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) A cup of household bleach changes the color of your favorite T-shirt from purple to pink.
(b) The fuels in the space shuttle (hydrogen and oxygen) combine to give water and provide the energy to lift the shuttle into space.
(c) An ice cube in your glass of lemonade melts.
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