Lesson · Grade 6 · Science
Sieves and Filters: Separating a Mixture by Particle Size
- Grade 6
- Science
- 1 min 2 s
- British Columbia
- BC6-SC-08
A mixture of pebbles, sand and water is poured through a sieve and then filter paper. The pebbles are too big for the sieve's holes, and the sand grains are too big for the paper's tiny holes, but the water particles pass through. The sand left in the paper is named the residue and the water collected below is the filtrate, ending on the idea that big particles stay and small ones pass through.
Concept: Separating a mixture by particle size
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In one sentence
The question this lesson answers
How can we separate a mixture of pebbles, sand and water?
The pebbles are big, the sand grains are small, and the water particles are far too tiny to see.
Transcript
What the lesson says
How can we separate a mixture of pebbles, sand and water?
The pebbles are big, the sand grains are small, and the water particles are far too tiny to see.
We hold a sieve above a funnel lined with filter paper.
The sieve is a mesh with holes big enough to see.
Filter paper has holes that are far too tiny to see.
We pour in the mixture, and the pebbles are too big to fit through the sieve.
The sand grains and the water are small enough to fall through.
But the sand grains are too big to pass through the filter paper.
The tiny water particles pass through the paper and drip into the beaker.
The solid left behind in the filter paper is called the residue.
The liquid that passes through the filter is called the filtrate.
In a sieve or a filter, big particles stay behind and small ones pass through.
Curriculum
Where this fits
The outcomes and strands follow the British Columbia curriculum.
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