Ch.10 - Molecular Shapes & Valence Bond TheoryWorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Solution: The molecule 2-butene, C4 H8, can undergo a geometric change called cis-trans isomerization: As discussed in the "Chemistry and Life" box on the chemistry of vision, such transformations can be ind

Problem

The molecule 2-butene, C4 H8, can undergo a geometric change called cis-trans isomerization: The structure of cis-2-butene is two Cs double bonded together.  Each C is single bonded below, angled outward, to H, and above, angled outward, to CH3. The structure of trans-2-butene is two Cs double bonded together.  The left C is single bounded below, angled out, to H, and above, angled out, to CH3.  The right C is single bounded below, angled out, to CH3, and above, angled out, to H. As discussed in the "Chemistry and Life" box on the chemistry of vision, such transformations can be induced by light and are the key to human vision.

What is the longest wavelength of light that will provide photons of sufficient energy to break the C-C-C bond and cause the isomerization?