Question

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A4 The molecular dipole vector is the sum of bond polarities and indicates the direction and extent of polarity on a molecule, the vector arrow points from the net negative domain towards the net positive domain. Identify which ONE of the following molecules has the molecule polarity correctly indicated by the dipole vector H H H H H H H H H H H (A) (B) (C) H H H H H (D) (E) A8 When a hot 500 g aluminium block was temperature of 200 g of water increased from 25 °C to 60 °C. Calculate the amount of heat lost by aluminium. (Specific heat of water 4.18 J K g') dropped into a water bath, the kJ (A) 29 (B) 73 kJ (C) 257 kJ (D) 643 kJ (E) 102 kJ A9 Consider the following reactions and identify which ONE will result in the largest positive change in entropy of the system (AS) 2NH3(g) (A) N2(g)3H2(g) BaCl2.2H20(s) BaCl2(s) 2H20(g) (B) (C) 2HI(g) H2(g)2(s) + NH4CI(s) (D) NH3(g)HCl(g) (E) H20(g)H20() A10 At what temperature will graphite and diamond be in equilibrium at 100 kPa independent of temperature) pressure? (Assume that AH and ASe are AsH(kJ mol) Substance C(s, graphite) 0.0 5.9 C(s, diamond) 2.1 2.6 (A) 0.62 K (B) 620 K (C) 2400 K (D) Graphite is more stable than diamond at all temperatures. (E) -0.64 K A14 A mixture of gases is prepared in a sealed container at the relative partial pressures of 5 kPa COCI2, 0.1 kPa CO and 0.01 kPa Cl2. The reaction that occurs is described by the following chemical equation: CO(g) Cl2(g)coC2(g) Kp 1.5 x 104 + = Q> Ko so the relative amounts of reactants are observed to increase (A) Kp so the relative amount of product is observed to increase (B) Q Kp so the relative amount of product is observed to increase. so the relative amounts of reactants are observed to increase (E) Q Kp A18. Identify the CORRECT equilibrium constant expression for the following reaction. S8(s)8H20() 8H2S(aq)402(g) + S,HO (A) К- ['ol[sH 1 КЕ (B) 4 2 [S.JноT HSTT0,J (C) КЕ 1 (D) K = 8HS[40,1 1 К 3 (E) HSTO, A21. Monochloroacetic acid (CICH2COOH; pKa = 2.87) is often used in cosmetics such as facial peels, the pH of a 0.10 M aqueous solution of monochloroacetic acid is: (A) 1.93 (B) 1.96 2.86 (D) 3.32 E) 3.65 A23 100 mL of a saturated solution of silver sulphate (Ag2SO4) was found to contain 3.11 millimoles of silver ions at 25 °C. What is the value of Ksp? 4 9.6 x 10 (A) 1.6 x 10-8 (B) (C) 1.2 x 104 -6 |(D) 7.5 x 10 1.5 x 10-5 (E) A25 What is the molar solubility of cobalt carbonate, COCO3, in an aqueous solution containing 0.3 M sodium carbonate at 25 °C? (Cobalt carbonate Ksp = 1.0 x 1010) -5 1.0 x 10 (A) M 5.48 x 10 (B) M (C) 0.3 M 3.3 x 10-10 M (D) 1.0 x 1010 M (E) A27. Which of the following ionic solids will precipitate first when an aqueous solution of ammonium sulphide, (NH4)2S, is added to an aqueous mixture of Pb2*, Cd2*, Ag*, Cuand Fe ions at the same 0.01 M concentration? 10-19 10 27) (A) FeS |(Ksp 8 x |(B) (Ksp CdS = 1 x (Ksp 3 x 10 28) PbS (C) (Ksp 2 x 10 38) (D) CuS 10-51) Ag2S (Ksp 6 x (E) АЗ0. Consider the following UNBALANCED half reactions: E S2O32 = 0.40 V H2SO3 T. E НОСI = Cl2 = 1.63 V Identify the BALANCED redox reaction that takes place spontaneously between H,SO3, S203*, HОСІ, and Clz. S2032 4НОCІ + + 4H (A) 2C12 2H2SO3H20 + S2032- 4HОCI + 2H (B) 2C12 2H2SO3 H20 + S2032H20 2НОCI + 2H2SO3 (C) Cl2 S2O32 H20 2H2SO3 2НОCІ + (D) Cl2 + + S2O32 2H2SO3 5H20 (E) 2НОCI + + 4H* Cl2 + A35 A concentration cell is assembled with copper electrodes immersed in Cu2 beaker, the [Cu2'] = 1.0 x 103 M and in the other 2.0 M. Calculate the potential for this cell at 25 °C aqueous solutions. In one beaker the [Cu2] Cu2 (aq)2 e - Cu(s) +0.34 V 0.24 V (A) (B) -0.24 V (C) 0.098 V (D) -0.098 V (E) 0.78 V

Answer 1

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