The most common form of chemical energy is from coal and petrochemicals like diesel. It is combined with oxygen at height temperatures to create heat energy or kenetic energy and secondly, electrical energy.
I'm not expert, but I might say that other, better, energy sources were not around at the time when they choose there main energy source.
heat & electric energy !
your life will be less movement...
Because it is not constant.
It might get enough energy for its needs, or it might not.Note that this is the usual situation - there are usually other organisms, with which an organism has to compete.
hi
Four types of energy that might make up the internal energy of a substance are kinetic energy (due to movement of particles), potential energy (due to positions of particles in a field), chemical energy (due to chemical bonds), and thermal energy (due to temperature of the substance).
a cake anything cooked
Biomass
That means that humans might use solar energy instead of fossil fuel.
If you had a sufficiently cheap source of those two chemicals you might very well want to use them as an energy source, but as it is, you would use more energy to manufacture the HCl and the NaOH than you would get back by using them as an energy source.
Heavy water contains heavy hydrogen, i.e., deuterium. Once nuclear fusion is improved, it might become a viable energy source.