Achemical reaction is a process by which one or more substances transform into different substances via a chemical change. sometimes, chemical reactions exhibit evidence that can be easily observed when they occur. part a which changes are evidence of a chemical reaction?

The correct answer should be "electrons orbit the nucleus in circular motions exactly as shown on the classic bohr model."

Ans. : frostbite is when exposure to cold temperatures causes freezing to the skin or other tissues. it most commonly affects the hands, feet, and face. the longer areas are exposed to cold, typically the worse the frostbite. the water temperature used for rewarming a frostbitten part should be : (102 -105) f degrees.