Choose the best answers from the choices below. Only pure elements can be pure substances.
A volume of liquid containing only one type of
molecule is a pure substance.
Only pure compounds can be pure substances.
A pure substance is composed of either one type
of element or one type of molecule.
A volume of gas containing only one element is a
pure substance,

Which is one reason many african nations have not prospered after gaining independence from european colonial powers? a. colonial powers sent their weakest economic advisors to the new countries, and their recommendations were flawed. b. independence left them with weak economies, and many countries have been unable to overcome or recover from these burdens. c. the desert region of the interior is inhospitable to foreign investors, and business interests focused on the coastal mediterranean cities. d. the money endowed upon independence is still tied up in the bank of england, which is hesitant to make loans to struggling nations.

Why did federalists fear the louisiana purchase? what did they think would happen?

How were the okanogan highlands formed? a. by subduction, which caused huge folds in earths surface b. as a result of retreating glaciers carving great valleys into the earth c. when molten rock from under the earth approached the surface d. when the collision of volcanic island chains and ocean rocks formed new earth