Agroup of scientists wants to determine whether cell phones cause cancer. which of the following would best them answer this question?

a. an experiment
b. an investigation
c. a descriptive study
d. an observational study

idk if this is chemistry or not, but i couldn't find anything
just having a hard time understanding this

Which factor is likely to impact the possible number of compounds ?

Describe the forces both attractive and repulsive that occur as two atoms move closer together.

Determine the number of moles of air present in 1.35 l at 750 torr and 17.0°c. which equation should you use? n=pv/rt what is the number of moles present? ⇒ 0.056 mol a sample of n2 gas occupying 800.0 ml at 20.0°c is chilled on ice to 0.00°c. if the pressure also drops from 1.50 atm to 1.20 atm, what is the final volume of the gas? which equation should you use? v2= p1v1t2/p2t1 what is the final volume of the gas? ⇒ 932 ml these are the answers