Make a general statement of how substances in a mixture can be separated

Answer

Depends on type of mixture. But I think separating the different sized particles through filtration would be a sufficient answer for middle school level unless they have taught you about other mixtures.

Explanation:

Hey,

There are thousands of way to separate mixtures. Each way is specific to the type of mixture. If the mixture is homogeneous processes like distillation can be employed. For heterogeneous mixture filtration can be used to separate particles of different sizes.

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

the volume increases