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Quantized Energy and Photons (Section)One type of sunburn

Chemistry: The Central Science | 12th Edition | ISBN: 9780321696724 | Authors: Theodore E. Brown; H. Eugene LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward ISBN: 9780321696724 27

Solution for problem 27E Chapter 6

Chemistry: The Central Science | 12th Edition

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Chemistry: The Central Science | 12th Edition | ISBN: 9780321696724 | Authors: Theodore E. Brown; H. Eugene LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward

Chemistry: The Central Science | 12th Edition

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Problem 27E

Problem 27E

Quantized Energy and Photons (Section)

One type of sunburn occurs on exposure to UV light of wavelength in the vicinity of 325 nm.

(a) What is the energy of a photon of this wavelength?

(b) What is the energy of a mole of these photons?

(c) How many photons are in a 1.00 mJ burst of this radiation?

(d) These UV photons can break chemical bonds in your skin to cause sunburn—a form of radiation damage. If the 325-nm radiation provides exactly the energy to break an average chemical bond in the skin, estimate the average energy of these bonds in kJ/mol.

Step-by-Step Solution:
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Chapter 19: Our Galaxy  The Milky Way Revealed o What does our galaxy look like  Dusty and gas obscure our view of the galaxy.  Looks like a disk  100,000 light-years in diameter  Bulge in the middle  Globular Clusters in the halo o Halo is outside the disk  Has spiral arms: different color from bulge o Blueish: bigger, younger stars  Barred Spiral  The bulge is elongated like a bar is in it. o How do stars orbit in our galaxy  Stars in the disk travel in circles with little up and down motions  Halo stars go above the disk randomly  Bulge stars move in random paths  We have a 230 million-year orbit  Orbital Velocity Law  The orbital speed and radius of an object on a circular orbit around the galaxy tells us the mass within that orbit.  Galactic Recycling o How is gas recycled in our galaxy  Star-Gas-Star Cycle n o Wh er dIonization nebulae are found around short-lived high-mass stars  Shows star activity  None in halo, or bugle o No stars being formed  Reflection nebulae scatters the light from stars  Spiral Arms of the galaxy is where most of the star formation takes place  History of the Milky Way o What clues to our galaxy’s history do halo stars hold  Halo Stars are older than our galaxy  Formed first then stopped o Giant cloud makes the halo stars are it contracts.  Center of our galaxy o What lies in the center of our galaxy  Lots of stars orbit around it  We believe it is a black hole  Lots of mass  Invisible  Small Region  See X-ray bursts, but no accretion disk l

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Chapter 6, Problem 27E is Solved
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Textbook: Chemistry: The Central Science
Edition: 12
Author: Theodore E. Brown; H. Eugene LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward
ISBN: 9780321696724

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Quantized Energy and Photons (Section)One type of sunburn