Which of the following does not affect the rate of a chemical equation

Express the following number in scientific notation. 0.026890 =

The element that has the greatest electronegativity is

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.