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write Lewis structure for Oxygen difluoride, OF2. How many lone pairs are one the oxygen atom
Determine the error in the molar mass of Mg(ClO4)2. If 0.982(+/- 0.002)g is dissolved in a 250 mL (+/-0.08 mL) volumetric flask and water added to the mark, what is the concentration and error in the concentration of ClO4-?
Under these conditions, the half-life of the reaction has been estimated to be 6.4 103 min. What would the half-life be if the initial concentration of NO were 13 ppm?
Human and chameleon insulins have the same amino acid sequence, with the exception of six amino acids, as shown below. Is the pI of human insulin lower, higher, or the same as that of chameleon insulin?
Galvanized nails are iron nails that have been plated with zinc to prevent rusting. The relevant reaction is Zn2+(aq)+2e??Zn(s)
The ester ethyl p-nitrobenzoate is more reactive towards nucleophilic acyl substitution than ethyl p-methyoxybenzoate. Explain the reactivity difference
If a bottle of nail polish remover contains 176 mL of acetone, how much heat would be released by its complete combustion? The density of acetone is 0.788g/mL.
the recrystallization is slow typically the flask is closed with a cork. What do you think is the reason for using a cork and not a plastic stopper (which would seal the flask better)
Methane gas (CH4) comprises 7 x 10-5 % by mass of the Earth's atmosphere. What is the residence time of the gas in the atmosphere if it is being lost to the methane sinks at the rate of 4 x 1011 kg yr-1.
A student creates a coffee cup calorimeter for lab. The coffee cup contains 30 mL of water at a temperature of 55.5 °F. He then adds 65.4mL of water, at 165.5 °F, into the coffee cup. The final temperature of the coffee cup is 120.3 °F.
Calculate the heat energy released when 13.3 g of liquid mercury at 25.00 C is converted to solid mercury at its melting point. Constants for mercury at 1 atm
An ionic compound forms when aluminum (Z = 13) reacts with iodine (Z = 53). If a sample of the compound contains 1.23 x 1019 aluminum ions.
How long would it take for 1.50 mol of water at 100.0 0C to be converted completely into steam if heat were added at a constant rate of 15.0 J/s?
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