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A 50.0 mg sample of an unknown radioactive substance was placed in storage and its mass measured periodically. After 70.6 days, the amount of radioactive substance had decreased to 3.13 mg. What is the half-life of the unknown radioactive substance?
0.0200 mole of HCl and 0/0200 mole of NaOH react in an open calorimeter and produce 100 J of heat what is the enthalpy of the reaction per mole of HCl
A gaseous sample of this element is bombarded by photons of various energies (in these same units). Match each photon to the result of its absorption
You have 277 mL of 1.25M potassium chloride solution, but you need to make a 0.50M potassium chloride solution. how many mL of water must you add to the original 1.25M solution to make the 0.50M potassium chloride solutuion
What would happen to the A450 value for a smaple which include : 1mL of 0.0025M Fe(NO3)3 + 1mL of 0.0025M KSCN + 5.0mL of 0.1M HNO3 , if you accidentally added 5 drops of disodium hydrogen phosphate
determine the ph of 0.25 m hno2 nitrous acid solution it is given that ka4.5 x 10-4?determine the molecular formula of
If it takes 1.0 gram of solid NaOH (a strong base) to change the pH of a solution containing a strong acid from 1 to 2, how much solid NaOH (in g) would be needed to change the pH of this solution from 2 to 3? You may assume that there is no chang..
The compound dichlororodifluoromethane (CCl2F2) has a normal boiling point of-30C, a critical temperature of 112C, as well as a corresponding critical temperature of 40 atm. If the gas is compressed to 18atm at 20C, will the gas condense. Why if s..
What is the structure of the so-called Garner Aldehyde? Why is this compound a popular building block in the synthesis of more complex structures
Her teacher suggested her to adding a few drops of 0.1 M HCl to the enzyme solution, which then effectively inhibited the enzyme. Why would the slight acidity make such a big difference. Hint- consider where trypsin is found in nature.
Explain which of the following aqueous solutions has the strongest ion-dipole attractions: 0.3 M FeBr3, 0.6 M CaCl2, 0.5 M Ba(NO3)2, 0.2 M (NH4)2SO4, 0.9 M KOH
Ammonia reacts with oxygen according tot he following equation: 4NH3+5O2=4NO+6H2O deltaHrxn = -906kJ Calculate the heat (in kJ) associated with the complete reaction of 155g of NH3.
what weight of a can be removed from a soluton that contains 6.00 grams of a in 50.0-mls of water by a single
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