Colligative Porperties : Freezing Point Depression - Salt and Sugar
Salt lowers the freezing point of water. So will sugar. If one tablespoon of solid (salt or sugar) is dissolved in ¼ cup of water, which material, salt or sugar will lower the freezing point of the water by the greater amount? Why?
Amino Acids With Two Chiral Centers
Chiral compounds occur when a carbon atom has four different things bonded to it. All but the simplest amino acids (glycine) are chiral because the alpha carbon has an amine group, a carboxylic acid group, and two different groups bonded to it. Some amino acids are even more complicated in that another carbon in the molecule i ...continues
Extracting gold from seawater: How many grams of Au are there in the whole ocean? With a 60% recovery possible, how many liters of seawater must be processed for gold to obtain 1 kg of that metal? - MW of Au = 196.967 gram/mole - Avg. seawater concentration of Au = 2.5 x 10^-11 mole/kg of seawater - mean density of s ...continues
Molar Concentration of Copper (II) Nitrate
A 25.00 mL sample containing Cu2+ gave an instrument signal of 23.6 units (corrected for a blank). When exactly 0.500 mL of 0.0287 M Cu(NO3)2 was added to this solution, the signal increased to 37.9 units. Calculate the molar concentration of Cu2+ assuming that the signal was directly proportional to the analyte concentration.
The data in the table below were obtained during a colorimetric determination of glucose in blood serum. Glucose Absorbance, concentration, NM A 0.0 0.002 2.0 0.150 ...continues
Resistors, Resistance, Power and Voltage
Cn you please help me with problem 2-1 on the attached homework? The answers are a. R1=500 ohms R2=2.0 k ohms R3=2.5 k ohms b. 5.0 V c. 0.002 A d. 0.02 W Please show me how to get these.
In this introduction are given the explanation of how to find out an empirical formula if one has found out the chemical elements of an unknown substance and measured their ratio of masses. Also, it is described how one can calculate the ratio of masses from a given empirical formula. Two examples and the explanation of the pri ...continues
Fish produce glycerol to survive the freezing waters of the Arctic. Determine the degree to which the freezing point of blood and other biological fluids is lowered with the help of glycerol. What is the ideal concentration range of glycerol required to achieve this?
Determining Concentration of Mercury using Absorbance Values
Exercise: A sample of 1.500g of gold was analyzed to determine mercury in the same one. It was come by the method of standard addition preparing solution a standard Hg mercury (II) putting under it conditions similar to the one of the sample: Standard solution: An amount of 50 mg of pure mercury becomes to Hg (II) and is ad ...continues
Heavy Metal Testing, Graphite Furnaces and ICP
I need help with investigating and writing a proposal for Heavy metal testing using Graphite Furnace. This will include capabilities, limitations and costs (possibly cost comparison with ICP).
