In which of the following compounds is the oxidation number of nitrogen different from the other three
a: no3
b: n205
c: nh4cl
d: ca(n03)2

Chemical energy is a form of energy. a. heat b. kinetic c. potential d. electromagnetic

The star betelgeuse is about 600 light-years away. if it explodes tonight, a. we'll know because debris from the explosion will rain down on us from space. b. we'll know it immediately because it will be brighter than the full moon in the sky. c. we won't know about it until 600 years from now. d. none of the above.

14. a body is projected with velocity vi from a. at the same time another body is projectedvertically upwards from point b withvelocity v2 lies vertically below the highestpoint. both the bodies collide thenv2÷v1is