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Nitrogen is fixed in ecosystems in ways declared below. State which one of the statements below is false?
A. By cyanobacteria
B. By electrical discharges in the atmosphere
C. By industrially synthesised fertilizer
D. By denitrification
The normal boiling and freezing points of substance X are 87.3 K and 84.0 K respectively. The triple point is at 82.7 K and 0.68 atmosphere. a. Draw a phase diagram for substance X. Label the regions in which the s,l, and g phases are stable.
Draw the molecule by placing atoms on the grid and connecting them with bonds. If there is more than one answer, draw all o
An insulated tank is divided into two equal parts. Both halves contain the same ideal gas but one is at 300K and 2 bar while the other one is at 1 bar.
A student tried to detect the presence of calcium ion in milk by adding Na2SO4 solution to a sample of milk. What is the likely results of her experiment? What would she observe. Would she be able to detect Calcium ion
Determine the boiling point of water under pressure of 0.5 bar, given that the standard boiling point is 373 K as well as enthalpy of vaporization is 40.7 kJ/mol.
An unknown compound, H2A, is thought to have a carboxyl group with a pKa value of 3.2 and another ionizable group with a pKa between 4 and 9. When 75mL of 0.1M NaOH was added to 100mL of a 0.1M solution of H2A at pH 3.2
the mechanism to convert 9-fluorenol to 9-methoxy fluorene using a nucleophilic substitution reaction with H2SO4 and methanol.
A certain sample of the mineral galena weighs 12.4 and has a volume of 1.64 mL. What is the density of galena?
diethyl either is 34.5C and its latent heat of vaporization is 6.38 kcal/mol. Calculate its vapor pressure
If Ka is 1.85 x 10-5 for acetic acid, what is the pH of the solution at the equivalence point during a titration of 50.0 mL of 0.100 M acetic acid with 0.100 M NaOH
Just transfer this solution completely to a flask of 1L volumetric and dilute to exactly 1 liter and then compute the Fe 2+ ion concentration.
explain why pure water does not conduct electricity and what happens when a strong electrolyte is dissolved in it
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