- Coin TestDuring class, the chemistry professor was demonstrating the properties of various acids. "Now I'm dropping this silver coin into this glass of acid. Will it dissolve?""No, sir," a student called out."No?" queried the professor. "Perhaps you can explain why the silver coin won't dissolve.""Because if it would, you wouldn't have dropped it in." -동전 용해 시험수업 중에, 화학..