Chemistry (12th Edition)

Published by Prentice Hall
ISBN 10: 0132525763
ISBN 13: 978-0-13252-576-3

Chapter 1 - Introduction to Chemistry - 1.3 Thinking Like a Scientist - 1.3 Lesson Check: 21

Answer

A hypothesis should be developed before you experiment so you know what you are testing; after the experiment takes place you may or may not be able to reject the proposed hypothesis, if your hypothesis is not true you have to test a new hypothesis that will be true in another experiment.

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The answer to this question is stated on page 22 in the textbook.
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