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Materials needed for each group: Chalk for each student Small piece of sand paper

Materials needed for each group: Chalk for each student Small piece of sand paper Small cup of vinegar per group Hand lenses. Management prior to lab:. Have chalk broken into small pieces and cut up the sandpaper into pieces large enough to hold.

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Materials needed for each group: Chalk for each student Small piece of sand paper

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  1. Materials needed for each group: • Chalk for each student • Small piece of sand paper • Small cup of vinegar per group • Hand lenses

  2. Management prior to lab: • Have chalk broken into small pieces and cut up the sandpaper into pieces large enough to hold. • The vinegar can diluted with water to slow the reaction down to make it more realistic.

  3. Procedure: • You are going to complete two activities that model how minerals can be weathered. • Distribute chalk and sandpaper. • Chalk is a soft sedimentary rock made of calcite and the sandpaper has the mineral quartz glued onto it. • Use your hand lenses and observe both the sandpaper and the chalk. • Record your observations in your journal.

  4. Now hold the sandpaper steady and carefully scrape the chalk across it. • Now observe what you notice about the chalk and the sandpaper. • Record your observations. • This is an example of “physical weathering”. • The sandpaper (quartz) is a harder mineral and scratched the softer mineral calcite (chalk). • In the natural world when sand is blown against rock, abrasion (cuts) occur on the rock. • Use the next slide for discussion questions.

  5. Now take the small cup of vinegar. • Place your piece of chalk into the vinegar. • Write your observations. • After 5 minutes your teacher will remove the vinegar to stop the reaction. • Draw and write what you see now. • We are going to now put the chalk back into the cup and see what happens over a period of time. • This activity models “chemical weathering”. • Use the next slide for discussion questions.

  6. Conclusion Statement • How are these experiences like the weathering on the Earth’s surface? • How are they different? • What are you wondering now?

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