Carbohydrate lab student question data sheet pre lab questions 1 what elements make up all carbohydrates 2 what is the general formula for any monosaccharide 3 using benedicts and iodine tests how can you tell if a carbohydrate is the . Carbohydrates are an energy source or are used in making cell structures objectives upon completing this lab you will 1 biology carbohydrate test question data sheet names pre lab questions write your responses to these questions on your lab sheet 1. Carbohydrates serve as an energy source and may be used in making cell structures objectives upon completing this lab the student will be able to 1 write a molecular formula for several carbohydrates 2 write your responses to these questions on your lab data sheet examine the chemical formula of water h 2 o 1. Chemistry 108 carbohydrates lab 2 c remove the tube labeled for starch from the boiling water bath repeat step 4 but use the starch solution instead of the fructose solutionrecord your results in the data table d remove the tube labeled for lactose from the boiling water bath repeat step 4 but use the lactose solution instead of the fructose solution