Answers section
Questions 2.4a
- What difference between sand and iron does this separation rely on? ----
- Suggest a name for this method of separation. ------------------------
- Which other substances behave in the same manner as iron? ---------------
- Name two other binary mixtures, with iron filings as a component, which can be separated using this method.
Answers to Questions 2.4a
- Iron filings are magnetic; sand is not.
- Magnetic picking.
- Steel (plus nickel and cobalt, which are rare)
- Sulphur and iron filings; carbon and iron filings, sodium chloride and iron filings (any loose non-magnetic material with iron filings).
Notes
Use of a magnet to separate magnetic from magnetic materials is called magnetic picking. It cannot be used to separate mixtures of magnetic materials or non-magnetic materials only.