Chapter 11 Group Problems 1. Identify the most important type of interparticle f

Question

Chapter 11 Group Problems 1. Identify the most important type of interparticle force present in the solids of each of the following substances. a. BaSO4 b. H2S e. Cs ?.?? d. C2He f. Hg g. P e. H2O 2. Predict which substance in cach of the following pairs would have the greater interparticle forces. a. CO2 or oCS c. SF2 or SF e. CH,CHCH NH2 or H:NCH CH2NH2 f B(OH); or BH, g. CH,OH or H CO b. PF or PFs d. SO3 or SO h. HF or HI 3. In each of the following groups of substances, pick the one that has the given property. Justify your answers. a. The lowest boiling point: CH CH or CH,CH CH CH b. Highest freezing point: H2O, NaCl, or CH c. Highest vapor pressure at 25°C; Hg, Ti, H20, or gasoline d. Lowest melting point: N2, CO, KCl, or CO2 e. Strongest hydrogen bonds: H2O, (CH3)2NH, or HF f. Smallest heat of vaporization: CH, CH CHs,or CH CH CH g. Largest enthalpy of fusion: H2O, CO2, MgO, or Li O o: h. Lowest vapor pressure at 25'C: CHCH CH, C C, CHCHCH OH

Explanation / Answer

1 . ans

(a) In BaSO4 , Ba2+ and SO42- ions are held together by strong ionic bond, therefore intermolecular forces present in BaSO4 are ionic bonding .

(b) H2S is a polar molecule and intermolecular forces present in this polar mloecule are Dipole-Dipole forces .

(c) Xe is a noble gas and therefore intermolecular forces present in xenon are weak van der waals forces also known as dispersion or London forcers .

(d) C2H6 i.e Ethane is a non polar molecule and therefore contains weak van der waals intermolecular forces .

(e) Cs is a very soft metal , therefore Cs contains weak metallic bonding .

(f) Hg is a metal which is liqiud at room temperature contains very weak metallic bonding .

(g) P4 i.e phosphorus is a non polar covalent molecule , which contains Dispersion forces .

(h) H2O is a polar covalent molecule in which central oxygen atom is more electronegative , therefore water forms strong intermolecular Hydrogen bonding .

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