with 28 protons in its nucleus will have neutrons. Z” :2 7‘ ’t (3; a. r” “P 1. 59 sci- 29-:- 32 e. 87 16. Convert 2500 mm to miles (Note: 1 ft. : 30.48 cm, 1 mile : 5280 ft.) a. 0.16 miles b 1.4miles (a: 66’ “fix-fid' “Km” lfi I Wit . .5: 30.430" saga-H- @ 1. 6 x 10—5111 :1. 1.6 >< 10-6 miles I L g ,0'3W‘é; e. 2.3 X 10—7 miles 17. About how many bromine atoms are in a sample that has a mass of 7200 amu? W 35 atoms 1 61’ “film 5 80% "A?” [WELL ME 90 atoms c. 180 atoms 290 cl. 200 atoms 80 e. 5.8 X 105 atoms 18. How much heat (in kcal) is released when 125 g of water cools from 900°C to 95C? (Note: the specific heat value for water is 1.0 cal/gr-OC.) S O a. 0.644 kcal 5-, mch 51— "" 89.5- C b. 1. 55 kcal ? c. 12.5kca1 “(’25 A}; 3’0 5 C #9062 £01 3’ fl? 5X )5 m I kafl d. 2.44 kcal 10.1 kcal 19. 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 20. Which represents a valid, properly written, Wm electron configuration? a. is n 25 u 2p N N 3162/0» @ 1s H 2s Ll 2p T T T 3s c. 1s E [email protected] [email protected] _ _ 3s _/d0 d. 1sfl zsfi 2pfi’l_¢@33_flp e. none of the above . Ma...” 49 4' M" 21. Wl'uch measurement represents the largeit amount of matter? Cd ‘ a. 4730 ng “-5 4.7331? 3 fl 4 . my“! b. 4.73 X 104g .1 c. 4.73 x1050ge—5 9.73 and"; 0‘ Q —-.73 x 1041:?) 473 zla"j¥' /"5 ° / %‘ ck. e. —-7.3 mg-------) (1'. 73 K [0' 2-, 22. Suppose a neutral atom gfi manganese contains 29 neutrons. How many electrons are present? a' 12 9/)?” 4.1.4471 it; 24$}: . 25-43. 513'“?- b. 24 ¢ 0 25 ”W cl. 29 e. none of the above 23. A 100.0 g sample of tin required 394 calories to raise its temperature from 24.50C to 100.00C. What is the s ecific heat of this metal? ,. p r 1"ch b7“;- 7;.S'oa_ a 0.0394 cal/g-OC Q 0.0522 cal/g-OC C "3 3"" c. 0.161 cal/g-OC m AT 0W) :1. 5.22 (:21 /g-Oc e. 19.2 cal/g-OC a; a, OSZZCG-e/J at 24. Which of the following is equivalent to 0.000500? 5.00 X 105 b. 5.00 >< 104 c. 5.00 X 10—2 d. 5.00 X 10—3 5.00 X 10—4 25. 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? m b? b. 0°C 5 e c O "“ IEQ'C— “'3?- Cr ' “M 1‘ _1000c g e. —200°C .951” My” ’nf' - ma C- I! W‘ mp amt-[91p 26. Osmium is the most dense element with a density of 22. 5 g/cm3.\What1s the approxunate mass grams of 10. 0 cm3 of osmium? a. 0.444 g b. 2.25 g (/0 .ocmzz'z' g3>w2 43.!!! c. 22.5 g a 225 g e. 444 g 27. What is the subatomic particle that has a positive charge and a mass of approximately 1 amu? proton =3: w b. neutron 3M :1. prowl-UN na+ a (“lain/2- P4243“ J I] e. nucleus {p I 1%) 28. Put the following in order of increasing energy. I: 3d orbital II: 4 s orbital III: 4 p orbitalIV: 3 p orbital a. IV<I<H<III Q Iv<rr<r<rrr IIZSngfgf #:3314999; 5,6 M... c. r<rv<rrr<rr d. Irr<rv<r<rr /// \ l? 11' I it e. III<II<I<IV 29. Imaginary element Xx has two naturally occurring isotopes, Xxeé and Xx77. Given that the abundance of Xxeé is 7.5%, 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.) 30. 31. 32. 33. 34. Whi 6.09 amu 6.50 amu MMA MIT?! Xx“? J {a (jyam. 6.52 amu 6.94 amu ( 9L5?» 1'1‘7 12.5amu 7v§70 2""L ch of the o owmg is equivalent to the volume ofa cube that is 10 cm on each side? Noél‘he volume of a cube is length >< Width X height. ”i u-— QOcmX/amX/O a») l c__, 1.1;- u;- ,mo 09:3 ML “4,11,, ,3, Noam of Which of the following contains exactly 50 neutrons? ”V 33%. scandium-SO 395‘ ”kiln?“ # {I "W3 #4) J 50 Sn M a“ *h :0 I erg: magnesium-25 I3” zago. 3 2r ,3 «.45 gas-940’. 1914535390459 04. A dorbital can hold a maximum of H El. c. d. e l elec on. a. 2 elec:ons. #dny {fig/C. QKL’J‘Z 191A ”14.1 t; Z 8. .! 5 electrons. 6 electrons. 10 electrons. Which is the correct ground sta te electron configuration for a neutral tellurium atom? C9 b. E. w ls22s22p63s23p6 s23d10 p65s2ld105p4 m‘ 52¢, 1 22 22 63 23 6 23d10 65 25 4 h s s p s p s p 3 Pg “£3 QLJOJVMSJQKL, 41;;wa [Ar]4s23d104p65s24d105p2 q [K_]53d —— d%4 \' 5', [K-fiL-daéfi How many vale’rce electrons does a neutral atom of sulfur have? M 2 f4!) 4 5'0 flew/94:1 “2252.3913‘ 364/136 K alpaca-{AW 6 e. 35. 36. 37'. 38. 39. b. c. d. fl/sowfmf if. 8 16 A neutral ele 'nent contains 54 protons and 80 neutrons. It is: W Xe—l34 -/ 96-5-. L; Avg“; é/W aw Ye. Al—27 Zr—9— ngSO e. Which electron confi ation is an excited state ofa otassiurn ion K+ .9 gUI W P “+2.” @951???) W [Newsaps 17¢. . we. [Ne]3s23p6 3490.01 {Me lie, {505/ ls22s22p63s23p6fis14p1 2.0 e, 1s22s22pé3s23p6—s1 [9‘ 1522522p63523p5451 ’3‘ My!“ MM” 110'; 1:1 lwd’xazk MAM. 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 d. E. 7.08x10-2mL / ML- 14.1mL (/3201 $3? 3 [$103me 14.11mL J 23.5 mL 0,317 3,93 '8 HM 23.48mL {Ii [ML Which facto: WOle let you convert kiloliters (liL) to hectoliters (11L)? . i _ 2 ‘ 0 Note. the metric prefix hecto means 10 a mwg ’i Max‘s a. 10—6 ’1' /l<' 2. b. 10—2” ' /k' [03L IO L, c. 1021” ' /k' kl, kb '0 1011” ' /k' 3 e. 10-1pL/k; L} [L X [0 g g: /0/5L Which is an alkaline earth metal? ’02- Kt” k L' radii. 11k ham mg 7”"? 2'4 radoc Rf; scanc'um $4, rubid'urn & b 40. Which is higher in energy than red light? a. blue light ‘ § b. orange light E If!” A25 (3. infrared radiation E aandb * #- e. alloftheabove 1g R a «’2 5'5 ) 1/ DUI rile...
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