Benchmark Question: How are mixtures separated into
their component parts?
Focus Question: What are the different strategies
for separating mixtures?
In small groups, students
will brainstorm types of mixtures (e.g., salt and pepper, sand and sugar,
iron filings and sand, rocks and wood chips, sugar or salt solutions) and
report their findings to the whole group. Using the students═ lists of
mixtures, evaluate the mixtures and predict the appropriate methods to
separate them into the original materials.
The teacher will provide the
materials, so students can make their own mixtures. Students will weigh
each material and record their measurements before preparing each mixture.
Students will weigh each mixture and record their measurements in a data
table with the following headings:
- Mixture form
- Method of separation
- Weight of original materials
- Weight of mixture
Students will choose
appropriate methods and tools (e.g., filter paper, funnels, magnets,
sieves, beakers, solar stills). Students will experiment with ways to
separate the mixtures into their original materials. Students will weigh
their mixtures before separating them and will record their measurements.
Students will compare the measurements of the original mixture to the
combined weight of the original materials.