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Water
physical change
Sodium melts to form a silvery ball which moves about quickly on the water surface, producing hydrogen gas rapidly
The kinetic energy of the water molecules increases, causing the solid ice to melt into liquid water. During the process of melting, the water temperature remains constant. After all the ice has melted, and if heat energy continues to be absorbed, the temperature will increase.
Mechanical energy in the form of E= mgh, water falling, goes in and electrical enegy comes out.
Absorbed.
Water
When water molecules melt, energy is absorbed. When water molecules evaporate, energy is also absorbed. When water molecules condense energy is released. When water molecules freeze energy is also released.
The ice needs to absorb heat energy in order to melt. This energy is stored in the water as a type of potential energy (it requires a force, and therefore energy, to separate the water molecules). When the water freezes, this potential energy is returned once again.
released
Added. Heat is a form of energy. When heat is added to something frozen, it melts.
The arrangement of water molecules start having their chemical bonds break as ice melts. Hydrogen bonds constantly form and break constantly moving everything out of position.
Energy isn't "destroyed" and mass isn't "created" Basically mass is a "form" of energy. Much like ice is a "form" of water. So while one could, kinda, say "ice is destroyed when it melts into water" it isn't exactly true (even though it is no longer ice).
When ice melts the latent heat of fusion has to be supplied from the environment, which explains why ice takes a long time to melt, even when the surroundings are above the freezing point. The specific latent heat of fusion for water is 330,000 Joules/kg, or if you prefer this in BTU, 142 BTU/lb.
water energy
Yes
Endothermic reactions are those in which energy is absorbed during the reaction. Exothermic reactions are those in which heat is evolved during the reactions.When ice melts its absorbs energy in the form of heat so why it melts,