In a neutral compound, the sum of the oxidation states is zero. note that the sign of the oxidation states and the number of atoms associated with each oxidation state must be considered. in h2o, for example, each hydrogen atom has an oxidation state of 1 and each oxygen atom has an oxidation state of −2 for a total of 2( 1) (−2)

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

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.

have a great day because if you dont you and i will be sad