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A nail rusts when the iron in the nail reacts very slowly with oxygen to form a new substance and heat. this is an example of a(n) ________ reaction. a. fusion b. fission c. exothermic d. endothermic
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A nail rusts when the iron in the nail reacts very slowly with oxygen to form a new substance and heat. this is an example of a(n) ________ reaction.

a. fusion
b. fission
c. exothermic
d. endothermic

User FPGA
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It's a FUSION reaction because Iron and Oxygen react together to make Iron Oxide (rust) and it's EXOTHERMIC because the reaction forms heat (stated above), which means it's releasing energy. 
User Nick Bastin
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