Choose all the true statements concerning the law of conservation of mass:
a) When ice melts, mass is gained since water is more dense than ice.
b) 2H2 + O2 → 2H2O is a balanced equation
c) A chemical change does not follow the law of conservation of mass
d) A physical change does follow the law of conservation of mass
e) A pencil breaking is an example of a physical change
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