When an athlete gets hurt they apply sometimes an instant cold pack to the injury. The instant cold pack works by mixing two chemicals that create a chemical reaction. What evidence is there that a chemical reaction is taking place in the cold pack?

A) change in odor
B) change in color
C) formation of gas
D) temperature change

Which statement best identifies the process shown? the process must be fusion because energy is released. a. the process must be fusion because a heavier nucleus forms from smaller nuclei. b. the process must be fission because a large nucleus breaks into smaller nuclei. c. the process must be fission because neutrons are formed.