Indicate whether the following are measurements of length, area, volume, mass, density, time, or temperature. a) 5 ns b) 3.2 kg/L c) 0.88 km d) 540 m2 e) 173 K f) 2 mm3

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?