Question

Identify the possible intermolecular force attraction in the following:

a. NaCl ------ H2O _________________________________
NH3 ------ NH3 _________________________________
H2S ------- H2S _________________________________
O2 ------- O2 _________________________________
HCl ------ HCl _________________________________
CH3OH ------ CH3OH _________________________________
H2 ---------- H2 _________________________________
Na2S ------ HCl _________________________________
Br2 ------- Br2 _________________________________
H2O ----- H2O​

Answer 1

Answer:

These are the possible intermolecular forces of the following:

1. NaCI-H2O-Ion-dipole

2. NH3-NH3-hydrogen bond

3. H2S-H2S-Dipole-dipole

4. O2—O2- London dispersion forces

5. HCI-HCI-Dipole-dipole

6. CH3OH-CH3OH-hydrogen bond

7. H2-H2-London dispersion forces

8. Na2S-HCI-ion-dipole

9. Br2-Br2- London dispersion forces

10. H2O-H2O-Hydrogen bond

Answer 2

Answer:

1. NaCI-H2O=Ion-dipole

2. NH3-NH3=hydrogen bond

3. H2S-H2S=Dipole-dipole

4. O2-O2=London dispersion forces

5. HCI-HCI=Dipole-dipole

6. CH3OH-CH3OH=hydrogen bond

7. H2-H2=London dispersion forces

8. Na2S-HCI=ion-dipole

9. Br2-Br2=London dispersion forces

10. H2O-H2O=Hydrogen bond

Explanation:

• An ion-dipole intermolecular force of attraction is an attractive force that results in an attraction between an ion and neutral molecule which has a dipole. (NaCl is an ion with Na+ and Cl- with H2O as a neutral molecule)
• The dipole-dipole intermolecular force of attraction is an attractive force between the positive end of one polar molecule and the negative end of another polar molecule. ( H2S-H2S, HCI-HCI)
• London dispersion forces is a temporary attractive force due to the formation of temporary dipoles in a nonpolar molecule. (Br2-Br2, H2-H2, O2-O2)
• A hydrogen bond is an intermolecular force that forms a special type of dipole-dipole attraction when a hydrogen atom bonded to a strongly electronegative atom exists in the vicinity of another electronegative atom with a lone pair of electrons. (NH3-NH3, CH3OH-CH3OH, H2O-H2O)