You take 200. g of a solid at 30.0 °C and let it melt in 400. g of water initially at 85.1 °C. The water's temperature decreases from 85.1 °C to 30.0 °C. What is the heat of fusion of this solid?

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the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.

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explanation:

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"record the time to complete a chemical reaction" would most likely be part of a lab procedure.