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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?
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?
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