Chemistry Worksheet on Unit 3
1. Which of the following intermolecular forces exists in all molecules,
regardless of their polarity?
a) Dipole-dipole interactions
b) Hydrogen bonding
c) London dispersion forces
d) Covalent bonding
2. Which factor increases the strength of London dispersion forces?
a) Decreasing molecular mass
b) Increased branching
c) Increased number of electrons
d) Lower boiling point
3. Why does NH₃ have a higher boiling point than PH₃?
a) PH₃ has weaker London forces
b) NH₃ exhibits hydrogen bonding
c) PH₃ has higher molecular mass
d) NH₃ has a larger atomic radius
4. Which of the following molecules exhibits the strongest hydrogen
bonding?
a) HCl
b) HF
c) CH₄
d) CO₂
5. The viscosity of a liquid depends on:
a) Intermolecular forces
b) Molecular weight only
c) The shape of the molecules only
d) The number of atoms in a molecule
6. Which of the following has the highest vapor pressure at room
temperature?
a) CH₃OH
b) C₂H₅OH
c) C₃H₇OH
d) CH₄
7. Why does ice float on water?
a) Ice is denser than liquid water
b) Hydrogen bonds hold water molecules in an open structure
c) Ice has weak dipole-dipole interactions
d) Water molecules in ice are randomly arranged
8. Which intermolecular force is primarily responsible for the high surface
tension of water?
a) Dipole-dipole interactions
b) Hydrogen bonding
c) London dispersion forces
d) Covalent bonding
9. Why does ethanol mix well with water but hexane does not?
a) Hexane is nonpolar, ethanol is polar
b) Ethanol has stronger London dispersion forces
c) Hexane forms hydrogen bonds
d) Water repels ethanol
10. The capillary action of water is caused by:
a) Hydrogen bonding only
b) Cohesion and adhesion forces
c) Dipole-dipole interactions
d) High vapor pressure
11. Which of the following molecules has no dipole moment?
a) NH₃
b) CO₂
c) H₂O
d) CH₃Cl
12. Which property is affected by the strength of intermolecular forces?
a) Electrical conductivity
b) Bond dissociation energy
c) Melting and boiling points
d) Atomic radius
13. The meniscus shape of water in a glass tube is due to:
a) Gravity
b) Adhesion and cohesion
c) The weight of the liquid
d) Van der Waals forces
14. A liquid with strong intermolecular forces will have:
a) High vapor pressure
b) Low boiling point
c) High viscosity
d) Weak surface tension
15. Which of the following molecules has the strongest London dispersion
forces?
a) CH₄
b) C₄H₁₀
c) C₂H₆
d) CO₂
16. Which of the following increases as intermolecular forces increase?
a) Volatility
b) Vapor pressure
c) Melting point
d) Evaporation rate
17. Which of the following decreases as hydrogen bonding increases?
a) Boiling point
b) Surface tension
c) Vapor pressure
d) Viscosity
18. The density of ice is lower than that of liquid water because:
a) Ice has a crystalline structure with open spaces
b) Ice molecules are closer together
c) Water molecules have greater kinetic energy
d) Ice contains fewer hydrogen bonds
19. Which molecule is expected to have the highest boiling point?
a) HCl
b) CH₄
c) NH₃
d) CO₂
20. Which of the following liquids would exhibit the highest capillary rise?
a) One with strong hydrogen bonding
b) One with weak dipole-dipole forces
c) A liquid with only dispersion forces
d) A liquid with high vapor pressure
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Metallic Bonding & Hybridization (20 Questions)
21. What is the main characteristic of metallic bonding?
a) A sea of delocalized electrons
b) A rigid lattice structure
c) Ionic bond formation
d) Electron pair sharing
22. What is the hybridization of the central atom in BeCl₂?
a) sp
b) sp²
c) sp³
d) sp³d
23. Which hybridization corresponds to a tetrahedral molecular geometry?
a) sp
b) sp²
c) sp³
d) sp³d
24. What is the bond angle in BF₃?
a) 120°
b) 109.5°
c) 180°
d) 90°
25. The shape of an sp³ hybridized molecule is:
a) Linear
b) Trigonal planar
c) Tetrahedral
d) Octahedral
26. Which hybridization is found in C₂H₄ (ethylene)?
a) sp
b) sp²
c) sp³
d) sp³d
27. sp³d hybridization leads to which molecular shape?
a) Tetrahedral
b) Trigonal bipyramidal
c) Octahedral
d) Bent
28. The bond angle in H₂O is less than NH₃ because:
a) Oxygen has a higher atomic mass
b) Oxygen is more electronegative
c) Water has two lone pairs
d) Water has ionic bonds
29. Which of the following molecules exhibits sp³d² hybridization?
a) CH₄
b) SF₆
c) BF₃
d) BeCl₂
30. What is the molecular geometry of a molecule with sp² hybridization?
a) Linear
b) Trigonal planar
c) Tetrahedral
d) Bent
