Posts by Mahtab
Total # Posts: 7
consider a random mixture of two particles,diamond and SiC.Assume all particles are spherical with a radius of 0.100mm. The mixture is 80.0 wt% diamond(density=3.51 g/ml) and 20.0 wt% SiC (density=3.23 g/ml) a)Calculate the mass of a single particle diamond and the number of ...
October 2, 2012
the calciul content of person's urine was determined on two different days to be: day1: Average Ca(mg/L)=238 Number of measurements=4 day2 Average Ca:268 Number of measurements=5 The analytical method was used known to have a standard deviation of 14mg/L based on many ...
October 2, 2012
chemisry.Electrochemical Measurement of Concentrat
A calibration curve to show how the cell potential varies with [Cu2+] may be constructed. A plot of cell potential (in V, with the same sense as in question 1) versus log10[Cu2+] should yield a straight line. What is the slope of this line? The answer should be -0.0591/2 but ...
April 9, 2012
Chemistry ,Reactions at Electrodes during Electrol
Reactions at Electrodes during Electrolysis Which half-reaction will take place at the cathode during the electrolysis of molten MgCl2? 2Cl- > Cl2 + 2e- Cl2 + 2e- > 2Cl- Mg2+ + 2e- > Mg Mg > Mg2+ + 2e- Which half-reaction will take place at the cathode during the ...
April 8, 2012
Ksp The solutions at the two Pb electrodes of a concentration cell were prepared as follows: Cell A: A mixture of 1.00 mL of 0.0500 M Pb(NO3)2 with 4.00 mL of 0.0500 M KX (the soluble potassium salt of an unspecified monovalent ion X-). Some PbX2(s) precipitates. Cell B: 5.00 ...
April 4, 2012