One can argue that both nitric oxide and sulfur dioxide are natural, and hence, harmless. Would you agree or disagree with this statement? Explain using the concept of equilibrium and biogeochemical cycles, and discuss their effects on natural waters.
In: Chemistry
Describe how you would design the experiment, what you would measure, and how you could determine the specific heat capacity of water.
In: Chemistry
For a solution of Ni2+ and ethylenediamine, the following equilibrium constants apply at 20° C: Ni2+ + H2NCH2CH2NH2 <-> Ni(en)2+ log K1 = 7.52 Ni(en)2+ + en <-> Ni(en)22+ log K2 = 6.32 Ni(en)22+ + en <-> Ni(en)32+ log K2 = 4.49 Calculate the concentration of free Ni2+ in a solution prepared by mixing 0.100 mol of en plus 1.00 mL of 0.010 M Ni2+ and diluting to 1.00 L with dilute base (which keeps all the en in its unprotonated form. [Hint: Assume that nearly all the Ni is in the form Ni(en)32+ (i.e., [Ni(en)32+] = 1.00 x 10-5 M).] You will need to calculate the concentrations of Ni(en)2+ and Ni(en)22+ to verify the assumption does not lead to a contradiction.
In: Chemistry
a. Compare the interactions of protons/alpha particles to electrons with absorber materials? What properties are factors in slowing down and ultimately stopping these particles?
b. Do you expect neutrons to slow down as a result of the same interactions? What type of material do you think could be used to slow down a neutron? Why? Hint: In a nuclear reactor, neutrons produced in the fuel are slowed down in the water. Think about why water is effective at slowing down the neutrons.
In: Chemistry
In: Chemistry
In: Chemistry
How many lysine residues become aldehydes in the Schiff base crosslink?
How many hydrogen atoms are on a proline nitrogen atom at pH = 7 when the proline nitrogen forms a pepetde bond with another amino acid?
What fraction of the amino acids in the collagen peptide are glycine?
In: Chemistry
Calculate the pH of a polyprotic acid give and sketch the titration curve for the following reaction: A 10.0-mL aliquot of 0.100M Na3AsO4 titrated with 0.100M HCl. pK1 = 2.25, pK2 = 6.77, pK3 = 11.60.
In: Chemistry
In: Chemistry
The differential for the Internal energy, U, at constant
composition is
?U = −P?V + T?S
(a) What are the natural independent variables of U? [2]
(b) Derive an expression for the change in internal energy at
constant Volume starting with the
above differential for the internal function, U, at constant
composition. [3]
(c) Using the criterion for exact differentials, write the Maxwell
relation that is derived from this
equation. [2]
(d) Based on your answer in part (a), write the total differential
of U in terms of partial
differentials. [2]
(e) By comparison of the above equation (equation at the beginning
of the question) and the total
differential of U written in part (d), obtain appropriate
expressions (partial differentials) for −P
and T.
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Saccharin, an artificial sweetener that is 300 times sweeter than sugar, is composed of 45.9% carbon, 2.73% hydrogen, 26.23% oxygen, 7.65% nitrogen, and 17.49% sulfur. Each packet of Sweet
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The reaction SO2Cl21g2 ¡ SO21g2 Cl21g2 is first
order
in SO2Cl2. Using the following kinetic data, determine the
magnitude and units of the first-order rate constant:
Time Pressure
0 1.000
2500 0.947
5000 0.895
7500 0.848
10000 0.803
k=
In: Chemistry
In the laboratory a student combines 49.7 mL of
a 0.133 M magnesium iodide
solution with 28.0 mL of a 0.562
M nickel(II) iodide solution.
What is the final concentration of iodide anion
?
___ M
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Write in brief about the side effects of using (Benzoic Acid) as
preservative.....?
Which additive does convert (Sodium Benzoate) to (Benzene) in human
body?
Explain briefly, Why (Benzoic Acid) cannot be dissolved in water?
In: Chemistry
Calculate the enthalpy change for the reaction below given the standard heat of combustion for ammonia, NH3, is -226 kJ/mol. 4NH3 (g) + 5O2(g) --> 4NO(g) + 6H2O(g)
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