EXPERIMENT 1

INTERMOLECULAR FORCESOF ATTRACTION

OBJECTIVES:

1. Compare some physical properties of water with those of other liquids

2. Associate the difference in the properties of the liquids to the types and strength of intermolecular forces existing between molecules.

Test Liquid Observations

water The flows of water bends

ethanol Nothing happen

kerosene Nothing happen

A. A comparison of liquids (reaction of test liquids to charged objects)

B. Surface tension ( appearance of liquids on the surface of waxed paper)

Test Liquid Observations

Water It’s absorb water and forms irregular shape.

Kerosene The form of kerosene in a waxedpaper is circular shape.

Test Liquid Observations

Kerosene The blade sinks faster.

Deteregent The blade sink gently.

Water The blade floats on water.

The blade test

OBSERVATION

Initial volume (mL)

400 mL Us our observation to the water with ice that has been melted,

nothing changes to the volume.Final Volume(mL)

400 mL

Volumedifference (mL)

0 mL

C. Ice and Liquids Water ( volume comparison of ice and liquid water).

Questions Using the results in Table 1.1, identify the IMFA

present in water, ethanol and kerosene.

-water is hydrogen bond, ethanol is dipole dipole, and kerosene is london dispersion.

Questions Briefly explain your observations in part I.

-The flow of the water bends while the ethanol and kerosene is nothing happened.

Questions Why do liquids assume different shapes on the

surface of the waxed of the waxed paper?

-The water reacts faster than the kerosene.

Questions Based on the results obtained in Part II on the

blade test, what happens when the blade was placed on the surface of water? Kerosene? Why?

-The blade floats in water because the horizontal blade has more area than vertical. While the blade sink in kerosene because there is not enough IMFA to carry out the blade to float.

Questions What happens when the blade was placed on the

detergent solution? What is the effect of the detergent on the IMFA of water?

-It’s because the detergent is viscous w/c the blade sinks slow. IMFA affects the viscosity of the solution.

Questions Explain why ice float on water.

-because ice is less denser than liquid water so the ice float on water.

Questions Compare the initial and final volumes in Part III.

Account for any difference.

-Well to our observation, the volume of the water remain the same.

Questions Identify other properties of compounds that are

affected by the strength of intermolecular forces. Discuss briefly.

-IMFA affects the other properties of cmpound such as boiling point because the higher IMFA the harder it boils the compound.