Give the repeating units and the names of the polymers which are formed from the polymerization of: a) 1,1-Difluoroethene (also known as vinylidene fluoride)
b) 1-Heptene

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?