Describe how to find the atomic number for the element oxygen

Heat is the total potential energy of a substance that can be transferred. true false

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

Which of the following is in the lanthanide family? a) uranium b) promethium c) silver d) gold