Carbon monoxide +oxygen _carbon dioxide is carbon dioxide in the chemical reaction formed from two elements ,two compounds and one element and one compound ??

Carbon monoxide +oxygen _carbon

Explanation:

CO+O2CO2

You can see here corbon monoxide as consist of one oxygen and one corbon element so it's a compound however see O2 its composed of two element or aton of oxygen so it's also a compound..

So corbon dioxide is consist of two compounds

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.