Compounds
* Fixed Composition: Compounds are formed when two or more elements chemically combine in a fixed ratio. This ratio is always the same, regardless of how the compound was made. For example, water (H₂O) always has two hydrogen atoms for every one oxygen atom.
* New Substance: A compound is a new substance with properties different from its constituent elements. For example, salt (NaCl) is a white, crystalline solid, while sodium (Na) is a soft, silvery metal and chlorine (Cl) is a toxic green gas.
* Chemical Change: The formation of a compound involves a chemical change, where atoms are rearranged and new bonds are formed. This change requires energy input.
* Separation Difficult: Separating the components of a compound requires chemical reactions to break the bonds holding the atoms together.
Mixtures
* Variable Composition: Mixtures can have varying proportions of their components. For example, you can have a sugar-water mixture with more or less sugar.
* No New Substance: The components of a mixture retain their original properties. In a sugar-water mixture, you can still taste the sugar and the water remains liquid.
* Physical Change: Mixtures are formed by a physical change, where no new bonds are formed. This change can be achieved by simply mixing the substances together.
* Separation Easy: The components of a mixture can often be separated by simple physical means like filtration, evaporation, or magnetism.
Here's a simple analogy:
Imagine building with Legos.
* Compound: You take different colored Lego bricks and chemically "bond" them together to create a unique object, like a spaceship. The spaceship is now a new entity, and you can't easily separate the bricks without breaking the "bonds."
* Mixture: You simply put different colored Lego bricks in a bucket. Each brick still maintains its individual color and properties. You can easily separate them back out.
In summary: Compounds are chemically bonded substances with fixed ratios and unique properties, while mixtures are physical combinations with variable ratios and components retaining their original properties.
