NGSS - HS PS1 -3

Summary

The video presents a student investigation into whether water or acetone is more effective at removing different stains from fabric. The fabric has stains from watercolor paint, oil paint, nail polish, and correction fluid.

Students are asked to design an experiment using the available equipment, which includes measuring cylinders, measuring tools, a compass, a ruler, and cotton-wheel applicators.

Investigation and assignment

Students are instructed to:

• Formulate a testable question comparing the stain-removing abilities of water and acetone.
• Identify the variable they will change and the outcome they will measure.
• Draw or describe their experimental setup on the class template.
• List 10 factors to keep constant to ensure a fair comparison.
• Predict the results based on their knowledge of the substances.
• Submit their written or typed experiment through PowerSchool.

Follow-up analysis

The assessment also asks students to:

• Explain why they expect water and acetone to produce different results, using drawings, models, or diagrams if helpful.
• Compare the substances using concepts from the unit, including polarity, types of atoms, molecular structure, evaporation, and intermolecular and intramolecular bonds.
• Use the rubric on the back of the assignment to assess how their work aligns with the standard and how it could exceed expectations.

Speaker and source

• Teacher/instructor: Gives the investigation instructions and explains the assignment and assessment criteria.