Solubility Principles and Ionic Compounds

The video tutorial demonstrates the principle of 'like dissolves like' by showing how polar solvents dissolve polar solutes and non-polar solvents dissolve non-polar solutes. Water and hexane are used as solvents, while copper(II) chloride and iodine are the solutes. The video explains the molecular structure of water and hexane, highlighting why water can dissolve ionic compounds like sodium chloride. It also touches on the concept of London dispersion forces for non-polar substances. The experiment is conducted in a fume hood, and observations are made on the solubility of iodine and copper chloride in water and hexane.

What principle is demonstrated by the phrase 'like dissolves like'?

• Polar solvents dissolve non-polar solutes.

• Polar solvents dissolve polar solutes.

• All solvents dissolve all solutes.

• Non-polar solvents dissolve polar solutes.

Why is water considered a polar molecule?

• It has a uniform charge distribution.

• It has a positive end and a negative end.

• It has no charge.

• It is made up of charged ions.

How does water dissolve ionic compounds?

• By evaporating the ions.

• By attracting ions with its partial charges.

• By forming covalent bonds with ions.

• By breaking down into ions.

What characteristic of hexane makes it non-polar?

• It forms ionic bonds.

• It is surrounded by hydrogen atoms.

• It has a positive and a negative end.

• It has a high density.

What is the purpose of conducting the experiment in a fume hood?

• To maintain a constant temperature.

• To prevent contamination of the samples.

• To avoid inhaling hexane vapors.

• To enhance the reaction speed.

What happens when iodine is added to hexane?

• It forms a precipitate.

• It does not dissolve.

• It reacts with hexane.

• It dissolves immediately.

Why does copper(II) chloride not dissolve in hexane?

• Copper(II) chloride is too dense.

• Hexane is non-polar and copper(II) chloride is ionic.

• Copper(II) chloride is non-polar.

• Hexane is a polar solvent.

What is observed when both iodine and copper(II) chloride are added to the same test tube?

• Neither dissolves.

• Both dissolve in water.

• Iodine dissolves in hexane, copper(II) chloride in water.

• Both dissolve in hexane.

What is the density of hexane compared to water?

• Lower than water.

• Equal to water.

• Higher than water.

• Density does not affect solubility.

What is the main takeaway from the experiment regarding solubility?

• Solubility is independent of solvent type.

• Non-polar substances dissolve in polar solvents.

• Like dissolves like: polar with polar, non-polar with non-polar.

• All substances dissolve in water.