200mL of 400M ammonium sulfide would require how many mL of 300M gallium nitrite to react completely?

If a || b and e || f, what is the value of y ?

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.

What is happening when the water inside a kettle heats up and begins to boil