Why Have No Rocks Older Than 4

question 5

Essay

Why have no rocks older than 4.03 Ga been found in the Earth's crust?

Understand the significance and outcomes of Andrew Johnson's impeachment.

Assess the achievements and limitations of Reconstruction policy reforms.

Recognize the goals and achievements of Radical Republicans during Reconstruction.

Appreciate the role and implications of the Civil Rights Bill of 1866.

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Definitions:

Activation Energies

The minimum amount of energy required to initiate a chemical reaction.

Antibonding π Molecular Orbital

A molecular orbital formed when lobes of p orbitals on two atoms combine in a phase mismatch, weakening the bond between the atoms.

Allyl Cation

A positively charged species (ion), specifically a reactive intermediate with the structure CH2=CH-CH2+.

LUMO

The Lowest Unoccupied Molecular Orbital, which is the lowest energy orbital that can accept electrons.