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Component 4: Lesson Activity
Component 4A
What's in the bucket?
A group of high school students were playing on the beach and they found a small bucket with some
interesting materials. The students found that the bucket contained a lot of sand but also some small
nails, some large broken shells, and some white crystals.
The students wanted to find out what
the white crystal are. Their problem
was to separate the mixture of
materials in the bucket down to the
white crystals. They started by picking
out the large shells by hand. The
students drew the following flowchart
to help them work out what to do next.
Flowchart - separation of a mixture
Mixture of sand, small nails
and white crystals.
STEP 1
Mixture of sand
and white crystals
STEP 2
Small nails
Sand
White crystals
dissolved in water
STEP 3
​

Sagot :

Answer:

In Step 1 of the flowchart, the students separate the large broken shells from the mixture of sand, small nails, and white crystals by picking them out by hand. This leaves them with a mixture of sand and white crystals.

In Step 2, to separate the small nails from the mixture, the students can use a magnet. Magnetic materials like nails can be attracted to a magnet, allowing the students to easily remove them from the mixture. This will leave them with a mixture of sand and white crystals.

In Step 3, to separate the sand from the white crystals, the students can dissolve the mixture in water. The sand will sink to the bottom, while the white crystals will stay suspended or float in the water. The students can then carefully pour off the water, leaving behind the white crystals.

This stepwise process of separation allows the students to isolate the white crystals from the original mixture in the bucket.

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