Question
Asked Nov 9, 2019
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3. Which of the following compounds would you predict to be ionic and which would be
covalent? (Hint: calculate the electronegativity difference between two bonded atoms)
(d) BaCl2
(e) CO2
(a) MgO
(b) HCI
(c) PCI3
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3. Which of the following compounds would you predict to be ionic and which would be covalent? (Hint: calculate the electronegativity difference between two bonded atoms) (d) BaCl2 (e) CO2 (a) MgO (b) HCI (c) PCI3 htolloWina' 4.0raw

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Expert Answer

Step 1

Whether a compound is ionic or covalent, depends on the electronegativity difference between the two bonded atoms. If electronegativity difference is less than 1.7, the compound will be covalent. If electronegativity difference (Δχ) is greater than 1.7, the compound will be ionic.

Step 2

Part (a)

 

The given compound is MgO.

The electronegativity value of Mg and O is 1.31 and 3.44 respectively. The electronegativity difference (Δχ) between Mg and O is calculated as shown below.

AZ=electronegativity of O-electronegativity of Mg
=3.44-1.31
= 2.13
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AZ=electronegativity of O-electronegativity of Mg =3.44-1.31 = 2.13

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Step 3

The electronegativity difference (Δχ) is 2.13, which is greater than 1.7. Therefore, MgO is ionic compound.

 

Part (b)

 

The given compound is HCl.

The electronegativity value of H and Cl is 2.20 and 3.16 respectively. The ...

AZ electronegativity of Cl -electronegativity of H
=3.16-2.20
=0.96
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AZ electronegativity of Cl -electronegativity of H =3.16-2.20 =0.96

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