Which of the following is not a chemical equation involved in the process of carbonic acid forming and dissolving calcite? Question 12 options:

CO2 + H2O → H2CO3

H2CO3 → H + HCO3

HCl + OH → H2O + Cl

CaCO3 + H → Ca + HCO3

o conteúdo de calor de um sistema é igual à entalpia apenas para um sistema que é constante

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.