Answer:
Hypothesis: Adding salt to fresh water will cause the water to boil at a higher temperature.
Independent Variable: The amount of salt added to the water.
Dependent Variable: The temperature at which the water boils.
Control Group: The pan with fresh water only, without salt added.
Experimental Group: The pan with salt added to the water.
Procedure: Put 1L of fresh water into two pans, add 50 grams of salt to only one of the pans, place both pans on the stove and set the heating elements to the same temperature, and monitor the water temperatures until both pans boil.