The correct response is A. Only the Fe is unbalanced.
Answer:
It's a heterogeneous mixture.
Explanation:
Diamond is made of just one element: carbon. Each carbon atom in diamond is connected to four other carbon atoms, in a crystal that extends on and on. There are other forms of pure carbon where the atoms are bonded differently, notably charcoal and graphite.
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I believe the correct answer from the choices listed above is the third option. Brass is an example of a solution. Brass<span> is a homogeneous </span>mixture<span> of copper and zinc in which the concentration of zinc and copper is the same throughout the entire </span>mixture making it a solid solution.