The chemical formula for ammonia is NH3. What composes this compound?

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 of the following is in the lanthanide family? a) uranium b) promethium c) silver d) gold

Which fossil fuel is mainly used for heating and cooking? a. electricity b. coal c. petroleum d. natural gas