GIVING MEDALS AND FANNING

Which of the following observations gives evidence that a chemical reaction has occurred?

A. A solid piece of calcium carbonate is crushed into a fine powder.
B. Hydrogen peroxide is poured out of its bottle onto a cut in the skin, forming bubbles of oxygen.
C. Solid aluminum is rolled out as a thin, flat sheet, cut, and formed into the shape of an aluminum can.
D. A toy boat floates higher in saltwater than in plain water.

Question

GIVING MEDALS AND FANNING

Which of the following observations gives evidence that a chemical reaction has occurred?

	A. 	A solid piece of calcium carbonate is crushed into a fine powder.
	B. 	Hydrogen peroxide is poured out of its bottle onto a cut in the skin, forming bubbles of oxygen.
	C. 	Solid aluminum is rolled out as a thin, flat sheet, cut, and formed into the shape of an aluminum can.
	D. 	A toy boat floates higher in saltwater than in plain water.

anonymous · Answer

The formation of a gas is an indication that a chemical reaction may have taken place.

anonymous · Answer

so whats the answer...

anonymous · Answer

I gave you a hint. What do you think?