Homogeneous & Heterogeneous Mixtures

  

Class IX- Chapter 5- Exploring Mixtures and their Separation – I

HANDOUT: Homogeneous & Heterogeneous Mixtures (Grade 9)

1.      Mixture -

A mixture is formed when two or more substances are physically combined. The substances do not lose their individual properties.

Types of Mixtures

• a) Homogeneous Mixture:
• ·       Composition is uniform throughout
• ·       Components are not visible
• ·        Appears as a single phase   

         Examples: Salt + Water, Sugar solution, Air

b) Heterogeneous Mixture:                                                     

• ·       Composition is non-uniform

  
• ·       Components are visible
• ·       Contains two or more phases
  Examples: Oil + Water, Sand + Water, Soil

E

3.      Differences at a Glance

Property	Homogeneous	Heterogeneous
Composition	Uniform	Non-uniform
Phases	One	Two or more
Visibility	Not visible	Visible
Example	Salt solution	Oil + water

4.     Activity Time

Aim: To identify types of mixtures                     

Materials: Water, salt, sand, 2 glasses

Steps:

1. Add salt to the water and stir

2. Add sand to water in another glass

Observation:

Salt disappears → __________ mixture

Sand settles → __________ mixture

5.     Think & Answer

1. Define a homogeneous mixture.

2. Give one example of a heterogeneous mixture.

3. Why is air considered homogeneous?

4. Identify the type of mixture:

   a) Fruit salad → __________

   b) Sugar solution → __________

6.     Key Tip

If you see only one phase → Homogeneous

If you see different parts → Heterogeneous