The mohs' scale is used to measure hardness. The Mohs scale of mineral hardness is a qualitative ordinal scale
that characterizes the scratch resistance of various minerals through
the ability of a harder material to scratch a softer material.
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a compound is a molecule made of atoms from different elements.
a. by the combination of an unlimited number of elements
In a heat of an engine, if 700 j enters the system, and the piston does 400 j of work what is the final internal (thermal) energy of the system if the initial energy is 1,500 j