Commercially available hot packs are simple in design: a pouch with water on one side, isolated by a barrier from a specific sal
t on the other side. When the barrier is broken, the salt and water mix and the solution becomes hot. Select the statement that is true about the reaction occurring in hot packs.A. The hot pack absorbs heat from the environment. B. The reaction between the salt and water is exothermic.
C. The reaction between the salt and water is endothermic.
D. The reaction between the salt and water is neither endothermic nor exothermic.
It has a fixed mass it does not change with the shape of the container it cannot be compressed it has fixed atom and molecules and limited to very small displacement only vibrational motion occur in the molecules of solid .
Alkali metal hydroxides can be used to test the identity of metals in certain salts. The colour of the precipitate will help identify the metal : Calcium hydroxide is soluble; no precipitate is formed.
