Fresh water and salt water often differ in terms of densitie

Fresh water and salt water often differ in terms of densitie - GED Prep

Question

Fresh water and salt water often differ in terms of densities, meting, and freezing points. In most instances, living organisms in these two environments are affected by both the freezing and melting points of these two types of water. A student theorized that ice melts faster in salt water compared to fresh water. He conducted and experiment by making ice cubes of fresh water and adding them to equal volumes of freshwater and salty water. He also calculated the amount of energy released in both experiments and recorded the data as shown below;

Cup	Initial mass of water	Final mass of water	Change in mass	Initial temp	Final temp	Change in temp	Time for ice to melt	Energy released
Fresh water	80g	92g	12 g	50	32	-18K	134	26.88
Salt water	70g	85g	15g	54	46	-8k	520	25.65

Among the statements below, which statement describes one or more needed changes to this experiment that would allow the experimenter to draw a valid conclusion?

Answers

correct

At the beginning, both cups should have contained the same mass of water at the same temperature.
The time for ice cubes to melt should have been measured in minutes.
The energy released should have been measured, not calculated.
Salt water should have been used to make the ice cubes for the cup of salt water.

Explanation

In undertaking the experiment, the researcher should have ensured that the initial conditions for the two experiments are the same. This is critical in understanding the impact the of the ice cube on either the fresh or salty water. This could be attained by using equal volumes of water and ensuring that the initial temperature of the two solutions is the same

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