In each of the following groups of pick the one that has the given property. Jus

Question

In each of the following groups of pick the one that has the given property. Justify substances, your answers. a. Highest boiling point: Hg, NaCl, or N_2 b. Smallest surface tension: H_2O, CH_3CN, or CH_3OH c. Lowest freezing point: H_2, CH_4, or CO d. Smallest vapor pressure at 25' C: SiO_2, CO_2, or H_2O e. Greatest viscosity: CH_3CH_2CH_2CH_3, CH_3CH_2OH, or HOCH_2CH_2OH f Strongest hydrogen bonding: NH_3, PH_3, or SbH_3 g. Greatest heat of vaporization: HF, HCl, HBr, or HI h. Smallest enthalpy of fusion: H_2O, CO_2. MgO, or Li_2O

Explanation / Answer

(a) NaCl. It is an ionic compound which has strong electrostatic attraction among its ions.

(b) CH3CN: because it has weak attraction attractions among its molecules.It cannot pull the surface molecules inner side much.

(c) H2. It is a non polar molecules having only lodon forces of attractions so, it needs lowest temperature to get solidify.

(d) SiO2: It is three dimensional covalent network solid having strong covalent bonds among its molecules so less chamce to get vapourise.

(e) HOCH2CH2OH: Because it has stronger attractions among its molecules (H-bonding)

(f) NH3: Because the difference between electronegativities of N and H is more.

(g) HF: Because of strong intermolecular hydrogen bonding among HF molecules.

(h) CO2: Because there exiss only weak dipole dipole attractions which can easily be broken.

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