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Which of the following is not a representative particle?
The polarogram for 20ml of solution that was 3.65*10^-3 in Cd2+ gave a wave for that ion with a diffusion current of 31.3µA . calculate the percentage in change in concentration of the solutio
Use the wattage of the lightbulb and the time it is on to calculate change in internal energy in joules (assume that the cylinder and lightbulb assembly is the system and assume two significant figu
A 2.50-g sample of a large biomolecule was dissolved in 37.0 g of carbon tetrachloride. The boiling point of this solution was determined to be 77.85°C. Calculate the molar mass of the biomolec
What is the new volume of gas in liters when a sample of 55.0 neon is added to the neon gas already in the container?
An analysis of a series of repeated measurements produced an equilibrium constant of 4.76 with a standard deviation of .41. Explicitly state the analytical interpretation of this standard deviation
Bromine can be obtained from the decomposition of calcium bromide by means of electrolysis. If 10.0 g of calcium bromide are dissolved in water before electrolysis and if 1.75 L of gaseous bromine i
Pottassium Bromide, KBr, is soluble in the extent of 64 g per 100 g of H2O at 20 degree c. Is the solution saturated or unsaturated?
Estimate how much arginine stabilizes the negative charge of the succinate formed
What fators are generally responsible for the variaion in the base strength of nitrogen bases?
Calculate the change in enthalpy and entropy of 50g of liquid water starting at 10 degrees Celsius and completely evaporating into H2O gas at 100 C.
A colored substance Z has an absorption maximum at 350 nm. A solution containing 2 mg of Z per liter had an absorbance of 0.850 using a 1 cm cell. The formula weight of Z is 148.
Two full bottles contain respectively 1.0 kg of potassium nitrate, KNO3, and 1.0 kg of strontium chloride, SrCl2. Which bottle contains the greater number of moles? How many more moles does it cont
What is the purpose of such an addition? What is the procedure called? Why is the procedure used in this experiment called liquid-liquid extraction?
what are the H3O+ and OH- concentrarions in a 125 mL solution prepared with 0.100 mol pf NaOH and water?
A certain first-order reactio has a rate constant of 3.60×10-3 at 45 . How many minutes does it take for the concentration of the reactant to drop to 6.25% of the original concentration?
Assuming the solution is ideal, calculate the composition of the vapor (in terms of mole fractions) at 25°C. At 25°C, the vapor pressures of pure CH2Cl2 and pure CH2Br2 are 133 and 11.4 torr
Assume that a reaction takes place at 295 K and 305 K. What must the activation energy be for the rate constant to double as described?
A gas occupying a volume of 810. mL at a pressure of 0.970 atm is allowed to expand at constant temperature until its pressure reaches 0.541 atm. What is its final volume?
The dry ice is allowed to sublime and the mixture is allowed to return to 25.0 degrees Celsius. what is the total pressure in the flask?
If the molar mass of the hydrocarbon is 126.3 g/mol, what is the molecular formula of the hydrocarbon
The decomposition of N2O to N2 and O2 is a first order reaction. At 730 degrees Celcius the half-life of the reaction is 3.58x10^3 min. If the initioal pressure of N2O is 2.10 atm at 730 degrees Cel
A sample of oxygen gas is collected over water at 25 degrees C and a total pressure of 637 torr. The volume of the gas collected is 500.0 mL. What mass of oxygen is collected? The vapor pressure of
Sodium carbonate (rm Na_2CO_3) is used to neutralize the sulfuric acid spill. How many kilograms of sodium carbonate must be added to neutralize 6.05×103 kg of sulfuric acid solution?
Of the solvents used, some were very polar (e.g., acetone, ethanol) while others were very nonpolar (e.g., hexane). Did the polarity of the various solvent mixtures seem to affect the completeness