Start Discovering Solved Questions and Your Course Assignments
TextBooks Included
Active Tutors
Asked Questions
Answered Questions
If the fluoride is consumed as sodium fluoride (45.24% ), what amount of sodium fluoride contains the recommended amount of fluoride?
Ethanol has a vapor pressure of 7.9 x 103 Pa at 25ºC. Determine the free energy difference between ethanol in the liquid state at 25ºC and ethanol vapor at 1 bar pressure at 25ºC.
A solution is 40% acetic acid by mass. The density of this solution is 1.049 g/mL. Calculate the mass of pure acetic acid in 140mL of this solution at 20C.
Lactose is a sugar most commonly found in milk and is made up of carbon, hydrogen and oxygen. After analyzing a sample of it there was found to be 42.1 % of carbon, 6.46% of hydrogen and 51.4% of ox
No electrons are emitted from the surface of metallic Cs until the frequency of the radiation reaches 4.50 x 10^16 Hz. Find the energy required to remove the electron from the metal surface.
A 1.800 g sample of phenol C6H5OH was burned in a bomb calorimeter whose total heat capacity is 11.66 kJ/C degree. The temperature of the calorimeter plus contents increased from 21.36 C degree to 2
The density of phosphorus vapor at 310 degrees celcius and 775 mmHg is 2.64g/L. what is the molecular formula of the phosphorus under these conditions?
Most chips will easily corrode when immersed in a salt solution similar to the one required to use the BARC sensor- yet why is the BARC biosensor is able to withstand corrosion in such a strong salt
In a blimp the gas pressure is 605.2mm and outside air temperature is -5.8 degrees Celsius. The volume of the gas chamber in the blimp is 199,630 cubic feet.
Calculate the pH of a buffer prepared by dissolving 240.0g of ammonium chloride and combining it with 400.0 mL of 12.0M ammonium hydroxide (NH4OH, but you can treat it as 12.0 M NH3) and diluting to
The force generated in a living cell by elongation of a single actin filament is approximately 1 pN. Calculate the work done by this actin filament when it moves the cell membrane 0.10 micron.
The question reads: In addition to carbon monoxide (CO) and carbon dioxide (CO2) there's a third com-pound of carbon and oxygen carbon suboxide.
Acetic acid vapour contains a proportion of planar, hydrogen-bonded dimers. The relative permittivity of pure liquid acetic acid is 7.14 at 290K and increases with increasing temperature. Suggest an
Suppose the solubility of your unknown carboxylic acid is 6.8g/ml water at 95C and 0.17g/ml water at 0C. Given that you use 150 ml of water in the recrystallization.
A 0.1723-g sample of solid magnesium is burned in a bomb calorimeter that has a heat capacity of 1769 J/° C. The calorimeter contains exactly 311 g of water, and the temperature increases by 1.1
Suppose the barium sulfate weighed in the crudible above was not completely dry. How would this affect the concentration calculated for the barium hydroxide?
The equilibrium constant for the hydrolysis of the dipeptide alanylglycine by a peptidase enzyme is K = 8.1 x 102 at 310 K. Calculate the standard reaction Gibbs energy for the hydrolysis.
How many grams of gold are required to provide a gold coating 0.40 mm thick on a cylinder having a diameter of 0.70 inches and length of 6.0 inches?
How many grams of sodium sulfate should be added to how many grams of sulfuric acid to give 1.00 L of buffer with pH 2.80 and a total sulfur concentration of 0.200 M?
If you wish to further purify this liquid after column chromatography, what techniques could you use? What would the limitation of carrying out this technique be?
You plan to purify a product by column chromatography using silica gel as your stationary phase. What is the minimum mass of silica gel needed to carry out purification?
A tire holds air (assume it's all N2) at a pressure of 3 atm, and in one week the pressue drops by 1% because of inevitable leakage at the rim, when the temperature is 300 K.
How do you calculate the concentration of oxalic acid and potassium permanganate for each run when you are given the stock concentration of each compound and the amount of Liters in each run.
In humans, oxygen is effectively delivered to the tissues because of the presence of several allosteric modulators. Name three of these modulators and explain how their presence allows oxygen to be