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Which of the following pairs of species would generate a salt derived from a weak acid and a weak base?

HCl and NaOH

HF and CH3NH2

H2S and Ca(OH)2

HNO3 and KF

Define the following terms 
a. Dative bond
 b. Alkali earth metals 
c. Alkali earth metals 
d.Irreversible reaction 
e. Chemical equilibrium 

Some farmers use ammonia, nh3, as a fertilizer. This ammonia is stored in a liquid form. Use the particulate perspective to show the transition from liquid ammonia to gaseous ammonia

a two phase liquid vapor mixture of ammonia