1. Pennies manufactured after 1982 are made of zinc metal, Zn, with a coat of copper metal, Cu. Zinc is more easily oxidized than copper. Why, then, don’t these pennies quickly corrode? 2. Water is...

1. Pennies manufactured after 1982 are made of zinc metal, Zn, with a coat of copper metal, Cu. Zinc is more easily oxidized than copper. Why, then, don’t these pennies quickly corrode?

2. Water is 88.88, oxygen by mass. Oxygen is exactly what a fire needs to grow brighter and stronger. So, why doesn’t a fire grow brighter and stronger when water is added to it?