Question

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? an electronic balance a stopwatch a barometer a graduated cylinder

Explanation:

• An electronic balance is used to measure mass.
• A stopwatch is used to measure time intervals, which is exactly what is needed to measure the number of seconds for the color change.
• A barometer is used to measure atmospheric pressure.
• A graduated cylinder is used to measure the volume of liquids.

Answer:

a stopwatch