Chemistry, 03.01.2020 11:31 javink18

What is the type of bond with δen=1.7? ionic or polar covalent?

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Polar. from inter net
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No , it is not necessary that if the E.N difference is greater than 1.7 then the bond should be ionic.For ionic and covalent bonds we see that the bond is between what kind of atoms, they are either metals or non-metals.If the bond is between metal and non-metal then it should be ionic like in NaCl.Na is metal while Cl is non-metal.Na has greater atomic radius can lose electron easily and having low ionization energy while Cl has smaller atomic radius can gain electron easily and having high ionization energy . Therefore they form ionic bond.On the other hand non-metals havimg small atomic radii having high values of I.E therefore non of them can lose electrons due to high ionization energy values.Instead of losing and gaining of electrons they share their valance electrons in order to get stability.Since in HF both H and F are non-metals therefore they form covalent bond.From the above discussion we conclude that whether a chemical bond is between metal and non-metal then it will be ionic and if there is a chemical bond between non-metals it will be covalent.”

Answer from: Quest

668900 atoms in total

Answer from: Quest

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.

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