Questions asked by Steelballs

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• Find the solutions of the following equations in complex?
  
• Calculate Cn and Sn?
  
• The volume of a cylinder is given by V=πr^2h . If each of the radius and height of the cylinder increases by 2%, what is the increase in its volume and its surface area?
  
• When you stand with bare feet in a wet bathtub, the grip feels fairly secure, but yet a catastrophic slip is quite possible?
  
• A solution contains 0.025 M Ca2+ and 0.015 M Ag+. Determine whether it is possible to precipitate 99% of Ca2+ by sulphate without precipitating Ag+?
  
• Antimony is obtained by heating pulverized stibnite (Sb2S3) with scrap iron and drawing of the molten antimony from the bottom of the reaction vessel?
  
• What is the pH of a solution prepared by dissolving 1.23 g of 2-nitrophenol in 0.250L? pKa=7.00
  
• Calculate the limiting value of the fraction of dissociation (α) of a weak acid (pKa = 5.00) as the concentration of HA approaches 0. Repeat the same calculation for pKa = 9.00.?
  
• From the equilibrium constants below, calculate the equilibrium constant for the overall reaction?
  
• The pH of 0.010 M o-cresol is 6.05. Find the pKa for this weak acid.? Cresol: C6H4(OH)(CH3)
  
• A manometer containing mercury is connected to two points A and B 15 m apart, on an inclined pipeline conveying water as shown.?
  
• A refrigerated truck has a dimension of 12m*2m*3m. The cargo space at the refrigerated truck is to be cooled from 25(oC) to 6(oC). The heat lost by transmission is 1kJ/s and the power input of the refrigeration system is 10kW?