Chemistry Department. The Islamic University of Gaza. General Chemistry B.(CHEMB 1301) Time:2 hours الرقم الجامعي... اسم المدرس...

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The Islmic University of Gz Chemistry Deprtment Generl Chemistry B.(CHEMB 1301) Time:2 hours 60 اسم الطالب... الرقم الجامعي... اسم المدرس... R = 8.314 J/mol.K, or = 0.0821 L.tm/mol.

1 The Islmic University of Gz Chemistry Deprtment Generl Chemistry B.(CHEMB 1301) Time:2 hours 60 اسم الطالب... الرقم الجامعي... اسم المدرس... R = J/mol.K, or = L.tm/mol.K Q1- True ( ) or flse( X ) 1- ( ) The term use to escribe resistnce to flow of liqui is surfce tension. F 2- ( ) The entropy chnge on vporiztion (ΔS vp ) of compoun or element is lwys negtive. F 3- ( ) A rection is spontneous t ll tempertures if ΔH is negtive n ΔS is positive. T 4- ( ) In n electrolytic cell, electricl energy is converte into chemicl energy. T 5- ( ) The rte constnt of first-orer rection cn be etermine from grph of ln [A] versus t. T 6- ( ) The freezing point of the solution is lwys higher thn the freezing point of the pure solvent. F 7-( ) The solubility of gses in wter lwys ecreses with incresing temperture. T 8-( ) For the rection H 2 (g) + I 2 (g) 2HI(g), K p n K c hve the sme vlue. T 9-( ) In the rection, 2N 2 O 2N 2 + O 2, oxygen gs is forme t the sme rte s nitrogen gs. F 10-( ) For ny conjugte ci-bse pir, it is true tht K b = K K w. F Q2- Choose the correct nswer: No Answer No Answer 1

2 1- Blnce the following eqution in ciic solution n etermine the coefficient of H + n its loction (right or left sie) in the eqution. I 2 + ClO 4 IO 3 + ClO 3. 4, right b. 2, right c. 6, right. 4, left 2- Consier the following rection: Cu 2+ (q) + Zn Zn 2+ (q) + Cu Clculte emf ( E )of the cell if [Zn 2+ ] = 0.25 M n [Cu 2+ ] = 0.15 M Given: E o Zn 2+ /Zn = V, E o Cu 2+ /Cu = 0.34 V V b V c V. 0 V 3- A current of 0.80 A ws pplie to n electrolytic cell contining molten CCl 2 for 2.5 hours. Clculte the mss of cmium Metl (C = 112.4) eposite. 1F = 96,500 C g b. 8.4 g c. 4.2 g g 4- An electrochemicl cell bse on the following rection hs stnr cell voltge (E o cell) of 0.48 V. Sn(s) + Cu 2+ (q) Sn 2+ (q) + Cu(s) Given: E o Cu 2+ /Cu = V, wht is the E o Sn 2+ /Sn V b V c V V 5- Arrnge the following rections ccoring to incresing ΔS. 1. CH 4 (g) + H 2 O(g) CO(g) + 3H 2 (g) 2. C(s) + O 2 (g) CO 2 (g) 3. H 2 O 2 (l) H 2 O(l) + 1/2O 2 (g). 1 < 3 < 2 b. 2 < 3 < 1 c. 2 < 1 < 3. 3 < 2 < 1 2

3 6- The equilibrium constnt t 427 o C for the rection N 2 (g) + 3H 2 (g) 2NH 3 (g) is K p = Clculte the vlue of ΔG o for the rection t 427 o C.. 54 kj b. 54 kj c. 33 kj. 33 kj 7- Which of the following sttements bout ΔG is FALSE?. spontneous rections lwys hve negtive ΔG vlues b. ΔG is t stnr conitions (1 tm, 1 M) c. ΔG = ΔH TΔS. spontneous rections re lwys exothermic 8- Consier the following rection: 2NO(g) + N 2 (g) 2N 2 O(g) ΔH o = 16 kj/mol Given: Sº(NO) = 210 J/molK, Sº(N 2 ) = 190 J/molK, Sº(N 2 O) = 220 J/molK. At wht temperture will ΔGº = 0 n below which the rection will be spontneous?. 3.9 K c. 321 K. 94 K. 367K 9- Consier the rection: Mg(OH) 2 (s) Mg 2+ (q) + 2OH (q) Ksp = Wht is the ph of the solution?. 3.7 b c Wht is the ph of solution in which 25.0 ml of M NOH re e to 10.0 ml of M HCl? b c

