Why would a laptop, a car, a cellphone, and a watch all contain chemical energy?

In which phase(s) do the molecules take the shape of the container?

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?

How many grams of sodium chloride are in 250ml of a 2.5m naci solution