Question

MULTIPLE CHOICE
In four of the following groups, the three
substances are either all strong electrolytes,
all weak electrolytes, or all nonelectrolytes.
Which group has one member which is NOT
like the others in the group?
1. NaCl; Ca(OH)2; HNO3
2. O2; CO(NH2)2; CH3OH
3. BaCl2; NaNO3; HF
4. NH3; CH3COOH; HCN
5. H2SO4; NaOH; HCl

Answer 1

go through each one and decide if it is ionic or molecular. if it is ionic it will be a strong electrolyte. Now if it is molecular, it will be an acid, base or all other moleculars. If it falls into the category of acid or base... look up the strong acids and bases in your textbook because there are only a few. If it is a strong acid or strong base, it is a strong electrolyte, if it is not one of those, all other acids and bases are weak electrolytes. If it is not an acid or base and is molecular, it will be a non electrolyte. Keep in mind ammonium is an exception and it will always be a strong electrolyte even though it is molecular.

Answer 2

for example, group 1. NaCl, ionic because metal and non metal, the next one is a strong base and the next one is a strong acid... therefore, row one are all strong electrolytes