* No New Substance is Formed: When you mix salt and sugar, you're simply combining two distinct substances. They don't chemically react to create a new compound.

* Easily Separated: You can easily separate salt and sugar by using techniques like dissolving the sugar in water (salt will remain undissolved) and then evaporating the water to recover the sugar.

* Individual Properties Remain: The salt still tastes salty, and the sugar still tastes sweet. Their individual properties are retained within the mixture.

Therefore, a mixture of salt and sugar is a heterogeneous mixture because the components remain distinct and can be easily separated.