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The human eye contains a molecule called 11- cis -retinal

Chemistry: A Molecular Approach | 3rd Edition | ISBN: 9780321809247 | Authors: Nivaldo J. Tro ISBN: 9780321809247 1

Solution for problem 74E Chapter 7

Chemistry: A Molecular Approach | 3rd Edition

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Chemistry: A Molecular Approach | 3rd Edition | ISBN: 9780321809247 | Authors: Nivaldo J. Tro

Chemistry: A Molecular Approach | 3rd Edition

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Problem 74E

Problem 74E

The human eye contains a molecule called 11- cis -retinal that changes shape when struck with light of sufficient energy. The change in shape triggers a series of events that results in an electrical signal being sent to the brain. The minimum energy required to change the conformation of 11- cis -retinal within the eye is about 164 kJ/mol. Calculate the longest wavelength visible to the human eye.

Step-by-Step Solution:

Step 1 Elemental Astatine exists only in very tiny quantities and generally for a very short period of time due to its short half-life. Hence the bulk properties of Astatine are not known with certainity.The properties are estimated based on its periodic table position as a heavier analog of iodine and as a member of the halogen family. The general trend in state for halogens is as given below Halogen Family F(gas) Cl(gas) Br(liquid ) I(solid) At(solid) Hence there is a trend in state from gas to liquid to solid down the group. So Astatine is expected to be a solid

Step 2 of 3

Chapter 7, Problem 74E is Solved
Step 3 of 3

Textbook: Chemistry: A Molecular Approach
Edition: 3
Author: Nivaldo J. Tro
ISBN: 9780321809247

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The human eye contains a molecule called 11- cis -retinal