Astudent wants to determine whether an unknown solid is an ionic compound. he puts some in water and finds that it does not dissolve. he says that this proves the solid is ionic. which best evaluates the student's reasoning?

i think it’s a. this is because if they measured the mass of something with a mass of 150g, then their final answer would have to be approximately 150g. though all of their answers are almost 150, rosa and tran have the closest answers (or the exact answer) to the accurate one.

when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.