The volume of a gas is 250 mL at 340.0 kPa pressure. With the temperature
remaining constant, what will the volume be when the pressure is reduced to
50.0 kPa?

OA) 37 mL
OB) 68 mL
OC) 1200 mL
OD) 1700 mL

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?