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

Which of these tools should she use for this purpose?

A. an electronic balance
B. a stopwatch
C. a barometer
D. a graduated cylinder



Answer :

Final answer:

A stopwatch should be used for measuring how long it takes for the contents of a beaker to change color in a scientific experiment.


Explanation:

A stopwatch should be used to measure the number of seconds it takes for the contents of a beaker to change color. This tool allows for accurate timing of reactions or changes in color in a laboratory setting.

For example, in an experiment involving chemical reactions, the stopwatch can help track the time taken for a solution to transition from clear to purple, aiding in data collection and analysis.

Using a stopwatch ensures precise measurement of reaction times and is vital in scientific experiments where timing is crucial.


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