1)
What is "Tachol"?
1.
Rashi: It is an expression of penetration.
2.
Radak: This is like "Chil ka'Yoledah" (6:24, i.e. trembling).
2)
Why does it say "Kamah" (singular)? "Machshevos" is plural!
1.
Radak: Every thought that He had about them will be fulfilled.