Topical Questions
These questions are keyed to the major topics in the chapter. Usually a question that is answered at the back of this book is paired with a similar one that is not.
A finely divided black substance is placed in a glass tube filled with air. When the tube is heated with a Bunsen burner, the black substance turns red-orange. The total mass of the red-orange substance is greater than that of the black substance.
(a) Can you conclude that the black substance is an element? Explain briefly.
(b) Can you conclude that the red-orange substance is a compound? Explain briefly.
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