Salt water causes marine ecosystems to be very different fro - GED Prep
Question
Salt water causes marine ecosystems to be very different from freshwater ecosystems. Organisms in both types of ecosystems are affected by the freezing and melting of ice. An experiment was conducted to test the hypothesis that ice melts faster in salt water than in fresh water. Ice cubes made of fresh water were placed into cups containing either fresh water or salt water. Various data were recorded, and the energy released by each melting ice cube was calculated from the data. The table shows the results for each cup.
What statement describes one or more needed changes to this experiment that would allow the experimenter to draw a valid conclusion? You may use a calculator.
Answers
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Explanation
The correct answer is:
At the beginning, both cups should have contained the same mass of water at the same temperature.
To draw a valid conclusion, the experiment needs consistent initial conditions. The table shows different starting masses and temperatures for fresh and salt water, introducing variables that could affect melting rates independently of salinity. By standardizing the initial mass and temperature, we isolate the effect of salt content. This change would allow for a fair comparison between fresh and salt water's impact on ice melting, enabling the experimenter to accurately test their hypothesis and draw a valid conclusion about the relative melting rates in each environment.
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