Để chứng minh phenol có tính axit, ta cho phenol tác dụng với dung dịch

how to make a simple air condition

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.

c) should be the answer.