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Explain how would you expect the quantity of solvent and rate of cooling to affect yield and the purity? Discuss what are your expectations from the given modifications?
Consider a 5.43g mixture of Fe3O4 and FeO. You react this mixture with an excess of oxygen to form 5.779g of Fe2O3. Determine the percent by mass of FeO in the original mixture.
Suppose all the angles to be exact. The critical angle for net internal reflection in a certain media boundary is around 37 degrees.
A 4.37 gram sample of a certain diatomic gas occupies a volume of 3.00 liters at the 1.00 atm and a temperature of 45oC. Find out what is this gas?
If the angle of inclination with the horizontal reaches 40°, the box begins to slip and it slides 2.4 m down the plank in 4.5 s at constant acceleration. Determine the coefficient of static fric
Suppose you have a sample of a saccharin containing sweetener with a mass of 0.2140g. Saccharin, an artificial sweetener, has the formula C7H5NO3S.
Determine the ratio of the number of moles of cyclopropane to moles of oxygen if a balloon contains an anesthetic mixture of cyclopropane (cp) and the oxygen (O2) at 170 torr and 570 torr respective
He then turns the hubcap over, keeping it the similar distance from his face. He now observes an image of his face 10.4 cm in the back of hubcap. (i) Determine how far is his face from the hubcap?
After all of the metal had dissolved, the left over acid was titrated with the 0.1054M NaOH. If 24.36 mL of 0.1054M NaOH was needed to neutralize the leftover acid, explain what the atomic mass of t
The chocolate bar is scored into smaller squares or rectangles. Player who moves last wins. Examine the game and find who wins, first or second player, and what winning strategy is.
Determine what magnetic field strength could you get within a 2.9 diameter solenoid wound with the wire as closely spaced as probable?
A diamond which is having 5.0 x 10^21 atoms of carbon. Determine how many moles of carbon and calculate how many grams of carbon are in this diamond.
A certain radioactive element emits a gamma ray with a frequency of 1.13 x1020 Hz. Gamma rays are electromagnetic radiation of very short wavelength emitted by the nuclei of radioactive elements.
A certain crystal provides a deflection angle of 30 degrees for the first-order maximum of monochromatic X-rays having a frequency of around 4.4 × 1017 Hz.
The atomic mass of an a particle is around 4.002 603 u . With the energy released in 3.66 days determine amount in kilograms the ice could be melted at 0*C?
Explain what will be the result if a student extracts first with NaOH then with NaHCO3. Explain why are the acidification steps necessary after the two extractions?
The take-up reel of a cassette tape consists of an average radius of 1.4 cm. Determine the length of tape (in meters) which passes around the reel in 56 s if the reel rotates at an average angular s
Determine expected holding period return over next year? How much of this return is due to capital gains (price appreciation) and how much is attributable to dividend yield?
Assume that you carry out an analytical procedure to generate a calibration curve. Then you analyze an unknown and find the absorbance that gives a negative concentration for the analyte. What does
Calculate the kinetic energy of an electron (in J) that is ejected from the sodium by light with a wavelength of 340 nm? Electrons are ejected from the sodium metal by any light that has a wavelengt
When we take the diameter of a proton to be 1.0* 10^ -15 m, then what would be the mass of the mini black hole?
What is the concentration of H2S in mg/L when the hydrogen sulfide, which is extremely toxic to humans, can be detected at a concentration of 2.00 ppb and which is having the densi
Glycine is an amino acid made up of hydrogen, carbon, oxygen, and the nitrogen atoms. Combustion of a .2036 gram sample gives the 1.00 atm and.122 g of water and 132.9mL of CO2 at 25oC.
Determine the final temperature inside the calorimeter (c of copper =0.387 J/g·K)? One piece of copper jewelry at the 105°C has exactly twice the mass of another piece, which is at t
The company is submitting bids for 2 different projects, project A and project B. Find probability of winning at least one of the bids?