Sodium phosphate is added to a solution that contains 0.0030 m aluminum nitrate and 0.016 m calcium chloride. the concentration of the first ion to precipitate (either al3+ or ca2+) decreases as its precipitate forms. what is the concentration of this ion when the second ion begins to precipitate?

The drawing represents the movement of particles in a substance. what changes of state can this substance undergo

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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.