{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

GA Chem2A - Practice Midterm 1 (Key)

GA Chem2A - Practice Midterm 1 (Key) - Chemisuy 2A\e mew...

Info iconThis preview shows pages 1–10. Sign up to view the full content.

View Full Document Right Arrow Icon
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 2
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 4
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 6
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 8
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 10
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Chemisuy 2A \e mew NAME KEY First Exam , rm . La, TA. 3 \ M HD\\\§\L Lab Section Number- FRU ’ Lab Room CLOSED BOOK EXAM - No books or notes allowed. All WQrk m as! 12g shawl: glgarly MM 2, 3, and 4 for credit. Place all answers in the space provided If you require - additional space, use the back of the exam. Be sure to write your name, your T.A.‘s name and your Lab-Section Number in the space provided. Be sure your exam has 4 questions on 9 pages. ND: (9.0111013 Es. M g$ :E 2b.°t% MM N103: ‘D\-q\a MM COCQDY‘L: VAR-3% MM Nd?» =\DZ.‘B°\ MM ‘9. v- c: \‘B'Ifb - \~I\ M \ “but $58.5“: ‘MM ‘szcaovt =‘ \\o\o.‘\ NM COL c “\‘-\..D\ N“ \Aszt = “1.0% MM Walk :3. 8% PM 2 3 l. (60 pts) For parts i-xii circle the correct answer. No partial credit will be given. (i) When the calculation 3% H 9) x WWW (ii) (iii) 35.43 x 4.640 + 0.21 \ P m . <1 its-t9) is carried out, the number of significant fi es in the answer is (a) 2 .4 ‘ (c) 3 (d) 5 (e) 6 A millisecond and microsecond are (a) 10‘3 s and 10'9 s, respectively (b) I‘VIO'2 s and 10'6 s, respectively . (c) 10'1 s and 10‘6 s, respectively ((1) 10‘3 s and 10‘4 s, respectively 103 s and 106 s, respectively August with a fever has a temperature of IBWF. In degrees Celcius, the temperature is (a) 155°C (b) 720°C @ 57.8°C Q , ((1) 400°C (e) 169°C (iv) An isotope of technetium has an atomic number of 43 and a mass number of 99. The number of electrons, protons and neutrons, respectively, in this atom is (a) 43, 99, 33 & 9 °\ (b) 43,43,99 .4; q 5 @ 43, 43,56 N: 5 \o (d) 43, 56,43 Q— ”-93 l; :qg, thb (e) 56, 43, 43 (V) A catalytic converter promotes the reaction of the pollutants C0(g) and NO(g) to give C02(g) and N2(g). When a balanced equation is written for this reaction, the coefficients of CO(g) and NO(g), respectively, are (a) 2,1 ;_ C50 \~7,Nb f9 [COLA—N1, 2,2 ' (c) 1,2 (d) 4,1 (e) 3, 1 (vi) Which one of the following elements is a semimetal‘, 11mg} 0. “125a.“ DKA 7‘ (a) germanium (b) zinc (c) iodine (d) lead (e) mercury (\(ii) (viii) (iX) (X) +2. 44 v2, The systematic name for Cu2003 is coppcra) carbonate 0)) COppcr(II) carbonate (c) cupric carbonate ((1) dicupn'c carbonate (e) copperfl) uicarbonate Which of the following reactions is a redox reaction? , +1 +51 :2 “H "| 55 (a) 2KC103 (S) ———> ZKCI (S) + 302 (g) (b) Na2%03(5) —-> Na20 (S) + C02 (g) + Liv—.1 +7— ”1" *‘0 :2 (c) MgSO4 (s) —-—> Mg0 (8) + 503 (g) (d) NH3 (g) + HCl (g) ——9 NH4C1(s) (e) NazO (s) + H20 (1) ———> 2NaOH (aq) What is the oxidation state of phosphorus in phosphoric acid? +3 _ (a) +1 A“ “\3 <31 (13) +2 H.599 Li (0) +3 (d) +4 .