Students in science class watched as their teacher demonstrated various changes. Picture A. shows a strip of magnesium ribbon, a silver metal, in a test tube of hydrochloric acid. Bubbles are forming as the metal ribbon disappears. Also, the test tube feels warmer. Picture B. shows a container of water being heated and bubbles forming as the water bubbles. Which picture illustrates a chemical change? Explain.
A) Picture A. The magnesium ribbon disappears.
B) Picture A. Gas bubbles are produced and there is a temperature change.
C) Picture B. Bubbles are being produced as the water is being heated on the burner.
D) Picture B. There is a change in temperature as the water begins to boil and bubbles are being produced.