Briefly explain the difference between self-diffusion and interdiffusion.

(a)Compare interstitial and vacancy atomic mechanisms for diffusion.
(b)Cite two reasons why interstitial diffusion is normally more rapid than vacancy diffusion.

State the formula for density in words and mathematical symbols

In the 1800s, one of the statements in john dalton's atomic theory was that atoms are indivisible. later experimental evidence led to the discovery of subatomic particles such as neutrons, electrons, and protons. what happened to the indivisible atom part of dalton's atomic theory, and why?

Which of the following shapes would represent a molecule with two bonded atoms and 3 lone pairs on only one of them , trigonal planar , bent , trigonal pyramidal , linear