Determine the pH of a 0.010 M HNO3 solution. Is this an acid or a base?

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.

How many moles are in 43.9 l of oxygen

The empirical formula of a compound is ch2o and its mass is 120 amu/molecule, what is its formula?