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Leokris [45]
3 years ago
12

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

Biology
2 answers:
FromTheMoon [43]3 years ago
7 0

Answer:

the answer is stop watch

Julli [10]3 years ago
5 0
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.
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