* Compounds: Compounds are formed when two or more elements chemically combine in a fixed ratio. Breaking them down requires altering their chemical bonds.
* Example: Water (H₂O) is a compound formed from hydrogen and oxygen. You can't separate water into hydrogen and oxygen by filtering, distillation, or magnetism. You need to use electrolysis (applying an electric current) to break the chemical bonds and release the elements.
* Mixtures of compounds: Sometimes, you have mixtures where the components are chemically bonded, making physical separation impossible.
* Example: Salt (NaCl) dissolved in water. The salt is chemically bonded to the water molecules in solution. You can't simply evaporate the water to get pure salt back; you'd also need to break the chemical bonds holding the salt molecules together.
Why physical methods won't work:
* Physical methods: These rely on differences in physical properties like boiling point, density, magnetism, or particle size. They don't alter the chemical composition of the substances.
* Chemical methods: These involve breaking or forming chemical bonds, resulting in the creation of new substances.
Let me know if you'd like more specific examples or explanations!
