CHEM_1000_Quiz_2_Solutions

CHEM_1000_Quiz_2_Solutions - General Chemistry CHEM 1000...

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Unformatted text preview: General Chemistry CHEM 1000 Student ID: Student Name: 2,. SECOND TEST CHEM 1000 JUNE 15, 2011 DURATION: 50 MINUTES Aid allowed: non—programmable calculators. Answer all questions in the space provided on the examination paper. Please read each question carefully and answer only what is asked in each question. Neat writing is highly appreciated. Read each question carefully before answering. All answers must be in ink. This test has 6 pages Total Marks are 30 Question 1inch=2.54 cm 16’m"=1mL, k= 1.38066x10' JK‘l 12inch=1ft llb=453.59g 1.6km=1mile; RH=2.18x10'”‘J 1Cal = lkcal = 4.184 kJ; Ax.Ap Zh/47E ; lnm = 109111; Kinetic Energy (KE)=1/2mv2 Avogadro’s number (NA) = 602214199 x 1023 molecules mol'l 0°C = 273.15K; 1L.atm = 101.3sz ; e mass = 9.11 x 10'3‘kg Specific heat of water = 4.184 J g'1 °C'1 1 J = 1kg/m2.52 C: 2.998 x 108 ms'1 h: 6.626 x 10'34 J.s = 6.26 x 10‘3" kg.mzs'1 1.0 inch = 2.54 cm Hz = cycles/s = s" - AB = RH[l/ni2-1/nf2] Q. 1 .a) A reaction inside a cylindrical container with a movable piston causes the volume to change from 12.0 L to 18.0 L while the pressure outside the container remains constant at 0.975 atm. What is the value in 'oules of the work w done during the reaction? [4] The volume of cylinder is V=1t h, where h is the height. AV - \QDL» lfi‘OL : 93L to». » PM : aO'q’iS‘OJV/MAX 6‘OL‘ : \vx We): , 57 83'- L‘ Click M a‘ M .23” 3 sgsL‘ii “0‘3 flit”... : S‘lz‘fij z 5925 b) The diameter of the piston is 17.0 cm. How far does the piston move? [3] 7 ’?> V; é‘OL X [bDOWLX [cm : 6060 CMS l L__ l WL. «— l” \ V 2 H Y h u - [q 3 V W v L p @600 cwg h ’ 'TI‘ Maswl?” £64 CM M Q.2.a) A 28g (1 oz) serving of a popular breakfast cereal served with 120 mL of skim milk provides 8 g protein, 26 g carbohydrates, and 2 g fat. Using the average fuel values of these substances, estimate the fuel value (caloric content) of this sewing. [4] 2': 431; 14$ KM , éSZf’CJ/X L534; : 693 14%” egg/(913064 b) A person of average weight uses about 100 Cal/mi when running or jogging. How many servings of this cereal provide the fuel value requirements to run 9.6 km? [3] Ho 1cm We «74752,ng ., 3% x My) x re. 3 3, g; / m“ 5% Cat AA? A! 5&YV%‘ 3 Q.3.a) Styrene (CgHg), the precursor of polystyrene polymers, has a standard heat of combustion of —4395{7mol. Write a balanced equation for the combustion reaction, and calculate AH°f for styrene in kJ/mol. [5] AH°f[C02(g)] = -3935 kJ/mol AH°f [H20(l)] = —285.8 kJ/mol CgHg +iDO M g Q7163 +LleDW) Z (El) EMF-5935’ + 402655)]- [6 43%“ l1 lo 53 04 “J S g g wt "’ ‘ $34 b) An electron moving near an atomic nucleus has a speed of 6xlO6 m/s i 1%. What is the uncertainty in its position? [4] km Yaw Li» J Au . Au :l/.‘;fu;o.ol><<éxlo 3 s U AP; MAM W Ceyfqédq 1:“. éxwvat/t if; ; AX 13“ g “77' h > [HTWAU‘ >/ A424 XISM‘QJL“: I T W ’ 4T!“ (ii/xlé'yka) (Ln/04:; Z IX ’0 M Q.4.a) A hydrogen atom absorbs a photon ofvisible light and its electron enters the n=4 energy level. Calculate (1‘) the change in energy of the atom and (ii) the wavelength (in mm) of thephoton. [4] 1 _ J/ 5;) Axes —RH 22;» mg) 4%, l \ ”§ (W, ,L :~Zl€xx0.t "2‘8X(04 M, Lt ~I 3 Ca) AE $14)) : ’19. /\ W34 3 ,\ , h; ’ (@1414;on $5) Mamie”;— ' AE ’ , - l ' 4.0% x {emf -—7 5 x /0 on V7 IMAM MW : 4 lo m X "’1'" * 1+ Z X bat/M b) A Nitrogen gas laser pulse with a wavelength of 337 nm contains 3.83 ml of energy. How many photons does it contain? Ci [3] >\ ; 3‘3? mm X [D V“ : B‘B'fiszE’fiu [WW -3 Em : 4.1., : (9mm hamwieg /\ '53} x (530% 3 : S“ EVSXISWI ; Sggxigbd (NJ ,1 “Zr” / szgfm; EPMSt : E‘QZX/a J _ {0’5 Ewan“ f‘g‘ifxzé'mj ’ X “)3 C‘QDX/O/f/MWS- 5 ...
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