Lead nitrate and Potassium iodide are both clear liquids when in solution. When we mix these two solutions a yellow solid is fomed What observation suggest a chemical change has occurred? Explain

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before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.

im not intirely sure but i think the anwser is d relative humidity