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Chromium metal can be produced from the high temperature reaction Cr2O3 [chromium ||| oxide ] with silicon or aluminum by each of the following reactions
Cr2O3 + 2 Al -> 2 Cr + Al2O3
2 Cr2O3 + 3Si -> 4 Cr + SiO2
Calculate the number of grams of aluminum required to prepare 327g of chromium metal by the first reaction
Calculate the number of grams of silicon required to prepare 327g of chromium metal by the second reaction
The electron configuration of carbon atom 1s^2 2s^2 2p^2. which of the following term symbols may not exist (^3S1 or ^1S0) explain
Explain why, during the recrystallization of p-dibromobenzene, the turbity of the hot solution was used as an indicator for the ratio of ethanol to water used.
Write equation for the reaction : Mg+H2SO4(diluted) Identify the oxidizing agent and the reducing agent.
Show the orbital-filling diagram for (nitrogen). Stack the subshells in order of energy, with the lowest-energy subshell at the bottom and the highest-energy subshell at the top.
one hundred grams of water is saturated with nh4clat 50 degrees c. according to table g if the temperature is lowered
A 250.0 mL sample of chlorine gas is collected when the barometric pressure is 798 mmHg. What is the volume of the sample after the barometric pressure dropped to 745 mmHg?
A piece of metal of mass 13 g at 103?C is placed in a calorimeter containing 53.5 g of water at 21 ?C. The ?nal temperature of the mixture is 57.2 ?C. What is the speci?c heat capacity of the metal.
What is the wavelength (in nm) of the line in the spectrum of the hydrogen atom that arises from the transition of the electron from the orbital with n =3 to the orbital
In the presence of Mn2+(aq), the reaction is first order in [Ce4+] and first order in [Mn2+]. Based on this which of the three steps in this mechanism is the rate limiting step. Why.
Calculate the equilibrium constant, Ka for the acid, HA if, at equilibrium, the pH of a 2.3 M solution of HA is 1.62
For the isoelectronic series[V(CO)6]-, Cr(CO)6, and [Mn(Co)6]+, does the energy of the metal to ligand charge-transfer bands increase or decrease with increasing charge on the complex? Why?
What is the pH of a solution obtained by mixing 50mL of 0.02 M sodium acetate with 40mL of 0.01 M HCl.
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