¿calculate percent (mass) of al, s, eo in al2 (so4)3?

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?

Which substance can be broken down by chemical means

Volume is a measurement of how fast particles of a substance are moving