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Atoms, such as sodium, typically give line spectra, as opposed to continuous spectra. Given that such spectra are due to changes in the energies of electrons, explain, using a suitable diagram, what this tells you about the electronic structure of atoms.
silicon has three naturally occurring isotopes. 28si mass 27.976927 29si mass 28.976495 30si mass 29.973770 and 3.10
the volume of blood in the body of a certain deep-sea diver is about 5.63 l. blood cells make up about 55 of the blood
A 5 cm thick beef steak is being frozen in a -30 C room. The product has 73% moisture content, density of 970 kg/m^3, and a thermal conductivity (frozen) of 1.1 W/ (m K). Estimate the freezing time using Plank's equation
What is the density of a sample of air (average molar mass is 28.8 g/mol) that has a pressure of 750torr and a temperature of 27 degrees C?
From this fact, we can deduce that a column of air one square inch in cross-section, measured from sea level to the top of the atmosphere, would weigh approximately 14.7 lb. Given that air has an average molar mass of 28.97 g, calculate the number..
The theoretical energy consumption per kg of aluminum and the current required for the production of 1 metric ton of aluminum per day
Some solid trisodium phosphate, Na3PO4, is added to the solution that is formed by mixing 1L of .002 M Al(NO3)3 and 1L of .004 M CaCl2. Which one is going to precipitate first,
if 100.0 grams of copper cu completely reacts with 25.0 grams of oxygen how much copperii oxide cuo will form from
Strontium-90 is one of the products of the fission of uranium-235. This strontium isotope is radioactive, with a half-life of 28.1 yr.
In a Grignard synthesis of triphenylmethanol experiment give two reasons why anhydrous conditions must be maintained during a Grignard synthesis and be sure to use chemical reactions to explain why
We wish to lower the freezing point of the water in an automobile radiator to -40 °C. The total mass of water present is 12.0 kg. For which one of the following compounds would we have to use the greatest mass of solute to achieve this
as 3.6g soil sample was treated with hclo4 and hf was distilled from the mixture. the hf distillate was then diluted to
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