Explain how the conservation of energy and the coservation of matter might still be considered true when put together in spite of the ability of each to convert into the other

Answer 1

This is a bit confusing as stated because it says "Conservation of energy and mass (better to say mass than matter) .... might still be considered true ... in spite of...convert(ing) into the other". Yet that is the physical principle which is given as a result of special relativity: E = mc² which means for a given amount of energy or mass, you can determine the other via this formula. When energy goes to mass or mass goes to energy (such as nuclear fission), this famous formula from Albert Einstein shows definitively not that conservation of energy and mass is "considered" true, but is proven true for all such instances, nuclear or chemical.