Question

Which statements about viscosity are true? 0 (ii) (1) Viscosity increases as temperature decreases. Viscosity increases as molecular weight increases. Viscosity increases as intermolecular forces increase. A) (i) only B)(ii) and (ii) C) (i) and (iii) D) none E) all ANSWER. Write the word or phrase that best completes each statement or answers the question. 18) The rate-determining step is the elementary step 18) IPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 19), 19) Calculate the freezing point of a solution containing 25 grams of KCl and 2750.0 grams of water. The molal-freezing-point-depression constant (K for water is 1.86 °C/m. (Assume 100% ionization of KCL.) A) +0.23 °C B) +0.45 °CC ) -0.23 °CD ) -0.45 °C E) 1.23 °C RT ANSWER. Write the word or phrase that best completes each statement or answers the question, 20) An aqueous solution with a concentration of 18 ppm indicates that there is per 20). liter of solution. 21) TIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 21) Pressure has an appreciable effect on the solubility of in liquids. A) liquids B) solids C) gases D) solids and liquids E) salts 22) in the galvanic cell using the redox reaction below, the oxidation half reaction is Zn (s) + Cu2+ (aq) - Zn2+ (aq) + Cu (s) A) Cu2+ + 2e - Cu C) Zn +2e - Zn2+ B) Cu2+ - Cu +2e D) Zn - Zn2+ + 2e

Answer 1

vi'socit y I'n creases as molecular weight increases VI'S COCrty as i'ntermolecular 1ncreases forces 1°n creases vi'Socity fn creases Temp, I'ncreases aus [ gases as Temp But vi'socity decreases iigurds

Rate deter minfng step s the owest elementar tep f'xmy Kp 4 TF molality my mass of kel x 1000 11 molecular mas x mass of water (gm) of KCi 1000 X 2750 259m 74.5513 gmlmol - 0.1213416 moles| kg KCI 1= 2=2 100 10 P0nizati'on 1:86 OC/M KF 2x6.121941 x 1.86 = 0.453622 °C TT TF normal freezing poi'nt =0'C 0.4536220c O.450C - 00453622°C Tf

20 Volume of Solvent Volume of Solution PPM Vso) vent x1o 8 PPm 14 Vsoluton Vsolvent 18 X16 0.018X10 solution 1Leter of Solution O018 mL per Liqur'd Solfd 's Solubi'ltty does not Pressure depend on depends on Soluirty of gases But PYessure 22 Oxi'dation RXn Chalf) 2e- znte car)