1)
What is the grammatical form of "v'Hachtati"?
1.
Radak: The root is Chasas (broken). The latter Ches is due to the conjugation; the Dagesh is in place of the latter Ches of the root, which is omitted.
2)
Why is Hashem angry at them?
1.
Radak: They harmed Yisrael.
