How is radiant energy from the microwave transformed into heat energy?

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According to the web

"How is electromagnetic energy from the microwave transformed into heat energy? The waves emitted from the microwave sends the molecules within the object into a faster motion. The heat is generated from the faster movement of the molecules in the object. ... It is only transformed into new substances or energies."

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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 major pests we deal with are insects, weeds and fungal diseases. a pesticide is a product, whether organic or chemical, used to kill the target pest. there are other techniques gardeners should use that can prevent the severe infestations that make the use of pesticides necessary