Which of the following symbolic representations of matter signifies a mixture of elements?

1) these are barrel shaped microtubules in most animal cells, that organize the spindles during cell division

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 described by the equation h2o(s)+ heat=h2o(i) a freezing melting condensing evaporating