4 11- Which of the following slts will be the lest soluble in H 2 O?. AgCl (Ksp = 1 x 10 8 ) b. AgF (Ksp = 1 x 10 6) c. AgI (Ksp = 1 x ). AgBr (Ksp = 1 x ) 12- Wht is the ph of 0.01 M solution of KOCl. k (HOCl) = 1 x b. 4.0 c Wht is the ph of 0.1 M solution of bse tht hs K b = 1 x b. 3.0 c Which of the following slts will prouce bsic solution when issolve in wter?. KClO 4 b. NH 4 NO 3 c. Li 2 CO 3. N 2 SO Consier the rection: H 2 (g) + H 2 N-NH 2 (g) 2NH 3 (g) Keq = 36 Initilly, [H 2 ] = [H 2 N-NH 2 ] = 0.2 M, n [NH 3 ] = 2 M. Wht is the concentrtion of [NH 3 ] t equilibrium?. 2.2 b. 0.2 c Wht is the equilibrium constnt for the following rection: 2NO(g) + Cl 2 (g) 2NOCl(g) when [NO] = 4M, [Cl 2 ] = 2M, n [NOCl] = 2M t equilibrium b. 2 c

5 17- Consier the following rection: CCO 3 (s) + 2HCl(q) CO 2 (q) + CCl 2 (q) + H 2 O(l) ΔHºrxn = 50 kj/mol. Which of the following will NOT shift the equilibrium to mke more proucts?. Aing more HCl(q) b. Aing more CCO 3 (s) c. Removing CCl 2 (q). Cooling the rection 18- Consier the following rections. In which cses is the prouct formtion fvore by ecrese temperture? 1) CO 2 (g) + C(s) 2 CO(g) H o = kj 2) N 2 (g) + 3 H 2 (g) 2 NH 3 (g) H o = kj 3) CO(g) + 2H 2 (g) CH 3 OH H o = kj 4) N 2 (g) + O 2 (g) 2 NO(g) H o = 181 kj. 2, 3 b. 1, 4 c. 2, 4. 3, Wht is the kinetic rte lw for the following t: Exp # [A] [B] Rte rte = k[a][b] b. rte = k[a] 2 [B] c. rte = k[a][b] 2. rte = k[a] 20- The enthlpy of ctivtion of first orer rection is 105 kj/mole. The rte constnt t 45 o C is 3.54 x 10-5 s -1. Wht is the rte constnt (s -1 ) t 60 o C? x 10-5 b x 10-5 c x x The rte constnt of secon orer rection is 3.83 x 10-3 M -1 s -1. Wht concentrtion of rectnt will remin fter 142 sec for n initil concentrtion of M? b c

6 g of non electrolytic solute is issolve in 20 g of liqui to elevte the boiling point of the liqui by C. Wht is the moleculr weight of solute? K b = o C/m g/mol b g/mol c. 202 g/mol. 234 g/mol 23- Which of the following queous solutions shoul hve the lowest osmotic pressure? M sucrose t 25 o C b M NCl t 25 o C c M CCl 2 t 25 o C M sucrose t 50 o C 24- The ensity of M solution of Pb(NO 3 ) 2 solution is 1.18 g/cm 3? Wht is the mollity of the solution? (formul weights of Pb(NO 3 ) 2 = 331.2) b c Which chrcterizes the wek inter moleculr forces of ttrction in liqui?. High boiling point b. High vpour pressure c. High criticl temperture. High het of vporiztion Goo Luck 6

Homework 04. Acids, Bases, and Salts

Homework 04. Acids, Bases, and Salts HW04 - Acids, Bses, nd Slts! This is preview of the published version of the quiz Strted: Feb 21 t 8:59m Quiz Instruc!ons Homework 04 Acids, Bses, nd Slts Question 1 In the reversible rection HCN + H O