Yes, it is mandatory.
No, proteins can't absorb or lose heat without changing much in temperature. Water has a high heat capacity, so water can absorb or release a great deal of heat energy without changing much in temperature.
Vaporization absorb energy.
No, they release energy.
Yes, endergonic reactions absorb more energy than they release. These reactions require an input of energy in order to proceed, and the energy absorbed is greater than the energy released during the reaction.
It would release energy. It had to absorb it in order to get from 2 to 3. Law of conservation of energy says it must now release it to fall back.
Materials like water, sand, and concrete can absorb thermal energy due to their high heat capacity. Additionally, phase change materials (PCMs) can absorb and release large amounts of thermal energy during the process of changing phase, such as from solid to liquid.
Evaporation is an endothermic process, absorb energy.
Chemical reactions release or absorb heat based on whether they release or require energy to break or form bonds between atoms. Reactions that release heat are exothermic, as they release energy, while reactions that absorb heat are endothermic, as they require energy input.
Energy.
The process of ionization typically absorbs energy.
Yes, electrons release energy when they move to a lower energy level. When electrons absorb energy and move to a higher energy level, they are in an excited state. When they return to a lower energy level, they release energy in the form of light or heat.
Exoergic is energy-releasing. Endoergic occurs with an absorption of energy. Isoergic does not release or absorb energy.