1. Composition:

- Mixtures: are combinations of two or more substances that are not chemically bonded. The components of a mixture retain their individual chemical identities and can be separated by physical means, such as filtration, chromatography, or distillation.

- Compounds: are substances composed of two or more elements that are chemically bonded. The atoms or molecules in a compound are held together by chemical forces and form a new, distinct substance with its unique properties. Compounds cannot be separated into their constituent elements by physical means alone.

2. Proportions:

- Mixtures: can have varying proportions of their components. The composition of a mixture can change without altering its fundamental properties.

- Compounds: have fixed and definite proportions of their constituent elements. The relative amounts of elements in a compound are determined by its chemical formula and cannot be changed without changing the compound's identity.

3. Properties:

- Mixtures: exhibit a combination of the properties of their individual components. The physical properties of a mixture, such as boiling point, melting point, and density, are influenced by the properties of its constituent substances.

- Compounds: have unique and distinct properties that differ from those of their individual elements. The properties of a compound are determined by the chemical bonding and interactions between its atoms or molecules.

4. Chemical Reactivity:

- Mixtures: do not undergo chemical reactions when mixed together. The components of a mixture retain their chemical properties and do not form new substances upon mixing.

- Compounds: undergo chemical reactions when their constituent elements or molecules interact and form new chemical bonds. Chemical reactions result in the formation of new compounds with different properties than the starting materials.

In summary, mixtures are combinations of substances that are not chemically bonded and can be separated physically. Compounds are substances composed of chemically bonded elements in fixed proportions and have distinct properties. Mixtures exhibit the properties of their components, while compounds have unique properties resulting from chemical bonding.