- Elements: Pure substances made of only one type of atom; cannot be broken down into simpler substances by chemical means (e.g., oxygen, gold, iron).
- Compounds: Pure substances formed when two or more different elements are chemically bonded in fixed proportions; can be broken down into simpler substances by chemical reactions (e.g., water H₂O, sodium chloride NaCl, carbon dioxide CO₂).
- Mixtures: Combinations of two or more different substances that are not chemically bonded; components retain their individual properties and can be separated by physical means (e.g., saltwater, air, trail mix).
Parent Tip: Review the logic above to help your child master the concept of elements compounds worksheet.
