what is the diffrence between substance and mixtures?

Answer 1

A mixture is when two or more substances are mixed, or put together, but are not chemicaly combined. A substance is what the mixture is being made of. I hope this helps!

Answer 2

A substance is a single chemical compound, like sugar or salt or water. A mixture is a combination of two or more different compounds, for example, sugar dissolved in water. A mixture can by separated by physical means into its components. So, the sugar water solution can be separated by evaporating off the water and leaving the sugar behind. A single substance cannot be separated without a chemical reaction.