A compound is simply two or more elements chemically bonded
For Examlpe: Hydrogen + Oxygen = Water
H(g) + O(g) = H2O
because the properties differe
dirt is a mixture
yes, the first: mixture of compounds.
Yes, both are material.
The components of a mixture can be separated by purely physical means whereas a compound can only broken into its components by chemical means. Physical means can be separation by simply sorting out...