Question

For the pair of compound Fe(s) or CCl4(s) the one with the higher melting point is For the pair of compound F e ( s ) or C C l 4 ( s ) the one with the higher melting point is blank.. For the pair of compound KCl(s) or HCl(s) the one with the higher melting point is For the pair of compound K C l ( s ) or H C l ( s ) the one with the higher melting point is blank.. For the pair of compound H2O(s) or H2S(s) the one with the higher melting point is For the pair of compound H 2 O ( s ) or H 2 S ( s ) the one with the higher melting point is blank.. For the pair of compound Ti(s) or Ne(s) the one with the higher melting point is___________.

Answer 1

The melting points of NaCl and MgCl₂ are higher than SC1₂ and Cl₂ because NaCl and MgCl₂ are ionic compounds with strong permanent electrostatic interactions, while SC1₂ and Cl₂ are molecular compounds with weaker interactions.

Step-by-step explanation:

As with all bulk properties, the melting points are a measure of the magnitude of the intermolecular forces at play in the specific system (geometric structures also affect bulk properties like the nature of the crystal lattice, but that is a secondary issue). From inspection, it is clear that the NaCl and MgCl₂ are ionic held together the strongest permanent electrostatic interaction (charge-charge or monopole-monopole); these are ionic solids. For SC1₂ and Cl₂, the solid is a molecular solid with constituent molecules that lack charge and even dipole (easy to tell for Cl₂ and requires a little VSEPR effort for SC1₂. Hence, the next higher permanent electrostatic interactions are active in these molecules (i.e. quadrupole-quadrupole) along with dispersion and repulsive interactions; all of which are much weaker than the charge-charge interactions in NaCl and MgCl₂. The weaker the interactions, the lower the boiling point since less thermal energy is needed to break those interactions.

Answer 2

Fe has a higher melting point than CCl4.

KCl has a higher melting point than HCl

H20 has a higher melting point than H2S

Ti has a higher melting point than Ne

Step-by-step explanation:

The bonding in molecules or compounds will determine its boiling or melting point. The stronger the bonds between the compound and molecules, the higher the energy needed to break the bonds which leads to an higher boiling or melting point.

1. Fe (Iron) has an higher melting point than CCl4 (Tetrachloromethane). The bonding in Fe is metallic while CCl4 has van der waal force. Metallic bonding is stronger than van der waal force. Much energy is needed to break metallic bonding compared to van der waal force
2. KCl (potassium chloride)has ionic bonding while HCl (hydrochloric acid) has permanent dipole (covalent bonding). Ionic bonding is stronger than any covalent bonds. Therefore KCl will have a higher melting point than HCl
3. H20 (water) has hydrogen bonding while H2S (hydrogen sulpide) has permanent dipole. Hydrogen bonding is stronger than permanent dipole.
4. Ti (Titanium) has a metal having metallic bonding while Ne (neon) has van der waal forces. metallic bonding is stronger than van der waal forces.