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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the small 0.38-kg slider is known to move from position a to position b along the vertical-plane slot. determine (a) the work done on the body by its weight and (b) the work done on the body by the spring. the distance r = 0.70 m, the spring modulus k = 154 n/m, and the unstretched length of the spring is 0.53 m

explanation:

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