(PLEASE HELP ASAP) Which chemical equation models the law of conservation of mass?

How many molecules are present in 3 mols of silicon dioxide (sio2)?

When the magnetic domains in a material can be aligned, but eventually drift out of alignment, the material is

Suppose a diode consists of a cylindrical cathode with a radius of 6.200×10^−2 cm , mounted coaxially within a cylindrical anode with a radius of 0.5580 cm . the potential difference between the anode and cathode is 260 v . an electron leaves the surface of the cathode with zero initial speed (v initial=0). find its speed vfinal when it strikes the anode.