What is iodine needed for?
Iodine is needed for the normal metabolism of cells. Metabolism is the process of converting food into energy. Humans need iodine for normal thyroid function, and for the production of thyroid hormones
If iodine were not available how would you determine whether starch hydrolysis had occured If iodine was not available how would you determine if starch hydrolysis had occured?
Iodized salt is a combination of regular table salt, sodium chloride, with a small amount of a salt of iodine, potassium iodide. Iodized salt has gained popularity in some countries because iodine is needed by the thyroid to function properly and iodine deficiency can cause the thyroid disease called goiter.
Non-polar bonds, or more specifically, temporary dipole-dipole bonds. The intermolecular forces in iodine (solid at room temperature) are considerably strong compared to the other halogens. These stronger bonds means that more heat energy is needed to break them, thus the melting and boiling points of iodine are higher. The strength of the bonds is distinguished by the size of the element's molecules - fluorine has the smallest molecules, and iodine has the largest.
There is no nutritional content to salt- it is not a food and so does not belong to any food group. It is needed mineral, but there is enough salt already present in foods that you do not have to add any. The iodine is also a needed mineral and maybe if you did not eat anything else that had iodine, you could use a little iodized salt in your diet.