Juan wanted to find out whether the concentration of salt in water affected how long it takes water to cool. He put 4 identical plastic glasses, each of which contained 225 mL of a different concentration of salt solution, into a freezer. The different salt concentrations were 0 percent, 10 percent, 20 percent, and 30 percent. He recorded the amount of time it took for each solution to cool to a temperature of 3 degrees Celsius.
Identify the independent and dependent variables, constant and control in this experiment.
The independent variable in this experiment is the concentration of salt in the water. The dependent variable is the time it takes for the water to cool to 3 degrees Celsius.
The constant in this experiment is the volume of the salt solution in each plastic glass (225 mL).
The control in this experiment is the glass containing 0 percent salt solution.
The independent variable in this experiment is the concentration of salt in water.
The dependent variable is the amount of time it takes for each solution to cool to a temperature of 3 degrees Celsius.
The constant in this experiment would be the amount of water in each plastic glass (225 mL) and the temperature at which the solutions are placed in the freezer.
The control in this experiment would be the plastic glass containing 0 percent concentration of salt solution.