In a laboratory investigation, ammonium chloride was dissolved in water.
Laboratory procedures and corresponding observations made by a student
during the investigation are shown in the table below.
69 Identify two types of bonds in the solute. 
|Answer-->covalent and ionic
70 State evidence from the investigation that indicates the NH4Cl(aq)
solution is saturated. 
|Answer--> Not all NH4Cl dissolved.
71 State evidence from the investigation that indicates the process of
dissolving the NH4Cl(s) in water is endothermic. 
|Answer--> The temperature decreased during the
72 State the observation that would be made if procedure 3 is repeated
with the original temperature of the H2O(ℓ) at 98°C.