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physical
This is an endothermic process (need energy for melting), a physical change..
Its not a physical change because, the food broken down can't go back to its original form. All in all, its a chemical change.
Conduction of energy is a physical change.
respiration
It can be either. A hot cup of water, which just sits and becomes cooler, is releasing heat energy and if it is outside in really cold weather it will freeze. This is just a physical change. Burning oil, paper, wood, coal, any substance like those, releases heat energy also, but these are all chemical changes.
Energy is released when chemical bonds are formed.
energy is part of a physical change
Yes, physical changes involve a small change in energy.
Physical
Physical Change
The conductor of energy is not a physical change. The conduction of energy happens due to a chemical bonding of specific metals. A conductor of energy produces a flow of electrical charges.