Question

Justin Bleeber is conducting a calorimetry experiment in chemistry class. He fills an empty soda can with water and hangs it from an iron ring. The can hangs above a cracker that is resting on a stand. Justin uses his striker to light a Bunsen burner. He uses the flame from the Bunsen burner to light a wooden splint. The wooden splint is used to ignite the cracker. As the cracker burns it heats up the water in the soda can. Waves of gas are seen coming out of the top of the can. How many chemical changes did Justin observe?

Answer 1

The correct answer is 3 or three !!!

Why ?

Because : The burning of gas in the Bunsen burner, lighting of the splint, and ignition of the cracker are all chemical changes. The heating of the water is a physical change.

Answer 2

Justin Bleeber noticed almost 4 chemical changes while conducting his experiment with a soda can. He noticed chemical changes in cracker burns when it heats the water in a soda can. He observed the chemical change when the waves of the gas are seen coming out on the top of the can. He also observes changes while he uses the flame from Bunsen burner to light a wooden split.