How can we separate mixtures into pure substances?

Science

How many types of particle are there in a  mixture?

Iron cannot be separated from sand using a magnet.

Sand particles are larger than iron particles.

Why can iron filings be separated from sand using a magnet?

How can salt be separated from water when it is dissolved?

A mixture of two or more different substances.

Which of the following are formulations? Pick 2 correct answers.

Does the amount of each substance in the formulation need to be equal?

Does the proportion of each substance need to be the same each time the formulation is made?

Double the amount of the most important substances.

If you want to make double the amount of formulation what do you need to do?