When aqueous NH3, is first added to a solution containing Ni2 , a precipitate forms, but when an excess of aqueous NH3 is added, the precipitate dissolves. Which of the following best explains why the precipitate dissolves? a. Ni2+ forms hydrogen bonds with NH3
b. Ni2+ forms a complex ion with NH3
c. Ni2+ acts as a Bronsted-Lowry base.
d. Ni2+ is oxidized to Ni3+
e. Ni2+ is reduced to Ni+

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.

The msds for glacial acetic acid says that it is a flammable liquid that can severely burn any human tissue it comes in contact with. it reacts with bases, various metals, and strong oxidizing agents. its vapors can form explosive mixtures with air.

What is the effect of returning nuclear reactor cooling water back into bodies of water?