Chemistry...Please Help Asap

Adepositional also feature that forms where a stream enters a lake or an ocean is a

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?

Before it was launched, a helium-filled balloon had a pressure of 201 kpa at a temperature of 27°c. at an altitude of 15,000 m, the pressure had decreased to 2.5 kpa and the temperature had dropped to -14 °c. the volume of the balloon increased to 59.3 m3. what is the original volume of the balloon? 13 m3 0.85 m3 0.077 m3 1.17 m3