* "Like dissolves like": This is a key principle in chemistry. Polar substances (those with uneven charge distribution) dissolve well in other polar substances (like water). Non-polar substances (evenly distributed charge) dissolve well in other non-polar substances.
* Water is polar: Water has a bent shape, with a slightly positive side (near the hydrogens) and a slightly negative side (near the oxygen). This makes it a polar molecule.
Examples of Compounds That Cannot Mix Well with Water (Immiscible)
* Oils and fats: These are non-polar substances and tend to clump together rather than dissolving in water.
* Gasoline: This is a mixture of non-polar hydrocarbons.
* Many organic solvents: Examples include hexane, toluene, and chloroform.
Important Note: While some compounds are considered "immiscible" (don't mix), it's worth knowing that even "immiscible" substances can still dissolve to a *very* small extent.
