It is possible that the solid aluminum hydroxide will not all dissolve when additional sulfuric acid is added during the third reaction of the alum crystal synthesis, in which case you should heat the solution. why is this done?

Explanation:

Aluminium Hydroxide is amphoteric ( compound that can react with both acid and base)  in nature, hence it is possible that on addition of H2SO4, it will not form the white precipitate of Al2(SO4)3. In order to obtain the desired reaction, we need to heat the solution, which will lead in the disintegration of compounds into ions at rapid rate, leading to the formation of Aluminium Sulphate or Al2(SO4)3.

they emit helium gas that attaches to nearby planets.

they remove low-mass elements from the planets’ crust.

they cause nuclear fusion inside the inner core of planets.

they produce heavy elements such as iron and gold.

explanation:

zfoods? ok, pressure is used to keep the heat inside and to keep the food perfect.