A student tests the emission spectra of various known substances and an unknown substance. Which statement is a qualitative observation of the tests? A. Two emission lines were seen in the spectra between 400 and 500 nm.

B. The unknown substance contains barium ions.

C. Sodium produces a yellow flame when heated.

D. Nitrate ions have no effect on the color emission.

PLEASE HELP ME

Will give brainliest! which statement best describes the similarities between fundamental forces? electromagnetic and strong nuclear forces influence the interaction between charged particles within an atom. gravitational and magnetic forces are both types of charges that occur in nature. nuclear and magnetic forces are both related to mass and weight. strong nuclear force is most like electrical force because they are both related to distance.

Anybody wanna ? (picture included? )

Your town is considering building a biodiesel power plant describe at least two advantages and two disadvantages