To separate things that are mixed, find one way in which they differ. Size, magnetism, whether they dissolve, boiling point.
Soybeans, red beans and millet are mixed up
A board to adjust
Separate the three with two sieves. The hole sizes have to be right.
Iron filings are mixed into sand
A board to adjust
Lower the magnet.
Can the salt be got back out of salt water?
A board to adjust
This is salt water with sand in it. Press the buttons in order.
From here things are separated by boiling point
What comes next in middle school · the characteristics of substances
Whichever boils first
Above, you drove off the water and kept the salt. But what if both are liquids? When water and alcohol are mixed, their different boiling points are used.
Water and alcohol are mixed
A board to run
Heat it and watch the temperature. It stops twice.
