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(a) Which ion is smaller, Co3+ or Co4+?
(b) In a lithium ion battery that is discharging to power a device, for every Li+ that inserts into the lithium cobalt oxide electrode, a Co4+ ion must be reduced to a Co3+ ion in order to balance charge. Using the CRC Handbook of Chemistry and Physics or other standard reference, find the ionic radii of Li+, Co3+, and Co4+. Order these ions from smallest to largest.
(c) Will the lithium cobalt electrode expand or contract as lithium ions are inserted?
(d) Lithium is not nearly as abundant as sodium. If sodium ion batteries were developed that function as lithium ion ones, do you think "sodium cobalt oxide" would still work as the electrode material? Explain.
(e) If you don't think cobalt would work as the redox-active partner ion in the sodium version of the electrode, suggest an alternative metal ion and explain your reasoning.
The two naturally occurring isotopes of copper are 63 CU, mass 62.9298 , and 65 C, mass 64.9278 u. The percent natural abundances of the two isotopes are (Atomic Mass of .546 u) 69.16 and 30.84 b. 45.16 and 5484 c. 81.85 and18.15 d.75.12 and..
While 111g of 2-methyl-2-propanol was heated with phosphoric acid, a colorless gas evolved. This gas was passed through a CCl4 solution containing 0.16 g Br2 per mL solution. Exactly 1.0 L ofthe solution was discolored by the gas generated in ther..
While 1,3-cyclohexanone is heated in presence of Br2 in surplus in a basic solution, two organic products are observed: 1,5-pentanedioic acid and CHBr3. Explicate these results as well as show the mechanism.
The CO2 output of an astronaut is about 1.3 kg/day. What is the minimum mass of LiOH required for a six-day space shuttle flight involving five astronauts?
Using an Erlenmeyer flask with 2ml of water instead of 50ml, would it make the experimental molarity higher, lower or no change compared to the actual valve?
An aqueous antifreeze solution is 40.0% ethylene glycol (C2H6O2) by mass. The density of the solution is 1.05 g/cm3. Calculate the molality, molarity, and mole fraction of the ethylene glycol.
What is the silver ion concentration in a solution prepared by mixing 353 ml of .357 M silver nitrate with 425 ml of .494 M sodium carbonate?
The rate constant for a first-order reaction is 5.50 x 10-4 s-1 at 39oC and 2.32 x 10-3 s-1 at 56oC. What is the activation energy
Light with a frequency of 7.11 x 10 -14 Hz lies in the violet region of the visible spectrum. What is the wavelength of this frequency of light? Answer in units of nm.
A hot-air balloon has a volume of 875L . What is the original temperature of the balloon if its volume changes to 955L when heated to 56 degrees celsius
The balanced equation for the reaction of aqueous Pb(ClO3)2 with aqueous NaI is shown below.Pb(ClO3)2 (aq) + 2NaI (aq) -> PbI2 (s) + 2NaClO3 (aq)
a 65.0 g sample of zinc specific heat 0.0922 calg x deg c was cooled from 100.0 deg. c to 29.4 deg. c in a calorimeter
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