In science we frequently assume that some variables are not affecting our experiment. what are some good reasons for making assumptions?
a) the assumption variable has been tested previously by other scientists.
b) the assumption has been believed to not affect tests for over a decade.
c)the assumptive variable was tested separately from the experiment itself.
d)the assumption has been made by prominent scientists.

50 points! need answer asap. what type of organic compound contains the following functional group? (2 points)

What do electromagnetic waves carry? how are they produced through which media can they move? where do they transfer energy? what do they not transfer? what do mechanical waves carry? how are they produced? through which media can they move? where do they transfer energy? what do they not transfer?

A0.10 m aqueous solution of sodium sulfate is a better conductor of electricity than a 0.10 m aqueous solution of sodium chloride. which of the following best explains this observation? (a) sodium sulfate is more soluble in water than sodium chloride. (b) sodium sulfate has a higher molar mass than sodium chloride. (c) to prepare a given volume of 0.10 m solution, the mass of sodium sulfate needed is more than twice the mass of sodium chloride needed. (d) more moles of ions are present in a given volume of 0.10 m sodium sulfate than in the same volume of 0.10 m sodium chloride. (e) the degree of dissociation of sodium sulfate in solution is significantly greater than that of sodium chloride.