General Chemistry Internal Assessment

Which property is not typical of ionic compounds?

• High melting points

• Good electrical conductivity in solid state

• Solubility in water

• Hard and brittle nature

Which of the following represents the energy released when one mole of an ionic crystalline compound is formed from gaseous ions?

• Ionization energy

• Electron affinity

• Lattice energy

• Bond energy

In the Born-Haber cycle, which step represents the lattice energy?

• Formation of gaseous atoms

• Formation of gaseous ions

• Formation of solid ionic compound from gaseous ions

• Dissociation of solid ionic compound into gaseous ions

According to Fajans' rules, which ion combination is likely to form a compound with significant covalent character?

• Small cation with low charge, large anion with low charge

• Large cation with high charge, small anion with high charge

• Small cation with high charge, large anion with high charge

• Large cation with low charge, small anion with low charge

According to VSEPR theory, what is the shape of a molecule with the formula AB3?

• Linear

• Trigonal planar

• Tetrahedral

• Bent

Which shape does a molecule with the formula AB4 typically have according to VSEPR theory?

• Linear

• Trigonal planar

• Tetrahedral

• Bent

In homolytic bond cleavage, the bond breaks in such a way that:

• Both electrons go to one atom

• One electron goes to each atom

• No electrons are transferred

• Electrons are shared equally by both atoms

Which of the following intermediates has a positive charge?

• Carbanion

• Carbocation

• Carbene

• Nitrene

The inductive effect in alkyl halides makes the carbon atom

• More electronegative

• More electrophilic

• More nucleophilic

• More basic

A carbene is best described as having

• A full octet of electrons

• A lone pair and an empty p-orbital

• Two unpaired electrons

• A positive charge