Question

Which experimental design would be best to use in investigating the boiling points of water and ethanol?(1 point)A. Mix samples of water and ethanol in a beaker, then heat using a Bunsen burner. Measure the temperature at which the sample boils using a thermometer. Record this temperature as the boiling point.B. 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. Record these temperatures as the boiling points.C. 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 several trials and record the average temperatures as the boiling points.D. Mix samples of water and ethanol in a beaker, then heat using a Bunsen burner. Measure the temperature at which the sample boils using a thermometer. Conduct several trials and record the average temperature as the boiling point.

Answer 1

Letter B, heating samples in different beakers are better since you know the compounds you are testing, Letter A is better if you are trying to find out which compounds you have in a mixture, by the difference of boiling point you can either obtain this compound or determining. Letters C and D follow the scientific method but since it requires more time and resource, it would not be the best choice because boiling points don't need too much testing