Which of the oxidation states would commonly be shared by Pb, Zn, & Co?

Match the mixture with the substance// i really need on this guys (it’s a pic btw)

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?

What is the equation fort the alkaline zinc/manganese dioxide cell. a) anode b)cathode c)overall equations.