While performing an experiment involving a reaction between two chemicals the scientists observes that the reaction container has become warm the observation is an example of

Exothermic reaction

Explanation:

While performing an experiment involving a reaction between two chemicals the scientists observe that the reaction container has become warm. The observation is an example of an exothermic reaction, that is, a reaction that releases heat which is transferred to the container and used to increase its temperature.

chemistry sucks a**

explanation:

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.