The body obtains vitamin A in two ways. One is by manufacturing it from carotene, a vitamin precursor found in such vegetables as carrots, broccoli, squash, spinach, kale, and sweet potatoes.The other is by absorbing ready-made vitamin A from plant-eating organisms.he body obtains vitamin A in two ways. One is by manufacturing it from carotene, a vitamin precursor found in such vegetables as carrots, broccoli, squash, spinach, kale, and sweet potatoes.
A catalyst is like adding a bit of magic to a chemical reaction. Reactions need a certain amount of energy in order to happen. If they don't have it, oh well, the reaction probably can't happen. A catalyst lowers the amount of energy needed so that a reaction can happen more easily. A catalyst is all about energy.
X, x=1,2,3) and carbon monoxide (CO) from the combustion residues before they are released into the environment. It is called a catalytic converter because it converts CO into ubiquitous CO 2 and NO X into N 2 and O 2 through chemical reactions on a solid catalyst.A catalyst is a chemical compound that helps the reaction to occur faster by reducing the activation energy barrier of the reaction.n the case of the catcon, the catalyst is a solid platinum (Pt) or palladium (Pd)surface unto which reactants from the gaseous phase adsorb and react. This process of a reaction being assisted by a catalyst that is in a phase different from the reactants phase is known as heterogeneous catalysis.