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Analysis with an elaborate instrument indicates that substance A contains two elements. Substance B and substance C react to give a new substance D. Substance E decomposes upon heating to give substance F and substance G. Heating substance H to 1000°C causes no change. Substance I cannot be broken down into simpler substances by chemical means. Substance J cannot be broken down into simpler substances by physical means. Heating substance K to 500°C causes it to change from a solid to a liquid. Element ? Compound? cannot be classified?

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