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🧲 Separating Mixtures

Muddy water, salty water, iron in sand — every mixture can be split apart. Master filtering, sieving, evaporating, and magnets.

lessons

~15 min

to learn

🔬 Science

subject

Ages 6–12

level

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What you’ll learn

Mixtures All AroundUnderstand that a mixture is materials jumbled together that each stay themselves and can be separated.A mixture is two or more materials stirred together where each stays itself and nothing new is made. Because they are not joined for good, mixtures can always be separated by the right method.
Ways to SeparateDescribe how sieving, filtering, using a magnet, and evaporating each separate a mixture.Sieving catches big pieces while small ones fall through. Filtering traps a solid and lets liquid drip through. Magnets pull out iron and steel. Evaporating removes the water to leave a dissolved solute behind.
Which Method?Choose the best separating method for a given mixture by looking at its parts.Pick a method to fit the mixture: filter an insoluble solid from a liquid, sieve big from small solids, use a magnet for magnetic metals, and evaporate to recover a dissolved solute.

Questions this course answers

What is true about a mixture?

In a mixture each material keeps being itself, so mixtures can always be separated again.

You want to get clear water out of muddy water. Which method works?

Filtering lets the water drip through tiny holes in the paper while the mud is trapped on top.

Which mixture is best separated with a magnet?

Iron is magnetic, so a magnet lifts the iron filings out of the sand while the sand stays put.

How do you get salt back from salty water, since it is dissolved?

The dissolved salt is too small to filter or sieve. Evaporating the water leaves the salt behind as crystals.

Which separating method uses paper with tiny holes?

Filtering uses filter paper with holes too small to see, letting liquid through and trapping the solid.

To pick the best method, what should you look at first?

Choosing a method depends on the pieces: big and small solids suit sieving, magnetic metals suit a magnet, and dissolved solutes suit evaporating.

Grounded in trusted sources

Royal Society of Chemistry
BBC Bitesize
Britannica Kids
American Chemical Society

Every Wunder lesson is built from real, reputable sources — never invented.

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