(science)

when a scientist conducts an investigation, which of the following is the first thing he or she should do?
a) design the experiment
b) make observations
c) identify the problem
d) form conclusions

Particles vibrate in a rigid structure and do not move relative to their neighbors.

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

Acetylene gas c2h2 undergoes combustion to produce carbon dioxide and water vapor how many grams of water are produced by the same amount of c2h2?