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How does a radioactive atom's half-life influence its effect on its environment? Why is it important for chemists to take this into account?
Calcium hydride reacts with water to form calcium hydroxide and hydrogen gas. How many grams of calcium hydride
Calculate the pH of a buffer solution that is 0.250 M in HCN and 0.170 M in KCN. For HCN, Ka = 4.9 x 10^-10 (pka = 9.31). Use the equilibirum approach to calculate
Determine the boiling point of a solution that contains 78.8 g of naphthalene (C10H8) dissolved in 722 mL of benzene (d = 0.877 g/mL). Pure benzene has a boiling point of 80.1°C and a boiling point elevation constant of 2.53°C/m.
A 2.78 L sample of hydrogen chloride (HCl) gas at 2.61 atm and 28°C is completely dissolved in 651 mL of water to form hydrochloric acid solution. Calculate the molarity of the acid solution. Assume no change in volume.
Chemical Structure and Hydrogen Bonds in Base Pairs, Draw the chemical structure of a correctly base paired G-C pair, then re-draw the pair with a propeller twist these answers should all be on one page following box G.
Which of the metals in the cymbal alloys might be able to be quantitatively measured using UV-vis spectrophotometry. Select one or more
Sulfamic acid is a primary standard that can be used to standardize NaOH. What is the molarity of a sodium hydroxide solution
Calculate the solubility of MnOH2 in grams per liter when buffered at pH=7.0 and pH=9.8 and pH=11.6
The pressure is steeply increased to 100 bar. The volume of the liquid is decreased by 1 ml at this constant pressure. Find the deltaH and deltaU
The Ksp of barium fluoride is 1.0 x 10^-6. The Ksp of calcium fluoride is 3.9 x 10^-11. What is the remaining concentration of the first ion to precipitate when the second ion begins to precipitate?
Calculate the energy in kJ required to convert 2.11 mol of sodium metal at 25 degrees celsius to 2.11 mol of gaseous Na+ ions. (Ionization energy of Na (g) is 495.9 kJ/mol.
It is heated so that its pressure increases from 1.50 atm to 407 atm. Determine the work done on the gas during this process.
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