Methane is a compound which is 75% carbon, by mass, the balance being hydrogen. if a sample of methane weighs 24 g, what mass of hydrogen does it contain?

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.

In the cathode ray tube experiment, j. j. thomson passed an electric current through different gases inside a cathode ray tube in the presence of an electric field. in which two ways did this experiment change scientists’ understanding of the atom?

Which ocean zone has the most abundant primary producer and why a) the abyssopelagic zone ,du to the absence of light and cold water temperatureb) the bathypelagic zone, due to the absence of light and cold water temperaturec) the mesopelagic zone ,due to uts high light availability and warm water temperature d) the epipelagic zone, due to its high light availability and warm water temperature