... control. Usually, a control goes through all the steps of the experiment but lacks one essential factor (the experimental variable). The missing factor allows you to observe the difference between a positive result and a negative result. If the control sample tests positive, we know that our test is fail. All of the experiments below, except for the iodine test, require that you use a sample solution. Therefore, if you are using a non-liquid sample, we must first dissolve, mix or mash the sample in water (a few drops) before adding any reagent. A) Reducing sugar Materials: * * Benedict's reagent * Test tube * Beaker * Hot plate * Apple juice, coke, potatoes, onions, and soy beans Methods: 1. A boiling water bath is made by filling a beaker about half full of water and it is heated on a hot plate. This water bath is used in several activities. 2. 1 ml of apple juice ...

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