Engineering, 25.05.2021 04:30, patricklap4951

1. 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? *

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1. Ethan is observing chemical and physical properties of a substance. He heats a substance and obse...