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1) Why are there only 8 elements in period 2 and period 3?
2) Why are there 18 elements in period 4?
3) What do the elements in each group have in common?
4) A block is formed by the 28 elements set off at the bottom of the periodic table. What do these elements have in common?
If insulin were treated with mercaptoethanol to break its disulfide bonds, and then the mercaptoethanol were removed so that disulfide bonds could re-form, how many different wyas could the two polypeptide chains become linked to each other (assum..
What are the equilibrium partial pressures of CO(g) and CO2(g) when 2.32 atm CO(g) and excess FeO(s) react in a sealed container at 1000°C? PCO atm PCO2 atm
A mixture of 3.0 g of 1,1-diphenylethylene and 100 mg of sulfuric acid was heated for 2 hours. Upon cooling, 2.2 grams of crystalline 1,1,3,3-tetraphenyl-3-methyl-1-butene precipitated from the mixture. What is the percent yield of the crystalline..
a 20 year old male was brought to paramedics after ingesting 100mL of pure ethylene glycol which is a lethal dose. The hospital pharmacy is out of ehtanol so they use a bottle of 100-proof whiskey in your medical bag.
The vapor pressure of water at 45.0 degrees celcius is 71.93 mmHg. Calculate the vapor pressure of a solution of 1.50m K2CO3 at this temperature (assume 100% dissociation)
The bomb that destroyed the Murrah Federal Office building in Oklahoma City in April 1995 was constructed from ordinary materials: fertilizer(ammonium nitrate) and fuel oil
Assume a microwave oven operates at a frequency of 1.00x10^11 Hz. a) What is the wavelength of this radiation in meters. b) What is the energy in joules per photon. c) What is the energy per mole of photons.
apply to NHCl3. A. polar bonds B. nonpolar molecule C. triangular-planar molecule shape D. sp2 hybirdized
Aqueous solutions of 30% (by weight) hydrogen peroxide, H2O2, are used to oxidize metals or organic molecules in chemicals reactions. Given that the density of the solution is 1.11 g/mL, calculate the molality, molarity, and mole fraction.
Liquid octane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 9.1 g of octane is mixed with 22.7 g of oxygen.
Why is acetanilide more reactive than methyl benzoate in a competetive nitration
Calculate the mass of sodium hydroxide that must be added to 1.00 L of 1.00 M HC2H3O2 to double the pH of the solution (assume that the added NaOH does not change the volume of the solution). Ka of HC2H3O2 = 1.8 x 10 ^-5
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