Use the periodic table to write the electron configuration of selenium (Se). s p d 1 2 3 4 6 10

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins

Consider the directing effects of the substituents on salicylamide and predict the possible structures of the iodination products. which do you think will be the major product?

When the chemicals iron sulfide (fes) and hydrochloric acid (hcl) are combined, bubbles appear from the mixture. 1. does the appearance of bubbles indicate a physical or chemical change? 2. why do the bubbles indicate this change? 3. what property is this?