Rate of a reaction is the speed which a reaction takes place.
Rate of a reaction depends on the surface area of the particles. More is the surface area, more will the rate of reaction as more of the particles surface would be exposed for the reaction to occur.
Surface area is increased by decreasing the size of the particles.
Thus a large log will burn slower as compared to the same log cut into small sticks of wood as lesser area will be exposed to air and thus rate of burning will be slow.
At the eutectic composition, an alloy can solidify at a constant temperature : TRUE . this is because at eutectic composition the type of reaction that takes place there is invariant reaction in its thermal equilibrium
For effective dispersion strengthening, the dispersed phase should be needle-like, as opposed to round : FALSE. because the rounded shape will not cause a crack.
Intermetallic compounds are usually hard and brittle : TRUE. because Intermetallic compounds prevents dislocation movements and this makes them brittle and hard
For the effective dispersion and strengthening, the dispersed phase should be continuous : FALSE. this is because the dispersed precipitate must be small and not continuous
Stoichiometric intermetallic compounds exist over a range of compositions : FALSE
Faster solidification results in smaller interlamellar spacing : TRUE
