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A 23.1 g sample of pure iron at 95°C is dropped into 78 g of water at 17°C. What is the final temperature of the water-iron mixture?
If 2 new elements have been discovered and one is R, a new element from the family with 3 valence electrons and Z, a new element from the family with 6 valence electrons. Write the formula for the binary compound between element R and element Z.
di ethyl ethal is a volatile, highly inflammable organic liquid that is used mainly as a solvebt. the vapour pressure of di ethyl ethal is 4.01mmHg at 18 degree celcius.
Given that the rate constant is 4.0×10-4 at 25.0 degrees C and that the rate constant is 2.6×10-3 at 42.4 degrees C, what is the activation energy in kilojoules per mole?
Small helium-neon lasers emit 3.50 mJ/s of light at 634 nm. How many photons does such a laser emit in one minute?
The most common source of copper (rm Cu) is the mineral chalcopyrite (rm CuFeS_2). How many kilograms of chalcopyrite must be mined to obtain 230. g of pure rm Cu?
How does the strength of the attration between water molecules and sodium and chloride ions compare with the strength of the attraction between the sodium ions and chloride ions?
One can safely assume that the 3s- and 3p-orbitals will form molecular orbitals similar to those formed when 2s- and 2p-orbitals interact. According to molecular orbital theory,
Draw the most stable conformation of trans-1-isobutyl-4-methylcyclohexane in both the chair conformation and the wedge structure.
By what factor (The factor is the ratio of the rates) does the rate of this isomerization reaction increase as the temperature increases from 256 degree celsius to 297 degree celsius ?
For organic chemistry, what is a concerted shift? how do things like acids or heat affect them? what other factors effect them?
What is the density of lead (in ) if a rectangular bar measuring 0.50 in height, 1.55 in width, and 25.00 in length has a mass of 219.5 ?
The pH in the stomach of a certain animal is 3.8. This means that the hydrogen ion concentration in the stomach
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