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A beta -emitting radiation source gives 250 units of radiation at a distance of 5.0m.At what distance does the radiation drop to one-tenth its original value?
One piece of copper jewelry at 108 degrees Celsius has exactly twice the mass of another piece, which is at 44 degrees Celsius. Both pieces are placed inside a calorimeter whose heat capacity is negligible. What is the final temperature inside the..
A 7.50 g piece of iron at 100 C is dropped into 25.0g of water at 22.0 C. Assuming that the heat is lost by the iron equals the heat gained by the water, determine the final temperature of the iron/water system. Assume a heat capacity of water 4.1..
why doen't the mass number decrease? (because there is one less neutron). But the atomic number increases due. What happens to the electrons?
Why do you think that being exposed to air can have an effect on the amount of vitamin C present in the sample of juice?
silica gel columns having smaller particle size procedure more effective chromatographic separations
The membrane has pores equivalent in size to a spherical molecule with a molecular weight (Mm) of 120,000 daltons. The protein solution consists of albumin (40 g/L at Mm = 69,000 daltons), globulins (70 g/L at MW = 150,000 daltons), and fibrinogen..
Consider the following overall reaction which is experimentally observed to be second order in AB and zero order in C: AB + C ----> A + BC Determine whether the mechanism below is valid for this reaction.
salicylic acid with methanol to yield methyl salicylate why wouldnt you use a strong base like sodium hydroxide?
A commercial plant is to treat 320 m3/hr of feed consisting of 50 % A, 50% inerts at 25 atm and 350ºC to obtain eighty percent conversion. Determine how many 2-m lengths of 2.5 cm ID pipe are required?
the Fischer esterification experiment why was the majority of the ethanol boiled off prior to extraction and why was the reaction vial cooled
Natural gas is a mixture of many substances, primarily CH4,C2H6,C3H8 and C4H10. Assuming that the total pressure of the gases is 1.34 atm and that their mole ratio is 94 : 4.0 : 1.5 : 0.50, calculate the partial pressure (in atmospheres) of each g..
What is the freezing point of a solution prepared from 50.0 g ethylene glycol (C2H6O2) and 85.0 g H2O? Kf of water is 1.86°C/m. A) 17.6°C B) -176°C C) -1.50°C D) 1.50°C E) -17.6°C
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