Chemical Tests for Nutrients
A mystery solution was tested using iodine. The mystery solution turned black while the control remained iodine-colored. What is this solution?
A complex carbohydrate, or polysaccharide, such as a starch or cellulose.
A biochemist wants to test five different mystery solutions for nutrients. In her experiment, what would be the controlled variables?
Each test tube would be the same size. Every test tube would get the same amount of liquid. Every test tube is exposed to the same temperature and reagent.
In an iodine test, what is the experiemental control?
A test tube with just iodine added and no mystery chemical. You will need this to compare the colors to determine if there was a postive reaction.