a chemical reaction a temperature change may occur because of the breaking or formation of chemical bonds that release excess energy. Since there is a change in temperature why wouldn't this reaction be considered a physical change instead of a chemical change ?

well, a chemical change will have to have something about its physically feature to be changed and it cannot be undone, say you burned wood, thats a chemical change as you cannot unburn it or remove the markings of the burn

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it may be wrong but i think its a

the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees.