Answer:
Experiment plays many roles in science. One of its important roles is to test theories and to provide the basis for scientific knowledge. It can also call for a new theory, either by showing that an accepted theory is incorrect, or by exhibiting a new phenomenon that is in need of explanation.
Explanation:
The answer is NaCl
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The Answer is D. Suspending a heavy weight with a strong chain.
The correct response is A. Only the Fe is unbalanced.
