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. BaCl2; NaNO3; HF
3. O2; CO(NH2)2; CH3OH
4. NH3; CH3COOH; HCN
5. H2SO4; NaOH; HCl
I would choose 2.
1. all strong electrolytes.
2. BaCl2 and NaNO3 are strong but HF is weak.
3. all non-elecrolytes.
4. all weak electrolytes.
5. all strong electrolytes.
Well, I must say, trying to find the "odd one out" among these groups is a bit like trying to find a clown with polka dots in a circus. But fear not, my dear inquirer, for I shall guide you through this riddle.
In Group 2, BaCl2, NaNO3, and HF are all strong electrolytes, meaning they break apart into ions in water and conduct electricity. But then we have HF, like a shy clown, being different from the rest. You see, HF is a weak electrolyte, meaning it only partially dissociates into ions in water. So, in this case, the answer is Group 2.
Now, wasn't that an electrifying exploration into the world of electrolytes and nonelectrolytes? Keep those questions coming, my friend!
To determine which group has one member that is not like the others, you need to identify if the substances in each group are strong electrolytes, weak electrolytes, or nonelectrolytes.
1. NaCl, Ca(OH)2, and HNO3 are all strong electrolytes since they ionize completely in water, producing ions that enable the solution to conduct electricity. There is no member that is not like the others in this group.
2. BaCl2 and NaNO3 are both strong electrolytes since they fully ionize in water. However, HF is a weak electrolyte because it only partially ionizes in water. Therefore, group 2 has one member that is not like the others.
3. O2 is a nonelectrolyte since it does not produce ions when dissolved in water. CO(NH2)2 is a weak electrolyte because only a fraction of it ionizes in water. CH3OH is a nonelectrolyte since it does not produce ions in water. There is no member that is not like the others in this group.
4. NH3 is a weak electrolyte because it only partially ionizes in water. CH3COOH is a weak electrolyte since it only partially ionizes in water. HCN is a weak electrolyte because it only partially ionizes in water. There is no member that is not like the others in this group.
5. H2SO4 is a strong electrolyte since it fully ionizes in water. NaOH is a strong electrolyte since it fully ionizes in water. HCl is a strong electrolyte since it fully ionizes in water. There is no member that is not like the others in this group.
Based on the analysis, the group with one member that is not like the others is group 2: BaCl2, NaNO3, and HF.
To determine the group that has one member which is not like the others, we need to analyze the substances in each group and identify their classification as either strong electrolytes, weak electrolytes, or nonelectrolytes.
First, let's understand the classifications:
- Strong electrolytes: These substances completely dissociate into ions when dissolved in water, conducting electricity well.
- Weak electrolytes: These substances partially dissociate into ions when dissolved in water, conducting electricity to a limited extent.
- Nonelectrolytes: These substances do not dissociate into ions when dissolved in water and do not conduct electricity.
Now, let's analyze each group:
1. NaCl; Ca(OH)2; HNO3
- NaCl: Strong electrolyte (ionic compound that fully dissociates)
- Ca(OH)2: Strong electrolyte (ionic compound that fully dissociates)
- HNO3: Strong electrolyte (a strong acid that fully dissociates)
All three substances in this group are strong electrolytes, so there is no member that is not like the others.
2. BaCl2; NaNO3; HF
- BaCl2: Strong electrolyte (ionic compound that fully dissociates)
- NaNO3: Strong electrolyte (ionic compound that fully dissociates)
- HF: Weak electrolyte (a weak acid that partially dissociates)
In this group, HF is a weak electrolyte, while the other substances are strong electrolytes. Thus, HF is the member that is not like the others.
3. O2; CO(NH2)2; CH3OH
- O2: Nonelectrolyte (a nonpolar compound that does not dissociate)
- CO(NH2)2: Nonelectrolyte (a covalent compound that does not dissociate)
- CH3OH: Nonelectrolyte (a covalent compound that does not dissociate)
All substances in this group are nonelectrolytes, so there is no member that is not like the others.
4. NH3; CH3COOH; HCN
- NH3: Weak electrolyte (a weak base that partially dissociates)
- CH3COOH: Weak electrolyte (a weak acid that partially dissociates)
- HCN: Weak electrolyte (a weak acid that partially dissociates)
All substances in this group are weak electrolytes, so there is no member that is not like the others.
5. H2SO4; NaOH; HCl
- H2SO4: Strong electrolyte (a strong acid that fully dissociates)
- NaOH: Strong electrolyte (ionic compound that fully dissociates)
- HCl: Strong electrolyte (a strong acid that fully dissociates)
All three substances in this group are strong electrolytes, so there is no member that is not like the others.
Based on our analysis, the group that has one member which is not like the others is Group 2, with the substances BaCl2, NaNO3, and HF.