Consider the half reaction below. which statement best describes what is taking place in this half reaction?

a. iron is being reduced.
b. iron is being oxidized.
c. iron is gaining electrons.
d. iron is an oxidizing agent.

Iron is being oxidized. (Ans. B)

Explanation:

Half reaction is defined as either the reduction where electrons are gained or oxidation where electrons are lost of the redox reaction. Half reaction is produced by change in the oxidation state of individual molecule which is involved in the redox reaction.

A good example of redox reaction is known as rusting. In this process oxygen take electrons from iron, then iron gets oxidized, and oxygen gets reduced. This process results the compound known as rust, or iron oxide.

Fe> Fe2+ +2e-.

it takes on an electronical energy

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.