MCAT General Chemistry Question 22: Answer and Explanation

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Question: 22

7. Metals are often used for making wires that conduct electricity. Which of the following properties of metals explains why?

  • A. Metals are malleable.
  • B. Metals have low electronegativities.
  • C. Metals have valence electrons that can move freely.
  • D. Metals have high melting points.

Correct Answer: C

Explanation:

All four descriptions of metals are true, but the most significant property that contributes to the ability of metals to conduct electricity is the fact that they have valence electrons that can move freely. Malleability, choice (A), is the ability to shape a material with a hammer, which does not play a role in conducting electricity. The low electronegativity and high melting points of metals, choices (B) and (D), also do not play a major role in the conduction of electricity.

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