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The barrier to rotation about the C-C bond in bromoethane is 15kJ/mol (3.6kcal/mol).
(a) What energy value can you assign to an H-Br eclipsing interaction?
(b) Construct a quantitative diagram of potential energy versus bond rotation for bromoethane.
The half-life for the first-order reacion of HCl with ethylene is 15.4 s when the initial concentration of HCl is 0.67 M. What is the rate constant for this reaction?
Describe the expected results of the following tests or reagents on the sphingolipid N-palmitoyl-D-sphingomyelin
Problem- What would the differences be between the IR spectras of 2-nitrophenol and 4-nitrophenol? What about the differences between their NMR spectras
Problem- Indicate whether the compounds below are strong electrolytes, weak electrolytes or non-electrolytes. For ionic species, indicate whether they are soluble.
Identify which of the following statements are incorrect. If the statement is incorrect, rewrite it to be correct. a. Reactions are faster at higher temperature because activation energies are lower.
For each parameter listed, explain whether or not a change in the parameter will have an effect on the retention time of a compound.
A student following the procedure in this experiment prepared three solutions by adding 11.50, 23.00, and 34.50 mL of a 7.60 x 10-2M NaOH solution to 50.00 mL of a .112M solution of a weak acide.
A 529-\rm mL sample of unknown \rm HCl solution reacts completely with \rm Na_2CO_3 to form 20.1g \rm CO_2. What was the concentration of the \rm HCl solution
Calculate the pH of a solution formed by mixing 250.0 mL of 0.15 M NH4Cl with 100.0 mL of 0.20 M NH3. The Kb for NH3 is 1.8 x 10-5.
Explain what are the concentrations of OH- as well as H+ in a 0.00066 M solution of Ba(OH)2 at 25C. Presume complete dissociation.
What mass of sodium cyanide must be added to 250ml of water in order to obtain a solution having a pH of 10.50? Ka(HCN) = 4.9 x 10 ^-10
calculate the mass of silver chloride agcl and dihydrogen monosulfide h2s formed when 85.6 g of silver sulfide ag2s
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