Starch when mixed with Iodine turns a deep shade of blue because starch contains amylose. Amylose is a soluble component of starch as well as other carbohydrates.Know More
Amylose molecules are made up of single strands of glucose molecules shaped like springs. When iodine is added to a starch, it adheres to the beta amylose molecules because of their solubility. The starch pushes the iodine into a line in the middle of the amylose coils and creates a transfer of charge between the iodine and starch. This causes a change in the arrangement of electrons and energy level spacings. The new spacings absorb visible light differently and create the deep blue color.
Iodine is often used to test foods for starch. Adding iodine to potatoes, dried beans, rice, bread and pasta creates the deep blue reaction to indicate the presence of starch. To perform the test, use a dropper to add one or two drops of iodine to each type of food. Use other foods that do not contain starch, such as apple slices, carrots and sugar, for comparison. Test both a ripe and unripe banana, and notice that the unripe banana contains starch while the ripe banana does not. This demonstrates how the amount of starch decreases as a fruit ripens.Learn More
Blue litmus paper turns red when it is exposed to acidic conditions; red litmus paper does the opposite, turning blue when exposed to basic conditions. The color that the litmus paper turns depends on what color it is initially.Full Answer >
Beans contain both starch and protein, making them a part of each group. When eating one serving of beans, it counts as both one serving of starch and one serving of protein. Starchy vegetables like beans are a benefit in any diet because they are low in fat and filling.Full Answer >
Sodium Hypoclorite is a safe disinfectant to use in a health care setting, as long as it is used according to directions. Sodium Hypochlorite solution is bleach. The chemical formula is NaOCl.Full Answer >
Zinc nitrate is commonly used in the manufacture of inorganic zinc compounds ranging from catalysts to pigments and mordant in dyeing. This compound is also used in the manufacturing of medicines. Zinc nitrate solution is used as a foliar spray, and it is also added to irrigation water or liquid fertilizer for soil application. Zinc nitrate is an excellent precursor for the production of high-purity compounds and nanoscale materials.Full Answer >