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Sian wants to measure the number of seconds that it takes for the contents of a beaker to change from clear to purple
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Sian wants to measure the number of seconds that it takes for the contents of a beaker to change from clear to purple

User Victor Kotseruba
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2 Answers

4 votes

Answer:

the answer is stop watch

User Blunderfest
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Simply use a stop watch. Begin the stop watch when the necessary elements have been added and stop it immediately as soon as it turns purple. Repeat the process a few times to make sure the timing is accurate.
User Mayank Jha
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