Question

question 10 of 10
a class is performing an experiment to keep an ice - cube solid as long as possible.
which students actions could be a source of error in this experiment?
a. jerrie used different sized ice cubes each time he repeated the experiment.
b. jody included a fan in her experiment, and katie did not use a fan.
c. maria wrapped the ice cube tightly in cotton and aluminum foil.
d. carey measured the quickly melting cube every 5 minutes.

Explanation:

In a scientific experiment to keep an ice - cube solid for as long as possible, variables should be controlled. Using different sized ice - cubes each time (Jerrie's action) changes a key variable that can affect the melting time. A fan (Jody's action) can change air circulation which is an experimental factor, but if it's part of the experimental design to test its effect, it's not an error. Wrapping the ice - cube (Maria's action) is a valid way to insulate it. Measuring the melting cube at regular intervals (Carey's action) is a proper data - collection method. But using different sized ice - cubes disrupts the consistency of the experiment.

Answer:

A. Jerrie used different sized ice cubes each time he repeated the experiment.