Van der Waals’ forces

Last updated: 20/02/2020

WJEC A-Level Chemistry Unit 1.4 – Bonding Van der Waals’ forces

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Question 1 of 20

1. Question
What is the definition of an intermolecular force?
- Forces between molecules
- Forces between ions
- Forces between atoms
- Forces between delocalised electrons and positive atoms
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Question 2 of 20

2. Question
Why do intermolecular forces form?
- Random electron movements within shells of atoms in molecules
- Collisions of molecules
- Collisions of atoms
- Random ion movements of atoms in molecules
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Question 3 of 20

3. Question
What is the definition of a permanent dipole?
- A molecule has a slightly positive and slightly negative end.
- A molecule is positively charged
- A molecule is negatively charged
- A molecule has an unbalanced distribution of protons
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Question 4 of 20

4. Question
What is the definition of permanent dipole-induced dipole interactions?
- Molecules with permanent dipoles will induce a dipole in molecules with no permanent dipoles
- Molecules with permanent dipoles will be attracted to other molecules with permanent dipoles
- Molecules with no permanent dipoles will induce dipoles in molecules with no permanent dipoles
- Forces formed from the constant random movement of electrons in atom shells, unbalancing the distribution of electrons and causing an instantaneous dipole in the molecule
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Question 5 of 20

5. Question
What is the definition of permanent dipole-permanent dipole interactions?
- Molecules with permanent dipoles will be attracted to other molecules with permanent dipoles
- Molecules with permanent dipoles will induce a dipole in molecules with no permanent dipoles
- Molecules with no permanent dipoles will induce dipoles in molecules with no permanent dipoles
- Forces formed from the constant random movement of electrons in atom shells, unbalancing the distribution of electrons and causing an instantaneous dipole in the molecule
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Question 6 of 20

6. Question
What is the definition of London forces?
- Forces formed from the constant random movement of electrons in atom shells, unbalancing the distribution of electrons and causing an instantaneous dipole in the molecule
- Molecules with permanent dipoles will induce a dipole in molecules with no permanent dipoles
- Molecules with no permanent dipoles will induce dipoles in molecules with no permanent dipoles
- Molecules with permanent dipoles will be attracted to other molecules with permanent dipoles
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Question 7 of 20

7. Question
What is another name for London forces?
- Dispersion forces
- Hydrogen bonding
- Permanent dipole-induced dipole interactions
- Permanent dipole-permanent dipole interactions
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Question 8 of 20

8. Question
What is another name for London forces?
- Van der Waals forces
- Permanent dipole-permanent dipole interactions
- Induced dipole-induced dipole interactions
- Permanent dipole-induced dipole interactions
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Question 9 of 20

9. Question
Which of the following are a type of intermolecular bond?
- Hydrogen bonding
- Covalent bonding
- Ionic bonding
- Fluorine bonding
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Question 10 of 20

10. Question
Which of the following are a type of intermolecular bond?
- Van der Waals forces
- Carbon bonding
- Covalent bonding
- Ionic bonding
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Question 11 of 20

11. Question
Which of the following are a type of Van der Waals force?
- London forces
- Hydrogen bonds
- Ionic bonding
- Covalent bonding
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Question 12 of 20

12. Question
An intermolecular force can be from by molecules with permanent dipoles being attracted to other molecules with permanent dipoles. Which of the following intermolecular forces is being described?
- Permanent dipole-permanent dipole interactions
- Permanent dipole-induced dipole interactions
- London forces
- Hydrogen bonding
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Question 13 of 20

13. Question
An intermolecular force can be form by molecules with permanent dipoles inducing a dipole in molecules with no permanent dipoles. Which of the following intermolecular forces is being described?
- Permanent dipole-induced dipole interactions
- Permanent dipole-permanent dipole interactions
- London forces
- Hydrogen bonding
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Question 14 of 20

14. Question
What happens to intermolecular forces when a substance is heated?
- Energy is being used to overcome the intermolecular forces
- They separate
- Particles in between them collide
- Energy is being used to strengthen the intermolecular forces
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Question 15 of 20

15. Question
What happens to the boiling point as you go down a group?
- Boiling point increases
- Boiling point decreases
- Boiling point increases, then decreases
- Boiling point stays the same
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Question 16 of 20

16. Question
Describe why the boiling point increases as you go down the noble gas group.
- The number of London forces increases, increasing the amount of energy needed to break the intermolecular forces
- The number of the dipole-dipole interactions increases, increasing the amount of energy needed to break the intermolecular forces
- The number of London forces decreases, decreasing the amount of energy needed to break the intermolecular forces
- The number of the dipole-dipole interactions decreases, decreasing the amount of energy needed to break the intermolecular forces
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Question 17 of 20

17. Question
As the number of electrons increases in atoms down a group, what happens to the strength of Van der Waals forces?
- Strength increases
- Strength decreases
- Strength stays the same
- Strength increases and the decreases rapidly
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Question 18 of 20

18. Question
Which of the following is the strongest type of intermolecular force?
- Ionic bonds
- London forces
- Hydrogen bonds
- Permanent dipole-dipole forces
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Question 19 of 20

19. Question
Which of the following is the weakest type of intermolecular force?
- London forces
- Hydrogen bonds
- Ionic bonds
- Permanent dipole-dipole forces
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Question 20 of 20

20. Question
Which of the following is not a type of intermolecular force?
- Covalent bonds
- Hydrogen bonds
- London forces
- Permanent dipole interactions
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