What is occurring during the flat section of the graph below on the red arrow labeled melting, between solid and liquid? boiling melting gas liquid solid freezing time (minutes) temperature (°C)

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Q: Br2 H20

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UV Visible Spectroscopy

Spectroscopy refers to the absorption or emission of light or other radiations by matter. When a substance or chemical absorbs light or radiation, they reach an excited state followed by de-excitation or emission of the light or radiation forming distinct spectra. UV-visible spectroscopy or  ultraviolet-visible refers to the absorption and emission in the ultraviolet and visible regions of the electromagnetic spectrum.