Question

Rank the following 4 compounds in order of lowest to highest freezing point.

1) NaF, F2, HCl, HF
2) F2, NaF, HCl, HF
3) HF, HCl, NaF, F2
4) HCl, HF, F2, NaF

Answer 1

The correct ranking of the compounds in order of lowest to highest freezing point is: NaF, F2, HCl, HF.

Step-by-step explanation:

The freezing point of a substance is influenced by the presence of solutes in a solution. The greater the concentration of solute particles, the lower the freezing point will be. When ranking the compounds in order of lowest to highest freezing point, we need to consider the number of solute particles each compound will dissociate into when dissolved in water.

So, the correct ranking is:

1. F2: This is a covalent compound that does not dissociate into ions in water, so it has the highest freezing point.
2. HCl: This compound dissociates into H+ and Cl- ions in water, resulting in a higher freezing point than F2.
3. HF: Similar to HCl, HF also dissociates into ions in water, giving it a higher freezing point than HCl.
4. NaF: This compound dissociates into Na+ and F- ions in water, resulting in the lowest freezing point among the four compounds.