Answer:
The answer is supposed to be "Electron cloud" or "Electon".
Total change in energy = Heat produced by system + work done on the system
= 228 - 55
= 173 kJ
Because this energy is released as heat, the reaction is exothermic.
They usually form covalent bonds! When two non-metals bond they are covalent an example is a diamond formed by double carbon atoms!
A combustion reaction is a reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat. Combustion reactions must involve \(\ce{O_2}\) as one reactant. The combustion of hydrogen gas produces water vapor. Notice that this reaction also qualifies as a combination reaction.
I looked this up but hope it helps
