explain why the student could not use this apparatus to determine the boiling point of substance B (substance b melts at 60°c and boils at 190°c)

Express the following number in scientific notation. 0.026890 =

If 22.5 liters of oxygen reacted with excess of hydrogen, how many liters of water vapor could be produced?

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.