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H-NMR has chemical shifts between +12 to -4. Explain what does having chemical shifts in the negative region mean?
What is the vapor pressure of SiCl4 (in mm Hg) at 23.5 C? The vapor pressure of SiCl4 is 100 mm Hg at 5.4 C and Delta H
what is the percent yield of CCl4 if 719 kg is produces from the reaction of 410. kg of CS2
The radioisotope argon-41 is used to measure the rate of the flow of gases from smokestacks. It is a γ emitter with a half-life of 109.2 minutes. Calculate the fraction of an argon-41 sample that remains after one day.
Rank the following aqueous solutions in order of increasing boiling point: 0.10 mNa2SO4, 0.10 m SrSO4, 0.25 m sucrose, 0.20 m glucose, 0.15 m NaCl
A gaseous compound containing hydrogen and carbon is decomposed and found to contain 85.63% C and 14.37% H by mass. The mass of 258 mL of the gas, measured at STP, is found to be 0.646 g. What is the molecular formula of the compound?
A copper tube is 1 inch in diameter and 2 feet long, it is filled with steel balls of 1 inch diameter. The space between the balls is filled with water. the specific gravity of the steel b all is 7.8. What is the bulk denisty of the contents of th..
a student was asked to determine the percentage of the components of a mixture of potassium bromide kbr magnesium
A buffer solution contains 0.386 M NH4Cl and 0.316 M NH3 (ammonia). Determine the pH change when 0.064 mol HBr is added to 1.00 L of the buffer
calculate the attractive bonding forces between the different ions, (2) compare qualitative curves of bond energy vs. ion separation distance for the two compounds
Calculate the standard enthalpy of the reaction, \Delta {{H}^\circ}_{\rm rxn}, for the thermite reaction: \rm 2Al(s) + Fe_2O_3(s) \rightarrow 2Fe(s) + Al_2O_3(s)
In the confirmation test that you performed for silver (I) ion, addition of nitric acid, HNO3, to a solution containing Ag+ produced the precipitate AgCl. Where did the chloride ion come from
assuming no energy is transferred to or from the surroundings, calculate the final temperature of the water after all the ice melts heat capacity(s) 37.7 jmolk
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