Identifying Ionic vs Covalent

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Eileen Si 1G
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Joined: Fri Aug 30, 2019 12:17 am

Identifying Ionic vs Covalent

Postby Eileen Si 1G » Fri Oct 25, 2019 2:36 pm

How do you identify whether a bond is ionic or covalent (polar or nonpolar)? And is it possible to tell by just looking at a molecular formula?

Selena Yu 1H
Posts: 62
Joined: Fri Aug 09, 2019 12:16 am

Re: Identifying Ionic vs Covalent

Postby Selena Yu 1H » Fri Oct 25, 2019 2:39 pm

You can identify that a bond is ionic because electrons are being transferred from metal to nonmetal atoms, while a bond is covalent because electrons are being shared instead of being transferred.

Tyler Angtuaco 1G
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Joined: Wed Sep 11, 2019 12:16 am

Re: Identifying Ionic vs Covalent

Postby Tyler Angtuaco 1G » Fri Oct 25, 2019 2:44 pm

Ionic compounds are formed from the combination of a metal and a non-metal, in which the metal is written first in the molecular formula. Covalent compounds are those which consists of covalent bonds, which only result between two non-metals. Another tip in distinguishing between them is through their Lewis structures: ionic compounds are written by denoting the cation and anion separately (the metal and non-metals with their respective charges and brackets around the element with the negative charge), while covalent compounds are written with a shared pair of electrons in between.

Justin Quan 4I
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Joined: Sat Sep 14, 2019 12:17 am

Re: Identifying Ionic vs Covalent

Postby Justin Quan 4I » Fri Oct 25, 2019 3:17 pm

To add on, comparing the electronegativity between atoms is the general way to tell if what type of bonds the molecule will form. Typically a greater difference in electronegativity would mean an ionic bond will form. A small difference, for example around 0.5, would result in non-polar covalent bond. Any difference in between would typically form polar covalent bonds.

Julia Mazzucato 4D
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Joined: Fri Aug 30, 2019 12:17 am

Re: Identifying Ionic vs Covalent

Postby Julia Mazzucato 4D » Fri Oct 25, 2019 5:24 pm

We will also be able to look at formal charges within the molecule to determine polarity of a covalent bond.

Katherine Chhen 3I
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Joined: Fri Sep 28, 2018 12:15 am

Re: Identifying Ionic vs Covalent

Postby Katherine Chhen 3I » Fri Oct 25, 2019 5:45 pm

Julia Mazzucato 4D wrote:We will also be able to look at formal charges within the molecule to determine polarity of a covalent bond.

How would we be able to determine the polarity of a covalent bond using formal charges?

Alan Wu
Posts: 61
Joined: Sat Sep 14, 2019 12:16 am

Re: Identifying Ionic vs Covalent

Postby Alan Wu » Fri Oct 25, 2019 5:46 pm

Difference in electronegativity:
0.0 - 0.4: non-polar covalent bond
0.4 - 1.8: polar covalent bond
>1.8: ionic bond

These numbers can vary from source to source, but you get the general idea.

Madeline Phan 1E
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Joined: Sat Aug 17, 2019 12:18 am

Re: Identifying Ionic vs Covalent

Postby Madeline Phan 1E » Sat Oct 26, 2019 10:28 am

Covalent bonds form between non-metal atoms as they are more similar in electronegativity, while ionic bonds form between non-metals and metals as they have extremely different levels of electronegativity.


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