Featured in PASCO’s Chemistry through Inquiry Teacher Guide
Features over 25 inquiry based labs covering the fundamental concepts of lab skills, structure & properties of matter, chemical reactions and more.
Ionic & Covalent Compounds
Use a conductivity sensor to determine if an unknown substance is an ionic, polar covalent, or non-polar covalent compound based on its physical properties.
Determine if an unknown substance is an ionic, polar covalent, or non-polar covalent compound based on its physical properties. Through this investigation, students:
- Review physical properties, including conductivity, solubility, hardness, and melting point.
- Determine differences in physical properties for ionic and molecular covalent compounds.
- Explain the differences between intramolecular and intermolecular forces.
Students conduct the following procedures:
- Test the conductivity, solubility, hardness, and melting point of ionic, polar covalent, and non-polar covalent compounds.
- Identify an unknown substance as an ionic, polar covalent, or non-polar covalent compound.
Sensors / Equipment Used:
PASPORT Conductivity Sensor
Utilizes platinum probes for greater range and improved accuracy in high & low concentrations.
Graduated cylinder, 10-mL
Test tube, 15-mm × 100-mm - 5
Test tube rack
Stopper to fit test tubes - 3
Aluminum foil squares, 5-cm × 5-cm - 6
Wash bottle and waste container
Distilled (deionized) water - 30 mL
Table salt (sodium chloride) - 1 g
Table sugar (sucrose) - 1 g
Paraffin wax - 1 g
Unknown A (use glucose) - 1 g
Unknown B (use crayon pieces) - 1 g
Unknown C (use potassium chloride) - 1 g
The Associated Bundle:
Contains the sensors and probes needed to perform all 17 experiments in the Advanced Chemistry Teacher Guide and all 25 labs in the Chemistry through Inquiry Guide.