The absorbance features observed in the visible spectrum for curcumin is a result of an allowed optical excitation of an electron from the π-homo to the π*-lumo. what is the energy change for this electronic excitation based on the spectrum? (hint: energy and wavelength are related by the equation e = hc/λ.) h = 4.136 × 10-15 ev⋅ s

Write the formula for the following chemicals. 7. e. trinitrogen tetraoxide a calcium phosphate f. magnesium acetate b. potassium sulfide g nickel(iii) cyanide c carbon dioxide h. silver sulfate d. cobalt(ii) chloride

Americium-241 undergoes fission to produce three neutrons per fission event. if a neutron-absorbing material is mixed in with this sample so that the rate of neutron production drops down to 1.8 neutrons per fission event, which will be effective at achieving a critical mass? check all that apply. remove a deflective shield surrounding the sample. remove absorbent material mixed in with the sample. compress the sample of americium-241.

The biosphere of the earth is made up of what compound? organic or inorganic?