Physical Chemistry Answers

Amongst the following statements, which type of bonding does not implies the formation of new substances?

A. Ionic B. Covalent C. Metallic D. None of the above

Which of the following is not a property of sunstances with ionic bonding?

A. High melting point

B. Crystallinity

C. Conduct electricity when molten

D. Conduct electricity in the solid state

Which of the following statements explains why silicon dioxide has a high melting point?

A. It has a giant ionic structure with strong electrostatic attraction between ions.

B. It has a giant covalent structure with strong covalent bonds between atoms.

C. It has a simple molecular structure with weak forces between molecules.

D. It has a giant metallic structure with a strong attraction between positive ions and the sea of electrons

The electron-dot structure (Lewis structure) for which of the following molecules would have two unshared pairs of electrons on the central atom?

A. H₂S

B. NH₃

C. HCN

D. CH₄

E. CO₂

CCl₄, CO₂, PCl_3, PCl₅, SF₆, . Which of the following does not describe any of the molecules above?

A. Linear

B. Octahedral

C. Tetrahedral

D. Trigonal Planar

The structural isomers C₂H₅OH and CH₃OCH₃ would be expected to have the same values for which of the following? (Assume ideal behavior)

A. Gaseous densities at the same temperature and pressure

B. Vapour pressures at the same temperature

C. Boiling points

D. None of the above

THe liquefied hydrogen halides have the normal boiling points. The relatively high boiling point of HF can be correctly explained by which of the following?

A. HF gas is more ideal

B. HF molecules have smaller dipole moment

C. HF is the strongest acid

D. HF molecules tend to form hydrogen bonds

In which compound are there Pi-bonds?

A. C₃H₈

B. C₃H₄

C. C₂H₄

D.KCl

₉₄²⁴¹Pu successively emits, β, α, α, β, α, α, particles. At that point, the nuclide becomes:?

A. ₉₄²²⁵Ra

B. ₈₈²²⁵Ra

C. ₈₄²⁰⁷Ra

D. ₈₄²¹⁹Pu