Determine if the following substances are soluble (at room temperature, 1 atm) in water or in hexane (:


grease and CS2

how do you know this

To determine whether a substance is soluble in water or hexane, we need to look at the nature of the substance and its interaction with the solvent.

1. Grease: Grease is a mixture of oils and fats. Most greases are not soluble in water because they are nonpolar substances and water is a polar solvent. The polar nature of water causes it to interact strongly with other polar molecules, like itself, but weakly with nonpolar molecules. Therefore, the nonpolar nature of grease makes it insoluble in water.

On the other hand, hexane is a nonpolar solvent. Nonpolar substances generally dissolve well in nonpolar solvents like hexane. Thus, grease is more likely to be soluble in hexane than in water.

2. CS2 (Carbon disulfide): CS2 is a nonpolar molecule because it is composed of two carbon atoms bonded to a sulfur atom, and the atoms have an equal share in the bonded electrons. As mentioned earlier, nonpolar substances tend to be soluble in nonpolar solvents. Therefore, CS2 is expected to be soluble in hexane.

In summary:
- Grease is insoluble in water but soluble in hexane.
- CS2 is expected to be soluble in hexane.

Please note that these predictions are based on the general solubility trends, and there may be other factors (such as temperature, concentration, or presence of other solutes) that could affect solubility.