Examlex
What element is the most abundant in the Earth's crust by weight?
Geometric Isomers
Molecules with the same molecular formula and sequence of bonded atoms (constitution), but differing in the three-dimensional orientations of their atoms in space.
(E)-2-pentene
An alkene with the formula CH3CH=CHCH2CH3 where the two substituents on the double bond are on opposite sides, denoted by the (E) configuration.
(Z)-2-pentene
An alkene with the chemical formula C5H10, where the double bond between carbons 2 and 3 has the highest priority substituents on the same side, following the Cahn-Ingold-Prelog priority rules.
Stereoisomers
Compounds sharing identical molecular formulas and sequences of bonded atoms, yet varying in the spatial arrangement of their atoms.
Q14: Desert and steppe lands cover about what
Q16: Which kind of volcanism is typical of
Q18: _is a gently rolling sheet of till
Q20: Sandstones are lithified mainly by cementation. What
Q39: Where would you expect to find the
Q56: What is the most abundant type of
Q70: What kind of material is most commonly
Q72: Briefly give two reasons why, among all
Q74: During the maximum extent of the last
Q98: Shales are distinguished from other mudrocks by