The answer choices:
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[B]: rusting iron ; AND:
[D]: rubbing a marker on paper;
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are BOTH examples of a chemical reaction.
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Note: Rusting iron is, more specifically, a "redox" (or, "oxidation/reduction") reaction.
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The correct subscript for the reaction would be two. Oxygen gas exists as a diatomic molecule in nature. Also, the subscript two would balance the reaction. In balancing reactions, it is important that the atoms on each side of the reaction is equal.
Explanation:
Because the solution only contains Na+ and Cl− ions, and water, and not the metal Na(s) . You cannot evaporate the water from the solution and hope to obtain anything but NaCl(s) .
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Na(s) has an electron configuration of 1s^2 2s^2 2p^6 3s^1 , but Na+(aq) has an electron configuration of 1s^2 2s^2 2p^6 . That means they are not the same element, and thus, there is no straightforward way of extracting Na(s) from a NaCl (aq) solution
The answer would just be:
<span>Tungsten
</span>hope that this helps you! =)
