Featured in PASCO’s Chemistry through Inquiry Teacher Guide

Chemistry through Inquiry Teacher Guide

(PS-2871C)

Features over 25 inquiry based labs covering the fundamental concepts of lab skills, structure & properties of matter, chemical reactions and more.

Ionic & Covalent Compounds

Lab Summary

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.

Theory

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.

Method

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

(PS-2116A)

Utilizes platinum probes for greater range and improved accuracy in high & low concentrations.

Materials Used:

Hot plate 
Graduated cylinder, 10-mL 
Test tube, 15-mm × 100-mm - 5
Test tube rack 
Stopper to fit test tubes - 3
Spatula 
Tongs 
Aluminum foil squares, 5-cm × 5-cm - 6
Masking tape 
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:

Chemistry Standard Sensor Bundle

(PS-2927C)

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.

Interface Required

This experiment may require software and an interface for data collection.