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Seperating Mixtures and Solutions
Transcript of Seperating Mixtures and Solutions
6 Methods of Separating Mixtures and Solutions
1. Pick Out Pieces
Using a strainer allows liquids (or smaller pieces) to fall through the holes, while larger pieces stay in the bowl.
If one of the materials in the mixture is made with iron, use a magnet to separate it
Magnetism in the real world:
Try it: Total cereal has alot of iron in it- put some in a sealed bag with water. Let it get soggy. Slowly rub a magnet around the outside of the bag, and look for small, black bits of iron in the bag!
In a junkyard, giant electromagnets attached to cranes use magnetism to draw out objects made of iron so they can be recycled.
Sifting in the real world:
Draining the water from the noodles when making spaghetti
In cheese-making: sifting out whey (milk product) from the solid cheese
"Picking out" the real world:
Picking out ingredients you don't like from a salad
Separating the bad fruit from the good in a fruit distribution center.
1. Pick Out the Pieces by Hand
When pieces are large enough, use hands or tongs to pick them out.
If some materials float in water, and others do not, add water to the mixture. Once materials float to the top, they can be collected.
When a solid is mixed with a liquid, but it does NOT dissolve, use a filter- the holes are too small to be seen- the liquid will pass through and trap the solid inside the filter.
When a solid is dissolved in a liquid (a solution is formed), you can let the liquid evaporate out, leaving the solid left behind
Filtration in the real world:
Making coffee- the coffee grounds are put in a filter; the hot water passes through the filter, dissolving some coffee. The coffee/water goes through, and the solid coffee particles remain in the filter.
Air conditioners have a filter that traps dust and dirt so that air is cleaner.
Floatation in the real world:
To remove extra fats from chicken soup, let it cool. The fat will float to the top and can be skimmed off.
Water treatment... some waste water has floating particles (It's a dirty job, but someone's gotta do it!)
Evaporation in the real world:
Paint is made of colored particles dissolved into water. As the paint dries, the water evaporates, leaving the colored particles on the wall.
Ocean water is separated into salt and water through evaporation. The salt can be processed to sell. There are ways to trap the evaporated water vapor, let it condense back into a liquid, and be used as fresh water too!
Making Rock Candy!