Question

Experimental design:

Heat samples of water and ethanol in two separate beakers using a Bunsen burner.
Measure the temperatures at which the samples boil using a thermometer.
Conduct multiple trials and record the average temperatures as the boiling points.
Select two (2) additional steps that make sense for the logical completion of this experiment.

(2 points)

Exchange ethanol samples for methanol samples since both are clear liquids.

Make a prediction that ethanol will boil at a lower temperature than water due to weaker intermolecular attractions between molecules.

Design a table that can support data collection between temperatures of the water and ethanol.

Mix the samples of water and ethanol in a beaker to test your prediction.

Answer 1

Select steps 2 and 3.

- Make a prediction that ethanol will boil at a lower temperature than water due to weaker intermolecular attractions between molecules. (A hypothesis is part of the scientific method and guides the experiment.)
- Design a table that can support data collection between temperatures of the water and ethanol. (A data table ensures organized recording of multiple trials and calculation of averages.)

(The other options are inappropriate: exchanging ethanol for methanol changes the experimental subject; mixing the two liquids creates a solution with different boiling behavior and does not test the pure boiling points.)