Dip one Q-tip into concentrated hydrochloric acid (HCl) and a second cotton swab into concentrated aqueous ammonia (NH3). Simultaneously insert both cotton swabs into the ends of the glass apparatus ...

Balloons filled with H2, He, and O2 are shown immediately after being inflated and then again in the following lecture. Differing rates of effusion can be seen. Show H2, He, and O2 balloons inflated ...