What can be safety concerns for investing chemical reaction? And what can we do to keep safe form them

Name some oscillating chemical reaction.

What is meant by the half reaction method? Question 2 options:

A) Oxidation and reduction in electrochemical reactions are split into two separate reactions.

B) One half of a reaction concerns only reactants and the other half of the reaction only concerns products.

C) The point at which half of the reaction is complete. It is analogous to half-life for electrochemical reactions.

D) It is the potential of an oxidation or reduction when all the reactants are at one molar concentration and standard temperature and pressure.

what can form as a result of a chemical reaction