Polar Covalent Compounds

Polar Covalent Compounds

By NAUDIA LAWRENCE

Video Questions

1. What is a polar covalent bond?

2. How are polar covalent bonds formed​.

3. How is polarity measured?​

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Polarity (-ve or +ve poles) depend on the electronegativity values on Table S

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Electronegativity indicates how strongly an atom of an element attracts electrons in a chemical bond.

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Electronegativity values are assigned on Table S

Oxygen is very electronegative so it pulls electrons to itself

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​Water is a Polar Molecule

The general Rule for polarity is

• Metals -low electronegativity numbers

• Non-metals - high electronegaticity value​

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Multiple Choice

Which term represents the attraction one atom has for the electrons in a bond with another atom?

• (1) electronegativity

• (2) electrical conductivity

• (3) first ionization energy

• (4) mechanical energy

Multiple Choice

In a bond between an atom of carbon and an atom of fluorine, the fluorine atom has a

• (1) weaker attraction for electrons

• (2) stronger attraction for electrons

• (3) smaller number of first-shell electrons

• (4) larger number of first-shell electrons

Multiple Choice

Which element has an atom with the greatest tendency to attract electrons in a chemical bond?

• (1) carbon

• (2) chlorine

• (3) silicon

• (4) sulfur

Multiple Choice

An atom of which element has the greatest attraction for electrons in a chemical bond?

• (1) As

• (2) Ga

• (3) Ge

• (4) Se

Multiple Choice

Which atom has the weakest attraction for the electrons in a bond with an H atom?

• (1) Cl atom

• (2) F atom

• (3) O atom

• (4) S atom

Multiple Choice

Which element has the lowest electronegativity value?

• (1) F

• (2) Fr

• (3) Cl

• (4) Cr

Multiple Choice

What is the most likely electronegativity value for a metallic element?

• (1) 1.3

• (2) 2.7

• (3) 3.4

• (4) 4.0