2502 + 02 - 2803 What is the mole ratio for O2 to SO3?
1
O
O
N CUI NON CO
o
1

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?