A teacher wants to perform a classroom demonstration that illustrates both chemical and physical changes. Which
would be the best demonstration that she could use?
O bending a piece of aluminum
O breaking a matchstick
O dissolving sugar in water
O burning a candle
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Ответ:
Ответ:
Hydrogen concentration to PH
For a neutral solution, [H+] is 10−7, or pH = 7. For larger hydrogen ion concentrations, then, the pH of the solution is < 7. For example, if the hydrogen ion concentration is 10−4, the pH = 4 and the solution is acidic.
Explanation: