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.
Mixture of sand
STEP 1
and white crystals
Small nails
Sand
STEP 2
White crystals
dissolved in water
Component 4B
Q1. What piece of equipment would the students need to do STEP 1?
STEP 3