A10.00 g sample of a soluble barium salt is treated with
an excess of sodium sulfate to precipitate 11.21 g baso4
(m = 233.4). which barium salt is it?
(a) bacl2 (m = 208.2)
(b) ba(o2ch)2 (m = 227.3)
(c) ba(no3)2 (m = 261.3)
(d) babr2 (m = 297.1)

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.

Which description best characterizes the motion of particles in a solid?

As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit