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.
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A displacement reaction Would occur in this situation
Answer:
heat flows from the object that has more thermal more energy to the object with less thermal energy
amount of product formed or amount of reactants used / time
