CHAPTER 10 Flashcards
The melting points of water and sodium chloride are respectively 373 K and 1074 K. The melting points for these two compounds are so different because:
none of these
The particles in water are held together by weaker covalent forces, whereas the particles in sodium chloride are held together by stronger covalent bonds.
The particles in water are held together by weaker covalent forces, whereas the particles in sodium chloride are held together by stronger ionic bonds.
The particles in water are held together by weaker intermolecular forces, whereas the particles in sodium chloride are held together by stronger ionic bonds.
The particles in water are held together by weaker intermolecular forces, whereas the particles in sodium chloride are held together by stronger ionic bonds.
Which one of the following groups would best allow the study of London dispersion forces?
Noble Gases and molecules containing dipoles
Elemental Halogens and molecules containing dipoles
Noble Gases and elemental Halogens
none of these
Noble Gases and elemental Halogens
London dispersion forces may also be described as:
permanent dipole-permanent dipole
permanent dipole-induced dipole
temporary dipole-induced dipole
temporary dipole-permanent dipole
temporary dipole-induced dipole
“Dispersion” in the term London Dispersion Force, refers to:
weak forces which often lead to atoms dispersing.
gases and the way they disperse.
random electron distribution.
liquids and the way they disperse.
random electron distribution.
For the following species, the average particle radius is given in brackets in pm: He (140), H2 (150), Cl2 (175). From this data, we can predict that the respective boiling points of these species would be:
none of these
He > H2 > Cl2
He < H2 < Cl2
Cl2 > He > H2 > Cl2
He < H2 < Cl2
For Group 14 (the carbon family) , we would expect that as you go down the Periodic Table, the boiling points of the hydrides of this group would:
decrease.
none of these.
stay the same.
increase.
increase.
In the HCl molecule, the electron cloud would be permanently dispersed:
more towards the H than the Cl.
none of these
more towards the Cl than the H.
evenly over the whole molecule.
more towards the Cl than the H.
For HCl molecules, the intermolecular force is:
weak, due to a temporary dipole-induced dipole.
weak, due to a permanent dipole-permanent dipole.
strong, due to a covalent bond.
strong, due to a permanent dipole-permanent dipole.
weak, due to a permanent dipole-permanent dipole.
Which one of the following does NOT form hydrogen bonds?
H2O
NH3
HCl
HF
HCl
