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There are two samples labeled A and B. Sample A is a physical mixture of GaP and GaAs in a 1:1 mole ratio. Sample B is a GaP0.5 As0.5 solid solution. Are samples A as well as B distinguishable by elemental analysis, X-ray diffraction, absorption spectroscopy or emission spectroscopy? Offer a one sentence explanation for each.
A sample of a commotion whose half-life is known to be 7.50 minutes was measured from 10:03 to 10:13. The total number of counts evidence in this 10-minute interval was 34,650. Explain what was the activity of the sample in counts per minute at 10..
The solubility of oxygen in lakes high in the Rocky Mountains is affected by the altitude. If the solubility of O2 from the air is 2.67 × 10-4 M at sea level and 25°C.
How much heat per mole (if any) was exchanged by it's system and it's surroundings. And in which direction did the heat flow
A sample of 1.0 mole of a perfect gas with cp= 20.8 J K-1 is initially at 3.25 atm and 310K. If it undergoes reversible adiabatic expansion until its pressure reaches 2.50 atm. Calculate the final volume and temperature and the work done.
a mixture is prepared by mixing a 0.10 l solution of 0.12 m nacl with a 0.23 solution of 0.18 m mgcl2. what volume of a
using the same sample of gas p1 405 torr t1 1 degree celsius we wish to change the pressure to 4050 torr with no
What observed rotation is expected when 1.58M solution of (R)-2-butanol is mixed with an equal volume of a 0.790 M solution of racemic 2-butanol, and the resulting solution is analyzed in a sampling container that is 1 dm long
The electrolysis of molten A12O3 at 980 ºC is used to produce metallic aluminum. A current of 658 A is used in the electrolysis cell. What is the rate of formation of aluminum, in kilograms per hour
Consider the following generic chemical equation. 2A+4B ---> 3C. What is the limiting reactant when each of the following amounts of A and B are allowed to react? 2 mol A; 5 mol B 1.8 mol A; 4 mol B 3 mol A; 4 mol B 22 mol A; 40 mol B
Nitrogen Oxide is a pollutant in the lower atmosphere that irritates the eyes and lungs and leads to the formation of acid rain. Nitrogen oxide forms naturally in the atmosphere according to the following endothermic reaction
calculate the ph of a solution formed by mixing 250.0 ml of 0.15 m nh4cl with 100.0 ml of 0.20 m nh3. the kb for nh3 is
a good yield of photosynthesis for agricultural crops in bright sunlight is 2000.kg of carbohydrate e.g. sucrose per
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