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6. Which of these is not made up of carbon only/ is not a carbon allotrope?

  • lonsdaleite
  • Benzene
  • Graphite
  • Diamond

7. Which of these molecules doesn't have H bonds?

  • C2H2OH
  • CH4
  • H2O
  • NH4

8. Which of these is NOT describing the same shape as the others?

  • Eg PCl5
  • Trigonal pyramidal
  • Includes angle of 90
  • Three atoms are on the same plane

9. In order for a substance to dissolve...

  • ...the solute-solute bonds need to be stronger than the solvent-solvent bonds
  • ...polar compounds should be used as the solvent
  • ...the attractions formed between the solute and solvent need to be stronger than the original bonds
  • ... a compound with a different type of bonding must be used

10. Which of these is incorrect?

  • An arrow can be used to indicate a net drift of electrons towards the less electronegative species in a molecule
  • An arrow can be used instead of a bond line to show a dative bond
  • An arrow can be used instead of a bond line to show a polar bond
  • An arrow can be shown in a bond pointing towards an atom with an empty orbital

11. It doesn't conduct when solid, it has a high melting point, it is...

  • a metallic structure
  • an ionic lattice
  • a giant ionic OR giant covalent structure
  • a simple molecular structure

12. What causes ice to be less dense than liquid water?

  • There are no intermolecular interactions between molecules as solids so the molecules drift apart
  • Molecules vibrate more when cold and thus move apart, making the solid less dense
  • Hydrogen bonds between molecules in ice create an open and spaced "cage" structure, which breaks down on melting
  • Molecules pack more efficiently in the water liquid due to strong hydrogen bonds pulling molecules together at 180o of each other

13. Which of these is not a property of ionic compounds?

  • High melting points
  • Often soluble in water
  • Conduct when solid
  • Brittle

14. What is a pi-bond?

  • The stronger bond in a double bond, with electron density trapped between nuclei
  • The end on overlap of two p-orbitals
  • The sideways overlap of two p-orbitals
  • The end on overlap of two s-orbitals

15. What is the most significant reason why HF has a higher boiling point than HCl?

  • Chlorine's larger number of electrons means more shielding of the nucleus therefore more repulsion between atoms in the H-Cl bond
  • HF is more polar so can create stronger permanent dipole-dipole forces
  • HF can form strong hydrogen bonds between molecules, HCl cannot
  • The H-F bond has a higher bond enthalpy than H-Cl

16. Which of these molecules does not have 8 electrons around the central atom?

  • N2
  • PCl5
  • HOCl
  • H2O

17. If a molecule has two bonded and two lone pairs; it's ...

  • v-shaped
  • tetrahedral
  • got a bond angle of 109.5
  • trigonal bipyramidal

18. Which one of the following is not a giant covalent lattice?

  • Diamond
  • Graphene
  • Potassium Iodide
  • Silicon (IV) oxide

19. Which of these phrases is correct?

  • CO2 is a polar molecule
  • A molecule whose dipoles reinforce each other must be symmetrical.
  • A molecule can have polar bonds and not have an overall polarity
  • All molecules with polar bonds have permanent dipoles

20. Which of these interactions is weakest?

  • London Forces/induced dipoles
  • Permanent dipole
  • Hydrogen bonds
  • Covalent bond