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Problem- The molecules ChR2 (Ch = O, S, Se, Te) are all bent. How and why do the bond angles change when going down in the group 16?
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a sample of ringers solution contains the following concentractions meql of cations na 147 k 4 and ca2 4. if ci- is
Hydrochloric acid B) Ammonium Hydroxide 2) Identify the geometry of the iron(III) complex in water and the complex ions produced in the above reactions
Nitartion of ferrocene not possible why, Ferrocene cannot be nitrated using the conventional HNO3-H2SO4 mixed acid conditions, even though nitration is an electrophilic aromatic substitution reaction. Explain.
What are the pKa's of the 2 acidic protons of salicylic acid. Suggest a synthesis of methyl salicylate using phenol as a starting material.
A water skier is pulled by a net force of 135 N and has an acceleration of 1.8 m/s2. What is the mass of the skier.
A mixture is formed from 5.0 mol of liquid benzene and 5.0 mol of liquid toluene at 25 oC and 1 atm. Assume that the mixture is ideal. Use ?Gof (benzene,l) = 90.0 kJ/mol, ?Gof (toluene,l) = 100.0 kJ/mol,
Consider equimolar samples of the same ideal gas at the same temperature, but different volumes. Sample A has a larger volume than sample B. Compare the pressures. Compare the rms speeds. Compare the average kinetic energies.
Calculate the pH of a solution that results from mixing 19.5 mL of 0.145 M HCN(aq) with 22.1 mL of 0.108 M NaCN. The Ka value for HCN is 4.9 x 10-10.
An unknown oxide of mercury decomposes while heated to form mercury metal and oxygen gas. While a 1.048 g sample of this unknown is heated, 0.971 g of mercury remains. Compute the moles of mercury and moles of oxygen in the compound.
Determine the Ka of the ethylammonium ion (C2H5NH3+). [Kb of ethylamine (C2H5NH2) = 8.6 x10^-4]
Calculating the Equivalent Weight of an Unknown Substance, An unknown organic carboxylic acid, mp = 139-141 degrees Celsius, is burned with a yellow, sooty flame. The sodium fusion test showed that nitrogen was present.
What is the heat change of H 2 O If the final temperature of the mixture = 25 degree celsius?
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