Provide the structure of L-valine at pH 12.0.

What elements are present, and how many atoms of each are in the compound Fe₂O₃?

A) 2 atoms of iron and 3 atoms of oxygen
B) 2 atoms of fluorine and 3 atoms of oxygen
C) 3 atoms of iron and 2 atoms of oxygen
D) 3 atoms of fluorine and two atoms of oxygen

Which of the following elements is necessary for the vulcanization of rubber?

A) sulfur
B) silicon
C) phosphorus
D) boron
E) titanium

Provide the IUPAC name for the compound shown below.