Unit 2 Week 7

What type of intermolecular force is present in all molecular substances?

• Hydrogen bonding

• Ionic bonding

• Dispersion forces

• Covalent bonding

Which molecule can form hydrogen bonds?

• CH₄

• HCl

• NH₃

• CO₂

Which of the following molecules would have the highest boiling point?

• CH₄

• CH₃Cl

• CH₃CH₂OH

• C₂H₆

What causes a molecule to be non-polar?

• Symmetry and no lone pairs

• Polar bonds and symmetrical shape

• Lone pairs and bent shape

• High boiling point

What is the mobile phase in paper chromatography?

• Paper

• Solvent

• Sample

• Pigment

Why do different substances travel different distances in chromatography?

• They have different masses

• They have different boiling points

• They interact differently with the mobile and stationary phases

• They are different colours

Describe the difference between dispersion forces, dipole-dipole attractions, and hydrogen bonding.

Explain why water has a higher boiling point than hydrogen sulfide (H₂S).

Define the terms stationary phase and mobile phase in chromatography.

In a chromatography experiment, a dye moves 2.5 cm while the solvent moves 5.0 cm. Calculate the Rf value.

Mathematical Equivalence

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