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What is activation energy? What effect does an enzyme have on the required activation energy? How is oxygen produced during photosynthesis?
A 240L kiln is used for vitrifying ceramics. It is currently operating at 1025°C , and the pressure is 1.100atm . How many moles of air molecules are within the confines of the kiln?
How much energy is needed to warm 0.500 g of silver from 25.0 degree C to 27.5 degree C? The specific heat of silver is 0.24J /g. degree C
the uncatalyzed decomposition of hydrogen peroxoide is first order with an activation energy of 75.3 kj/mol and a half life of 6 hrs at 40 degrees celcius.
a proton in a linear accelerator has a de broglie wavelength of 138 pm. what is the speed of the
A particular reactant decomposes with a half-life of 171 s when its initial concentration is 0.329 M. The same reactant decomposes with a half-life of 245 s when its initial concentration is 0.230 M. determine the reaction order. calculate the rat..
Estimate the approximate concentration of a typical enzyme and the number of the enzyme molecules inside each cell. Make any reasonable assumption that will help you calculate the numbers
Nitrogen and oxygen gases react to form dinitrogen trioxide gas. 2 N2(g) + 3 O2(g) -> 2 N2O3(g) At a certain temperature and pressure 4.2 L of N2 reacts with 6.3 L of O2.
What are the first and second ionization energies of sodium. Compare this to the threshold energy from the photoelectric effect. What can you conclude
Chloroform, formerly used as an anaesthetic and now believed to be a carcinogen, has a heat of vaporizationΔHvaporization = 31.4 kJ mol-1.The change,CHCl3(l) CHCl3(g)hasΔSº = 94.2 J mol-1K-1.At what temperature do we expect CHCl3to boil (i.e., at wh..
Explain which of these compounds are soluble in water. For any that are, provide the ions that are released into solution
Determine how long will it take for a sample of N2O5 to decay to sixty percent of its initial value?
A solution is prepared by mixing 75.0 mL of 0.020 M BaCl2 and 125 mL of 0.040 M K2SO4. What are the concentrations of barium and sulfate ions in this solution. Assume only SO4^-2 ions (no HSO4-) are present
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