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.

Intermolecular Forces

Lab Summary

Use a stainless steel temperature sensor to determine the effects of molecular size and shape on the strength of intermolecular forces for different alcohols within the same homologous series and between isomeric pairs.

Theory

Students determine the effects of molecular size and shape on the strength of intermolecular forces for different alcohols within the same homologous series and between isomeric pairs. Through this investigation, students:

  • Explain why evaporation causes a decrease in temperature.
  • Describe the relationship between evaporation rate and the strength of intermolecular forces of attraction among molecules.
  • Describe the relationship between the size of molecules in a homologous series and the strength of intermolecular forces of attraction between them.
  • Describe the influence the shape of a molecule has on its vapor pressure by comparing the evaporation rates of two isomeric alcohol pairs.

Method

Students conduct the following procedures:

  • Graph temperature versus time data for five alcohols from the same homologous series and two pairs of isomeric alcohols as they evaporate from a stainless steel temperature sensor.
  • Compare the rate of evaporation for the seven alcohols to determine the relative strengths of the intermolecular forces of attraction.

Sensors / Equipment Used:

PASPORT Chemistry Sensor

(PS-2170)

Allows students to measure Temperature, pH/ISE/ORP, Absolute Pressure & Voltage in one sensor. For use with PASPORT Interfaces.

Materials Used:

Graduated cylinder, 10-mL 
Test tube, 15-mm × 100-mm - 7
Test tube rack 
Stopper to fit test tube - 7
Wash bottle and waste container 
Masking tape, 6-cm strips - 2
Methanol - 5 mL
Ethanol - 5 mL
Propanol - 5 mL
Butanol - 5 mL
Pentanol - 5 mL
2-Propanol - 5 mL
2-Butanol - 5 mL

Your Bundle Options:

Option 1:

Chemistry Starter Sensor Bundle

(PS-2921)

A sensor bundle specifically designed to get you started using probeware in your chemistry lab. Also: perform 22 Lab Activities from Chemistry through Inquiry teacher guide.

Option 2:

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.