1.

what statement describes the process of solar nuclear fusion?

hydrogen molecules are fused together and become oxygen molecules, giving off large amounts of energy.

helium molecules are fused together and become hydrogen molecules, giving off large amounts of energy.

hydrogen atoms are fused into deuterium, then helium-3, then helium-4, each step giving off large amounts of energy.

hydrogen atoms are fused into deuterium, then helium-4, then back into hydrogen, each step giving off large amounts of energy

Hydrogen atoms are fused into deuterium, then helium-3, then helium-4, each step giving off large amounts of energy.

Explanation:

Nuclear fusion refers to the process in which two lighter nuclei combine together to form one heavier nucleus. In the Sun, hydrogen atoms combine and form helium. This process releases large amounts of energy because the helium atom has less energy than the hydrogen atoms.

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.