Classify these compounds by whether they behave as strong acids, weak acids, strong bases, or weak bases in aqueous solution.

HI
,
H2CO3
,
HF,
LiOH
,
Ba(OH)2
,
CH3NH2
,
NH4Cl
,
Na3PO4
,HNO3

HI& HNO3= strong acid

H2CO3 &HF= weak acid

LiOH & Ba(OH)2= strong base

CH3NH2= weak base

NH4Cl = weak acid solution

Na3PO4 = weak base solution

Explanation:

HI& HNO3= strong acid because they can dissociate completely producing free Oxonium ions

H2CO3 &HF= weak acid because there dissociate partly in Solution

LiOH & Ba(OH)2= strong base because LiOH is a group one alkali which dissociate completely and Ba(OH)2 a group 2 alkali which dissociate completely as well

CH3NH2= weak base because in solution it dissociates partly forming NH4+ ion

NH4Cl = weak acid solution because it is a salt of strong acid and weak base

Na3PO4 = weak base solution

Because it's a salt of strong base and weak acid

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.