Star a has a magnitude of 2. star b has a magnitude of 5. what is the brightness ratio? a.6.3 : 1 b.15.8 : 1 c.5 : 2 d.2 : 5

Which compound contains both ionic and covalent bonds? a) hbr b)cbr4 c)nabr d) naoh

What is a property of a double replacement reaction

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.