In a mixture, substances generally retain their individual properties. Unlike in a chemical compound, where the constituents undergo chemical reactions and lose their original identities, the components of a mixture retain their distinct chemical properties.

Examples:

1. Salt and Water: When salt is dissolved in water to form a saltwater solution, the salt retains its saline taste, and water remains a liquid. The properties of individual components (salt and water) are preserved within the mixture.

2. Oil and Vinegar: In a salad dressing made by mixing oil and vinegar, both substances maintain their distinct characteristics. The oil remains oily and non-polar, while vinegar retains its acidic and polar nature.

3. Sugar and Sand: Combining sugar and sand results in a mixture where each substance keeps its original properties. Sugar remains sweet and soluble in water, while sand retains its gritty texture and insolubility.

However, it's worth noting that some physical properties of the mixture may change due to the interaction of the components. For instance, the boiling point or freezing point of a mixture might differ from its individual constituents.

In summary, substances within a mixture generally maintain their characteristic chemical properties, although the overall physical properties of the mixture may vary from the pure substances.