A beaker of black powder can be a mixture with different substances (i.e gunpowder: a mixture of sulfur, charcoal, etc.), an element which can probably be carbon (known as black), and a compound as well which can be potassium nitrate. Hence, the answer is D.
Answer:
<u><em>79.72 Calories</em></u>
Explanation:
A long chain of hydrocarbon bonded to COOH is a FATTY acid.
Тhe arrow should point to the atom with greater electrical energy, in the case of the chlorine atoms
