Describe the reactivity from the top to the bottom of group 0

Chen drew a diagram to compare the ways in which different organisms obtain nitrogen. which label belongs to the area marked z?

If you add 5.00 ml of 0.100 m sodium hydroxide to 50.0 ml of acetate buffer that is 0.100 m in both acetic acid and sodium acetate, what is the ph of the resulting solution? acetic acid: ka = 1.8. x 10-5

The identities of substances are the same before and after which type of change