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- An enzyme-catalyzed reaction has a Km of 1 mM and a Vmax of 4 nmole/L sec-1. The reaction velocity (nmole/L sec-1) when the substrate concentration is 0.25 mM is: A. 1.25 B. 10.0 C. 5.0 D. 0.50 E. 1.0 F. 100 G. 150 H. 55 I. 7536 I. FilteringII. EvaporationIII. Magnet zoomIV. Dissolving in waterIn what order should the above processes be applied to separate a mixture of iron powder, naphthalene and table salt into its components? a) II, III, I, IV B) IV, I, III, II NS) IV, III, I, II D) III, IV, I, II TO) III, IV, II, IUsing the following data to calculate Ksp for PbSO4. ε° PbO2 + 4H+ + SO42- + 2e-→ PbSO4(s) + 2H2O +1.69 PbO2 + 4H+ + 2e-→ Pb2+ + 2H2O +1.46 (Hint: Write the general reaction for PbSO4) a. 1.7 × 10-8 b. 5.9 × 107 c. 2.5 × 10-107 d. 4.0 × 10106 e. 3.4 × 10-18
- The formation constant for the complexation of Mg2+ by EDTA is logKflogKf = 8.79. The conditional formation constant (Kf’) at pH 8 (αY4−αY4−= 4.2 x 10-3) is: 0.037 2.6 x 106 5.14 1.5 x 1011 6.42I– (aq) + H2O2 (aq) + 2H3O + (aq) → I2 (aq) + 4H2O (l) (slow) C6H8O6 (aq) + 2H2O (l) + I2 (aq) → C6H6O6 (aq) + 2H3O + (aq) + 2I– (aq) (very fast) I2 (aq) + I– (aq) ⇌ I – 3 (aq) I3- (aq) + starch → blue I3- · starch complex (aq) (fast) A different 0.100 L reaction mixture is prepared with initial concentrations of 1.0×10−2 M iodide I– , 2.0 × 10−3 M ascorbic acid C6H8O6 , and 0.135 M hydrogen peroxide H2O2 . If the first two reactions above procede at the same rate (they’re limited by the first one!), which of these reactants will be completely consumed first?6. Sodium chloride, β-D-fructofuranosyl α-D-glucopyranoside or sodium chloride - β-Dfructofuranosyl α-D-glucopyranoside solutions are used for dehydration of pumpkin.a) Estimate the water activity of 30% β-D-fructofuranosyl α-D-glucopyranoside solution.b) Estimate the water activity of 30% sodium chloride solution.c) Estimate the water activity of solution 20% sodium chloride and 20% β-Dfructofuranosyl α-D-glucopyranoside solution.d) What do you think about the effectivity of these solutions if the water activity of pumpkins are 0.945?
- The Ksp of Al(OH)3 (MM: 78) is 1.90 xx 10^(-33). a) What is the solubility of Al(OH)3 in g/L?Study the structure of the different tetrabasic forms of EDTA. Describe their individual reactivities (Figure 4-6).The company performs accelerated ageing studies in which a suspension of D is stored at different temperatures. They obtain the degradation rate constants in the table below. Calculate the rate constant for degradation at 25 ºC. (45 % of marks) T / ºC k / d-1 40 0.28 50 0.56
- Effect of dose on adsorption percentage of cadmium onto magnetite (pH 7; adsorbent dose = 0.05, 0.1, 0.5, 0.10, 0.15 g; initial concentration 100 ppm, T = 25°C, 150 rpm, Contact Time = 2 h) performed with ASS instrument. What is the optimal dosage?4. determine the amount in mg of the amount of Ag present from ICP mass digested: 1.0821g/L dilution of 10ml stock solution to 100ml volumetric flask X=0.98 (intensity)8.00mL aqueous suspension of elemental selenium is treated with 24.00mL ammonia 0.045M AgNO3 The reaction is as follows: 6Ag (NH3) 2 ++ 3Se (s) + 3H2O → 2Ag2Se (s) + Ag2SeO3 (s) + 6NH4 + After this reaction is completed, nitric acid is added to dissolve Ag2SeO3. However, Ag2Se does not dissolve during this time. Ag + consisting of dissolved Ag2SeO3 and the excess of the reagent requires 13.43mL 0.01294M KSCN in a Volhard titration. How many milligrams of Se are in each milliliter of sample? (Se = 78.96g / mol)