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Nitrogen obtained in the laboratory is collected over water. why?

Clyde and marilyn are riding a roller coaster. during which section(s) of the track is their potential energy converted to kinetic energy? a. from point b to point c only b. from point b to point d only c. from point a to point b only d. from point a to point b and from point c to point d

Chemistry worksheet - i am not sure what they are asking for exactly?

Why is retrograde motion an apparent motion