The polymers are classified according to their molecular forces. Concept introduction: The polymers are classified based on the intermolecular forces present in the compound. These are four types. i.e., 1) Elastomers 2) Fibres 3) Thermoplastic polymers 4) Thermosetting polymers Elastomers are the polymers which contain weakest forces of attractions. Fibres are the thread forming polymers which contain very strong intermolecular attractions. Hence these polymers are used to make ropes (nylon (6, 6)) Thermoplastics are the polymers which are linear or slightly branched and having intermediary intermolecular attractions between elastomers and fibres. Thermosetting polymers are cross-linked polymers which has having different characteristics than thermoplastics.

Question

Consider the lattice energies of the following Group 2Acompounds: BeH2, 3205 kJ/mol; MgH2, 2791 kJ/mol;CaH2, 2410 kJ/mol; SrH2, 2250 kJ/mol; BaH2, 2121 kJ/mol.(a) What is the oxidation number of H in these compounds?(b) Assuming that all of these compounds have the samethree-dimensional arrangement of ions in the solid, whichof these compounds has the shortest cation–anion distance?(c) Consider BeH2. Does it require 3205 kJ of energyto break one mole of the solid into its ions, or does breakingup one mole of solid into its ions release 3205 kJ of energy?(d) The lattice energy of ZnH2 is 2870 kJ/mol. Consideringthe trend in lattice enthalpies in the Group 2A compounds,predict which Group 2A element is most similar in ionic radiusto the Zn2+ ion.

Answer 1

Question

Chapter 8, Problem 8.64PAE

Interpretation Introduction

Interpretation:

The polymers are classified according to their molecular forces.

Concept introduction:

The polymers are classified based on the intermolecular forces present in the compound. These are four types. i.e., 1) Elastomers 2) Fibres 3) Thermoplastic polymers 4) Thermosetting polymers

Elastomers are the polymers which contain weakest forces of attractions.

Fibres are the thread forming polymers which contain very strong intermolecular attractions. Hence these polymers are used to make ropes (nylon (6, 6))

Thermoplastics are the polymers which are linear or slightly branched and having intermediary intermolecular attractions between elastomers and fibres.

Thermosetting polymers are cross-linked polymers which has having different characteristics than thermoplastics.

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