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Why is it important that very little current allowed to flow in the anthropometric experiment?
Consider the normal freezing point of water. What are the signs (positive or negative) of ?S and ?H for the freezing of liquid water to form ice and what is the ratio of ?H/?S at standard pressure?
This diluted solution is then analyzed in a spectrophotometer and found to have [I-] of 1.59 x 10-3 M using the regression equation from the graph. Calculate the Ksp of PbI2 using this data.
What factors determine whether a collision between two molecules will lead to a chemical reaction?
Explain the changes in PKa values in relation to PH changes.
Pure liquid octane (d = 0.7089 g/mL) is used as the fuel in a test of a new automobile drive train. How much energy (in kJ) is released by complete combustion of of all the octane in a 15.2 gal fue
Gaseous ammonia ({rm{NH}}_3 ) reacts with gaseous oxygen to form gaseous nitrogen monoxide and gaseous water.
A standard men's basketball has a circumference of 29.5 inches. If I fill the ball with Helium to the ewcommended 9.0 psi at room temperature (25 c), how many grams will the Helium in the ball weigh
A 295mLflask contains pure helium at a pressure of 742torr . A second flask with a volume of 465mL contains pure argon at a pressure of 717torr .If the two flasks are connected through a stopcock a
A hypothetical element has an atomic weight of 45.12 amu. The two isotopes of this element have mass numbers of 43 and 46. What is the percent abundance of the isotope with the mass number of 43?
A student mixes 86.9 g of water at 69.4°C with 54.9 g of water at 23.0°C in an insulated flask. What is the final temperature of the combined water?
What specific observation identifies the endpoint of the titration? What is the molar concentration of K+ (aq) in the reaction mixture at the equivalence point?
When 0.425 g of magnesium was added to 150.0 mL of 1.00 M HCl in a coffee-cup calorimeter the temperature of the solution increased from 24.5°C to 35.3°C. Given that the heat capacity of the
A weather balloon contains 233 L of helium at 22 °C and 760. mm Hg. What is the volume of the balloon when it ascends to an altitude where the temperature is -54 °C and 511 mm Hg?
Christa and Sal are anticipating the birth of their first baby. Before the baby arrives, they want to fix up the nursery with new wallpaper. They seek the advice of a developmental psychologist. Wh
A solution is made by dissolving 3.14 g of NaCl in 79.9 mL of water. What is the concentration of sodium chloride in units of weight/volume percent?
Write an equation for any reaction that occurs after each step and calculate the concentration of Ba,CL,NO3,NH4 in the final solution assuming that all reaction go to completion.
A saline solution used in intravenous drips for patients who cannot take oral fluids contains 0.92% (w/v) NaCl in water. How many grams of NaCl are contained in 729 mL of this solution?
If the solution were .0100mol of a weak acid in 10.0L of water would the pH be the same, higher, or lower than that in the strong acid solution? Why?
A gas cylinder containing 6.38 mol of neon has a pressure of 491 mm Hg at 295 K. If 3.22 mol of helium is added to this cylinder, at constant temperature and volume, what will be the pressure in the
A solution is prepared by adding some solid BaF2 to water and allowing the solid to come to equilibrium with the solution. The equilibrium constant for the reaction below is Kc = 1.3x10-6.
How much heat is required to vaporize 329 g of liquid ethanol at its boiling point? ΔHvap = 38.6 kJ/mol. How much heat is evolved when 1241 g of water condenses to a liquid at 100°C? Δ
The rate of disappearance of HCl was measured for the following reaction:
A solution is prepared by mixing 40.0 mL of 0.015 M BaCl2 and 180. mL of 0.045 M K2SO4. What are the concentrations of barium and sulfate ions in this solution? Assume only SO42- ions (no HSO4&oline
The relative concentration of products and reactants that will be present once equilibrium is reached? is this reaction likely to be the good source of the products.