Hi :) why must litmus paper be moistened to test for ammonia ?

List four observations that indicate that a chemical reaction may be taking place

Select each correct answer. more than one answer may be correct. which of the following is a characteristic of unicellular organisms? they can possess tissues and organs. all of their functions are performed by a single cell. they are usually microscopic. each of their cells is specialized to perform a specific function.

Which element would mostly likely have an electron affinity measuring closest to zero