why does ice make a popping noise when sprinkled with ice melt?

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I think I understand that it has something to do with the release of oxygen? Still don’t really understand. Thanks in advance to anyone who will answer!!

In: Chemistry

The crystal structure of the ice breaks apart when melting because it melts faster in some places than in others. This creates tension which is released as a crackling sound. The ice melt (calcium chloride) might exaggerate the effect because it is faster than natural melting or it happens more unevenly, creating more tension.