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When a beam of alpha particles passes between two electrically charged plates, the beam is deflected toward the positive plate. A) true B) false Boron oobtained from borax deposits in Death Valley consists of two isotopes. They are boron -10 and boron -11 with atomic masses of 10.013 amu and 11.009 amu, respectively. The atomic mass of boron is 10.81 amu (see periodic table). Which isotope of boron is more abundant, boron-10 or boron-11?
A) boron-11
B) boron-10
C) cannot be determined from data given
D) neither, their abudances are the same.
A copper refinery produces a copper ingot weighing 75 kg. the density of the copper is 8.94 g/cm^3. if the copper is drawn into a wire whose dimeter is 8.250mm
If the pressure exerted on a 375 ml sampe of Hydrogen gas at a constant temperature is decreased from 1.75 atm to 1.00 atm, what will the final volume of the sample be
other animals have similarly adapted to using small molecules as allosteric effectors to encourage hemoglobin to
1-Napthaleneacetic acid is not soluble in water at room temperature but goes into solution readily when heated.
what mass of sodium fluoride must be added to 250. ml of a0.100 m hf solution to give a buffer solution having a ph
2 mL of 1,2-dichlorobenzene was added to a 250 mL volumetric flask, then it was diluted to 250 mL with benzene. A capacitance cell was submerged into this solution, then the cell was attached to a frequency counter. The frequency response was meas..
On a mission to a newly discovered planet, an astronaut finds chlorine abundances of 13.85% for 35Cl and 86.15% for 37Cl . What is the atomic mass of chlorine for this location. The mass of 35Cl is 34.97 amu. The mass of 37Cl is 36.97 amu.
Calculate the ratio of dihydrogen phosphate to hydrogen phosphate in the blood at pH 7.4. The Ka = 6.3 x 10 -8 5. 2.
Calculate the volume of 0.540 M sodium hydroxide solution contains 11.5 grams of sodium hydroxide?
A standardized solution that is 0.0100 M in Na is essential for a flame photometric determination of the element. Explain how many grams of primary-standard-grade sodium carbonate are necessary to prepare 700.0mL of the solution
The blank solution used to calibrate the spectrophotometer s 10.0mL of 0.2 M Fe(NO3)3 diluted to 25.0 mL with0.1 M HNO3. Why is this solution preferred to simplyusing de-ionized water for the calibration
Ozone molecules in the stratosphere absorb much of the harmful radiation from the sun. How many ozone molecules are present in 1.00 L of air under the stratospheric ozone conditions of 227 K temperature and 1.89 * 10^-3 atm pressure
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