What is the purpose of a chemical equation and why it must be

The modern periodic table has groups.

In 1901, thomas edison invented the nickel-iron battery. the following reaction takes place in the battery. fe(s) + 2 nio(oh)(s) + 2 h2o(l) fe(oh)2(s) + 2 ni(oh)2(aq) how many mole of fe(oh)2, is produced when 4.20 mol fe and 6.70 mol nio(oh) react?

If you had to research a particular disease or area of concern in veterinary medicine and science, which one would you choose? why?