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Mixtures Study Lab

A mixture is formed when two or more substances mix together without undergoing a chemical reaction.

1. Heterogeneous Mixtures

The properties of a mixture differ depending on the materials used:

• Sand grains – irregular fine particles
• Salt – fine cubic crystals
• Mustard seeds – small round yellow seeds
• Rice grains – larger elongated grains

2. Mixing & Stirring

Stirring distributes the particles among each other. No chemical change occurs — components stay separate.

3. Key Observations

• Different sizes & shapes → visible layering or mixing
• Can be separated again by physical methods
• Stirring makes it look more uniform temporarily

4. Common Examples

• Sand + Salt
• Rice + Mustard seeds
• Grains + small stones / pulses + chaff