Chemists recognize many different elements, such as gold, or oxygen, or carbon, or iron. suppose you got some iron, and started splitting it into smaller pieces. the smallest piece that would still be called 'iron' would be:

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