I think its
<span>The Mechanical energy in a mechanical system is determined by adding the potential and kinetic energy together. </span>
Something made of pure iron<span> is softer </span>than steel<span> because the atoms can slip over one another. If other atoms like carbon are added, they are different from </span>iron<span> atoms and stop the </span>iron<span> atoms from sliding apart so easily. This makes the metal </span>stronger<span> and </span>harder<span>.</span>
Answer:
C2H6 OR C6H12O6 THE ANSWER
