This reaction is a displacement reaction because iron displaces copper from copper sulfate solution, leading to the formation of iron sulfate and elemental copper.

Endothermic reactions absorb energy from the surroundings and typically feel cold to the touch, while exothermic reactions release energy into the surroundings, often in the form of heat, and feel warm or hot.

Endothermic reactions are those in which energy is absorbed from the surroundings. This can occur in the form of heat, light, or electricity, as seen in processes like the decomposition of silver chloride in sunlight.

In black and white photography, light-sensitive silver halide crystals, such as silver chloride, undergo decomposition when exposed to light, forming metallic silver particles that create the photographic image.

White silver chloride turns grey in sunlight due to the decomposition of silver chloride into silver and chlorine by light energy.