Henri becquerel discovered this element was radioactive when he stored a piece of it in a dark drawer with some film. a couple days later, upon developing his film, he saw an image of the element on the film. which element did he discover was radioactive?

Asystematic approach to problem solving is called a (an)

True or false graphs must include scales that increase by the same amount

On a day when the barometer reads 75.23 cm, a reaction vessel holds 250 ml of ideal gas at 20 celsius. an oil manometer ( ρ= 810 kg/m^3) reads the pressure in the vessel to be 41 cm of oil and below atmospheric pressure. what volume will the gas occupy under s.t.p.?