Consider the full set of reactions required to purify zinc metal. Step 1: ZnCO3 + heat → ZnO + CO2
Step 2: ZnO + C + heat → Zn + CO

How do the oxidation numbers of Zn and C change throughout these two reactions? Which compound is the oxidizing agent and which is the reducing agent in each step?

it is no longer used clinically

n has four pairs of electrons in the valence shell, electrons repel one another ,n has 7 protons in its nucleus, and since n has 7 protons, it must fill the second shell, giving it 4 pairs of electrons. the electrons form 3 bonds and 1 lone pair of electrons. each pair of electrons repels the other pairs, so they are equally far apart.

so all of the above

it takes on an electronical energy

answer: i have one answer

acids are substances that ionize (break off) in an aqueous solution to produce hydrogen (h+) ions

explanation:

hope this and sorry i could only come up with one answer!