Glucose:
* Polar molecule: Glucose has many hydroxyl (-OH) groups, making it a polar molecule. This means it has a slightly positive end and a slightly negative end due to uneven electron distribution.
* Hydrogen bonding: The hydroxyl groups in glucose can form hydrogen bonds with water molecules, which are also polar. Hydrogen bonds are strong attractive forces between molecules.
Petrol (Gasoline):
* Non-polar molecule: Petrol is composed of hydrocarbons, which are non-polar molecules. This means they have an even distribution of electrons, with no significant positive or negative ends.
* Weak intermolecular forces: Hydrocarbons in petrol primarily interact through weak Van der Waals forces, which are much weaker than hydrogen bonds.
Solubility:
* Like dissolves like: The principle of "like dissolves like" states that polar substances dissolve in polar solvents, and non-polar substances dissolve in non-polar solvents.
* Water: Since glucose is polar and water is polar, they can interact through strong hydrogen bonds, leading to glucose dissolving in water.
* Petrol: Glucose cannot form strong interactions with the non-polar hydrocarbons in petrol. The weak Van der Waals forces are insufficient to overcome the strong hydrogen bonding within glucose molecules themselves.
In summary: Glucose's polarity and ability to form hydrogen bonds with water make it soluble in water but not in petrol. Petrol, being non-polar, cannot form strong interactions with the polar glucose molecule.
