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.
Classify each of these as an element, a compound, a heterogeneous mixture, or a homogeneous mixture. Explain your choice in each case.
(a) Table salt (sodium chloride)
(b) Methane (which burns in pure oxygen to form only carbon dioxide and water)
(c) Chocolate chip cookie
(d) Silicon
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