What mass of compound must be weighed out to have a 0.0223 mol sample of h2c2o4 (m=90.04 g/mol)?

What is the ph of a 0.0010 m hno3? 1.0 3.0 4.0 5.0

Acontrol during an experiment. might change remains constant does not exist does change

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.