Question

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? A B D E F G H I J K C

Answer 1

elements cannot be broken down by chemical means
compounds are composed differnt elements