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The rays of the Sun that cause tanning and burning are in the ultraviolet portion of the electromagnetic spectrum. These rays are categorized by wavelength: So-called UV-A radiation has wavelengths in the range of 320-380 nm, whereas UV-B radiation has wavelengths in the range of 290-320 nm.
Part A: Calculate the frequency of light that has a wavelength of 335 nm.
Part B: Calculate the energy of a mole of 335-nm photons.
Part C: Which are more energetic, photons of UV-A radiation or photons of UV-B radiation?
Part D: The UV-B radiation from the Sun is considered a greater cause of sunburn in humans than is UV-A radiation. Is this observation consistent with your answer to part (c)?
The reaction below has a Kc value of 1.0 × 1012. What is the value of Kp for this reaction at 500 K. 2 SO2(g) + O2(g) 2 SO3(g)
Problem- What is the proton concenteration in a solution of 102.7 mM acetic acid (this concentration represents the sum of both the acetic acid and the deprotonated acetate) at pH 5.77 if the pKa of acetic acid is 4.76? Report your answer in micro..
Are there ionic bonds, covalent bonds, or both present. Explain how many oxygen atoms are present per formula unit of this compound. Explain what is the mass percent of iron in this compound
Gold has a face-centered cubic structure and has a density of 19.3 g/cm3. What is its atomic radius
a 50 ml solution containing NaBr was treated with excess AgNo3 to precipitate 0.2146g of AgBr. what is the molarity of NaBr in the solution.
a 4.82-gram sample of a compound is dissolved in enough water to form 100.0 ml of solution. this solution has an
Calculate the new freezing point for a 0.61 m solution of CCl4 in benzene. 2) Calculate the increase in the boiling point, Î"T, for a 1.94 m solution of sucrose (dissolves as a molecule) in water
The accepted value for Ag2CrO4 is 1.1 x 10 -12. Compute the percent error in your experimentally determined value of Ksp: 4.9 x 10-10.
Complete the following equation that illustrates a Brønsted-Lowry acid/base reaction. Phases are optional.
Which element emits photons of highest energy? Of lowest energy? When burned, a sample of an unknown substance is found to emit light of frequency . 6.59 X 1014 s-1 Which of these elements is probably in the sample?
a toxicologist studying mustard gas sch2ch2cl2 a blistering agent prepares a mixture of 0.675 m scl2 and 0.973 m c2h4
Phosgene (COCl2) is a toxic substance that forms readily from carbon monoxide and chlorine at elevated temperatures: CO (g)+ Cl2 (g) ? COCl2 (g).
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