Question

Ethan is observing chemical and physical properties of a substance. He heats a substance and observes that the substance turns from a brown solid to a black powder. He refers to several chemistry journals that claim this represents a chemical reaction. From his observation and research, he concludes that the substance goes through a chemical change when heated. How can Ethan best defend his conclusion?
A by demonstrating that the substance will eventually melt if the temperature continues to increase
B by verifying that the substance is now made up of different molecules than before it was heated
C by verifying that the substance is made up of only one type of element
D by demonstrating that the substance is less dense after it is heated

Answer 1

your answer?

Answer 2

The answer is B

Hope I helped you! :)