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.