+5 The average mass of one mercury atom is (a) 3.33x10‘22g \ : R {MAM}? (c) 3.00 x 1025 g (d) 6.02 x10‘23 g (c) 0.201 g "2,pr 2V3 \ t/ % (xi) (xii) K“: mime > Which of the following titans the most molecules? V \ m& (a) 5.0 grams of CO 1% L \m Ovrw 3 ‘ D F" (b) 5.0 grams of 02 32‘?» WW SA 3 E 'mtsx 5.0 grams of H20 3%m_§‘\ \ fr ,/ KD’L d 5.0 f c 3“ CWW%~ ” W“ 02% _ (MR3:— \ (e) 5.0 grams of C12 fioQo Consider the followin g reaction 2A1203 (1) ——> 41:1 (1) + 302 (g) 300%ng '? figd If 1.00 kg 0 (1) is produc from 3.00 kg of A1203 (1), calculate the percent . yield. (a) 37% ® 63% NS \x-wsk “2.353 MQ\ (C) 30% 3 D b \iq V 3AZ$ .3 '\ 0\ ‘ gha‘ EVA/4 ngb3 ((1) «53% i (e) 79% (10 pts) Allicin is the compound responsible for the characteristic smell of garlic. An analysis of the compound gives the following percent composition by mass: C, 44.4%; H, 6.21%; S, 39.5%; 0, 9.86%. Calculate the empirical formula of Allicin. If the molecular mass of Allicin is 162, calculate its molecular formula. C \o “\hSLD Molecular Formula Cge \)\ \ \3 gab Empirical Formula ix) The net ionic equation which corresponds to the reaction of “a sodium sulfide and lead (II) nitrate is ‘a) Na+(aq) + N0;(aq) —9 NaNO3(s) Chi) Pb+2(aq) + s-2(aq) —> PbS(s) c) 2Na+(aq) + S‘2(aq) —> NazS(s) " d) Pb+2(aq) + 2No'3‘(aq) —> Pb(N03)2(aq) e) No net ionic equation is possible a) Using the Solubility Rules, complete the following reactions. (If your professor said that she/he will provide the rules on your exam, you need not learn them completely now, but it will help you solve problems much faster if you memorize them.) b) Circle any compounds in the final equations which would be strong electrolytes in an aqueous solution. Ba<C2H302)2(aq) + -—> Baso4(s) + Na(C2H302)(aq) Balance the following redox reaction: (/gieli?” — «a +2. ‘2- ‘ *3 -7. $6 _9\_ Alg)t:_ Mn0g34___A1203(s)-:1-__3__ Mn(s)? R, =- e" (b) Give the oxidation state of: .5 Jr Manganese in MnO(_s) {’1‘ Aluminum in A12_O3(_s_) i’ 3 X? 4. (10 points) A 40.0 mg sample of compound X4010 contains 22.5 mg of oxygen toms.0 atis the at ic mass of X. Wipinkgg ~ (EX d"Q _ Z7— QVAO Ma) “0. oocb LT“ X bblSX\D\-\ “3ng 3% ' ”Sax/SWSNWD , fl. may 4. a \Q ‘ 0 C7 gawk/l6 fl \a / \\ H .o a? £33 ,9 I. Q: ER LR (15 pts) Consider the following reaction _ ’\$,Z%r “£06., ZKMnQ4 + H2504 + 5K2C204 ——) 2MnSO4 + 6K2$O4 + lOCOz + 81-120 D.bQ63bvm D,Di2°\\hm>3\ ' ”1:? a) Given, initially, 11.5 g of K2C204 and 13.2 g of KMnO4 in a sulfun'c acid solution. How many grams of C02 can be produced? (S how all work.) / \WXKLQ19\\ :2. DAjbcfi D \i C D \\>&— inDu‘ W m\§ Z 2, U} lr 8.1,?“anqu 2. U -b%€/>\~nu\3 \qubq \95 .0“ gems“ » D . b\00\\ W S klglb fim Q0 Lg gmmscoz QLDQ6C‘QD’L W b) How many grams of the reactant that is in excess (either K2C2O4 or KMnO4, ignore H28 04) will remain at the completion of the reaction? . , a \ K Na?) m §WN>§) $3731 Qfit ‘ gkmm 12. ‘13. 14. (5 pg)m%temolnity of o. solution pxcpamd by :g®bm \OV‘DQOQT w \“mm. (5 pts) How manytnLof 12.00 MHCI solution mustbedihmdtopmpm 300.0mLof 5.00MHCI solution. “can - “5.06512 Q} N) a... N “\5\ \J 2: \mmw J 300.0 ML>K$ DOM) \ Mama, I'LN OVA 8 \lSmLoSKMQ‘ L g{gsfiwrmvolumcof0.300Msto4ism1fixedtonwmfize200mLof0.500M a \JK’LSDW 3r ZN m9“ 9) ZYWD '5- 90.1.8910» O $00M D 500‘“ 15. Balance the following reactions and circle the oxidizing agent in each. Show a reasonable amount of work for partial credit. a) Cl'(aq) + Mn02(s) ----- > C12(g) + Mn+2(aq) (in acidic solutiorB lCL” . h) m1. 4-‘2eg: \ R z; + AW” +\\I\f\\jz “a W?" +zuw ‘~— «~me Mm» .‘mm M—WW —.... Mum nDz, ——) Ck MW.“ +ZMD (5? Th M WELL. .L/ W,“ HWW rm.,w.“~- Mm a. w”“ W“ b) Cu(s)+ClO3'(aq) ..... > 012(g) +Cu(OH)2(S) in basic solution Cums“ LVQO ‘6 wa‘“ L g9) Cu is, x— LVN _> CMKDML “V 2_\,\* -\— ZD\'\_ + A)“- W... . , «Wm 2V2» Cw.» *Mx-zow ~——=» deu\z >rw ZC\D§' N&VLD “—4 0.1 *W 4. )vaf ‘05 *Zcxog‘ x» who W CJLL \‘VLDW‘ N g(’ Cw (5,") "+- 2.. W.- ' -.—..____.....> wCubV\ 7‘ a +‘ ZC~LW ...
View Full Document

{[ snackBarMessage ]}