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.
In each case, describe the change as a chemical or physical change. Give a reason for your choice.
(a) Salt dissolves when you add it to water.
(b) Food is digested and metabolized in your body.
(c) Crystalline sugar is ground into a fine powder.
(d) When potassium is added to water there is a purplish pink flame and the water becomes basic (alkaline).
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