It's a bit tricky to answer this question without more context, but here's a breakdown of how properties change when components form mixtures and compounds:

Mixtures:

* Components retain their individual properties: In a mixture, the substances that make it up (the components) are simply physically combined. They don't chemically change. For example, in a mixture of sand and salt, the sand particles still have the properties of sand, and the salt particles still have the properties of salt.

* Properties are a blend of the components: The overall properties of a mixture are often an average or blend of the properties of its components. For example, the color of a mixture of sand and salt might be a pale yellowish-white, blending the colors of the sand and the salt.

Compounds:

* New properties emerge: When substances form a compound, they undergo a chemical reaction. The atoms of the original substances rearrange and bond together in a new way, creating a completely new substance with new properties. For example, when sodium (a soft, silvery metal) reacts with chlorine (a greenish-yellow gas), they form sodium chloride (table salt), a white crystalline solid with very different properties from either sodium or chlorine.

* Properties are not simply a blend: The properties of a compound are not a simple blend of the properties of its constituent elements. The compound has its own unique set of properties, often very different from the elements that make it up.

In summary:

* Mixtures: Components retain their individual properties, and overall properties are a blend.

* Compounds: New properties emerge that are not simply a blend of the components.

Important Note: There are some exceptions to this general rule, such as when a mixture exhibits a change in physical state (like a solution) or when a compound forms a new phase with different properties.