How many atoms are there in 3.3 moles of strontium?

Which theory was contradicted by experiments with the photoelectric effect? light spreads out after it passes through a small opening. as soon as light strikes metal, electrons will be ejected. visible light, regardless of color, will cause the ejection of electrons when striking metal. the kinetic energy of ejected electrons depends on the frequency of light that strikes the metal.

Which substance is a steroid? cholesterol fatty acid monosaccharide trans fat

Air can be considered a mixture. which statement does not explain why?