* Compounds: Compounds are formed by the chemical combination of two or more elements. These can be broken down into their constituent elements through chemical reactions.
* Water (H₂O): Electrolysis can decompose water into hydrogen and oxygen gas.
* Salt (NaCl): Electrolysis can decompose salt into sodium and chlorine.
* Sugar (C₁₂H₂₂O₁₁): Heating with a strong acid can decompose sugar into carbon, water, and other byproducts.
* Mixtures: While not strictly "decomposed", some mixtures can be separated into their components through chemical reactions.
* Crude oil: Fractional distillation uses differences in boiling points to separate crude oil into gasoline, kerosene, diesel, and other components.
Here are some substances that are difficult or impossible to decompose by chemical means:
* Elements: Elements are the simplest pure substances and cannot be broken down further by chemical means.
* Gold (Au)
* Iron (Fe)
Let me know if you'd like more specific examples!
