A. Which response includestwo properties that are typical characteristics of ion

Question

A.       Which response includestwo properties that are typical characteristics of ioniccompounds?

1.       Are solids at roomtemperature

2.       Have high meltingpoints

3.       Solids conductelectricity but liquids do not

4.       Atoms share electrons

a.       1,4

b.      1,2

c.       2,3

d.      2,4

B.  a. When CaCL2 dissolves in water, what typeof intermolecular force exists between the water and the CaCL2?

c. using the concept of electongativity , explain why HCl ispolar and H2 and Cl2 are both non polar.

Explanation / Answer

Explanation: Ionic compounds are solid at room temperature, with highmelting point and boiling point. They also have good electricalconductivity when being in the molten state. The essence of ionicbond in ionic compound is electrostatic force, which doesn'tinvolve the electron sharing between the cation and anion.
B) When an ionic material,like CaCl2, dissolves in water, both ionic bonds and hydrogen bonds arebroken and ion-dipole interaction (force) areachieved. An ion-dipole force is anattractive force that results from the electrostatic attractionbetween an ion and a neutral molecule that has a dipole such asH2O.
C)A binary molecule with two elements possessing differentelectronegativity will leads to the formation of a polar chemicalbond. H and Cl 's electronegativities are different, thus HCl bondis polar bond. For the homonuclear diatomic molecules, There are noelectronegativity between two same elements, correspondinglywithout polarity between the two same elements such as H-H, andCl-Cl.

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