Our Lab Experiment 1

1. EXPERIMENT 1
INTERMOLECULAR FORCESOF ATTRACTION

2. 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.

3. A. A comparison of liquids (reaction of test liquids to charged objects)
Test Liquid Observations
water The flows of water bends
ethanol Nothing happen
kerosene Nothing happen
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 waxed
paper is circular shape.

4. The blade test
Test Liquid Observations
Kerosene The blade sinks faster.
Deteregent The blade sink gently.
Water The blade floats on water.
C. Ice and Liquids Water ( volume comparison of ice and liquid water).
OBSERVATION
Initial volume
(mL)
400 mL Us our observation to the water
with ice that has been melted,
Final Volume nothing changes to the volume.
(mL)
400 mL
Volume
difference (mL)
0 mL

5. 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.

6. Questions
 Briefly explain your observations in part I.
-The flow of the water bends while the ethanol and
kerosene is nothing happened.

7. Questions
 Why do liquids assume different shapes on the
surface of the waxed of the waxed paper?
-The water reacts faster than the kerosene.

8. 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.

9. 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.

10. Questions
 Explain why ice float on water.
-because ice is less denser than liquid water so the ice
float on water.

11. 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.

12. 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.