Exploring Solubility: Why Salts Dissolve in Water

The video explains the concept of solubility, focusing on why some substances dissolve in water while others do not. It begins with an introduction to solubility and the interaction between oil and water. The structure of the water molecule is explored, highlighting its polar nature. An experiment demonstrates water's polarity using a charged rod. The video then discusses how ionic compounds like sodium chloride dissolve in water due to their charged nature. Finally, it explains why nonpolar molecules, such as fats, do not dissolve in water, emphasizing the role of molecular structure in solubility.

What makes table salt dissolve in water?

• Its non-polar nature

• Its ionic bonds

• Its similarity to water molecules

• Its gaseous state

Why do oil and water not mix?

• Because oil is denser than water

• Because oil is polar

• Because oil is non-polar and does not form hydrogen bonds with water

• Because water is non-polar

What is the angle formed between the hydrogen atoms in a water molecule?

• 104.5 degrees

• 180 degrees

• 90 degrees

• 120 degrees

What is the charge distribution in a water molecule?

• Neutral with no charge

• Slightly positive on one side and slightly negative on the other

• Uniformly negative

• Uniformly positive

What experiment can demonstrate water's polar nature at home?

• Using a statically charged rod to attract a stream of water

• Mixing water with oil

• Freezing water into ice

• Boiling water

Why does sodium chloride dissolve in water?

• Because it is less dense than water

• Because it forms covalent bonds with water

• Because it is non-polar

• Because of its ionic nature and water's polarity

What type of bond is formed between sodium and chlorine atoms in table salt?

• Metallic bond

• Hydrogen bond

• Ionic bond

• Covalent bond

What happens when water is heated in terms of solubility?

• Decreases solubility of salts

• Has no effect on solubility

• Increases solubility of gases

• Increases solubility of salts

What property of water allows it to dissolve polar substances?

• Its non-polar nature

• Its ability to form hydrogen bonds

• Its colorless appearance

• Its high density

Why are fats insoluble in water?

• Because they have ionic bonds

• Because they are polar

• Because they are denser than water

• Because they are non-polar and do not mix with water's polar nature