One of the activity of laboratory is the addition of acid to water.
The addition of acid to water make it easier for the reaction so that the acid gets diluted safely. On the other hand if water is added to acid it will get splash vigrously and may injure the hand of the chemist. The addition of water directly to acid contribute to exothermic reaction and releases more heat which may result in spraying around.
Adding acid to water, result in solution with very dilute solution and releases small heat. This small heat is not sufficient even to vaporizes a single drop of water.
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
