1)
What Ru'ach will Hashem put in the bones?
1.
Malbim: It is the small measure of basic Ru'ach of life, which was lacking from these bones. These Mesim were not proper for revival, due to their evil deeds. They had dried totally, like a dry tree that will not sprout again.
2)
When will Hashem put Ru'ach in the bones?
1.
Radak: It will be after they have flesh, skin and sinews, like it says below (8-10).
3)
What is the meaning of "vi'Chyisem"?