Questions tagged [covalent-compounds]

For questions about covalent compounds - which are compounds in which all intermolecular bonds between atoms are considered mostly covalent - have a stronger covalent than ionic or metallic component. This tag is not to be confused with [bond].

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Why doesn't phosphorus form as many oxides as nitrogen?

Nitrogen has oxides like $\ce{N2O}$, $\ce{NO}$, $\ce{NO2}$, $\ce{N2O3}$, $\ce{N2O5}$, but as far as I know, phosphorus has probably only $\ce{P2O3}$ and $\ce{P2O5}$. Why does nitrogen have so many ...
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Why is FeCl3 covalent? [duplicate]

There is an electronegativity difference of 1.2 between $\ce{Fe}$ and $\ce{Cl}$. Then why it is covalent?
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492 views

Covalency in bonding across the periodic table

Bonding between main group elements is obviously almost entirely covalent and it is often easy to see these covalent bonds as 2c-2e bonds localised between two atoms. The bonding in borane, boron ...
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113 views

Hydrogen covalent bond

It's stated: when two hydrogen atoms form a covalent bond, the distance between them corresponds to the lowest energy. The letters A, B and C show the correspondence between shifts in electron density ...
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3answers
17k views

Why is the chemical formula for vinegar CH3COOH what it is? [duplicate]

I am quite new to chemistry, but I would like to think that I have mastered the basics. This would include naming and writing out chemical formulas. However, once I had seen the formula for vinegar ($\...
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The intuition behind carbon's covalent bonds

As an introduction to hybridization, my textbook discusses that "The formation of covalent bonds often starts with the excitation of the atoms." Taking carbon as an example, the author says: Carbon ...
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0answers
362 views

Workfunction and Bond Energy

Workfunction is the minimum energy required to remove an electron from the surface of the material. If the striking photons does not have the required energy then it won't be able to eject the ...
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1answer
14k views

Why do non-polar covalent compounds dissolve in non-polar covalent compounds only?

My textbook says that electrovalent and polar covalent compounds dissolve in electrovalent compounds and polar covalent compounds but not in non-polar covalent compounds. I understand the reason for ...
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1answer
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Can solutions of polar covalent compounds conduct electricity?

I learned in class that solutions of polar covalent compounds are weakly conductive, while ionic solutions are strongly conductive. But I'm getting different answers online. According to this lecture,...
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Relative O-O bond lengths in O2X2 molecules (X = H, F, Cl)

I am facing problem in the following question: What is the order of bond length of $\ce{O-O}$ in the following compounds: $\ce{H2O2, O2F2, O2Cl2}$ In my view since fluorine is more ...
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How can sulfate be nonpolar covalent if it is a polyatomic ion? [closed]

$\ce{SO4^2-}$ is a polyatomic ion as well as a nonpolar covalent compound. How can it be ionic and covalent at the same time? Same applies to sulfite $\ce{SO3^2-}$. It's a polyatomic ion as well as a ...
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Does fluorine in FNO3 have +1 oxidation number?

According to my textbook and also Wikipedia, fluorine nitrate is a compound which can be created (though it is unstable). Also my textbook says that fluorine has a $+1$ oxidation state. But how is $+1$...
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1answer
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In a combustion reaction, why is carbon in methane oxidised even though it starts and finishes with 8 electrons?

In $\ce{CH4}$, carbon has 8 electrons due to 4 covalent bonds. In $\ce{CO2}$, carbon has 8 electrons due to 2 double bonds. In both cases, carbon has 8 electrons. So why is carbon oxidised? Doesn't ...
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When do I say "Three single covalent bonds" and "Triple bond"

I've a doubt I can't seem to get cleared. Carbon has 4 electrons in its last energy level right? But what do I call the bonds that it makes? The same thing goes with my main question... when do I say ...
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1answer
748 views

Explain why the noble gas Kr does follow the general trend for covalent radii

Looking at covalent radii I know the trend states that as you move from LEFT to RIGHT the radii decreases due to increased nuclear charge. Up until you hit the noble gasses like neon. Neon does not ...
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Will supercritical nitrogen stay supercritical if we raise temperature and pressure high above critical values?

Nitrogen's critical temperature is -146.96 °C and critical pressure 33.96 bar. If we maintain nitrogen at 220 bar and 400 °C, what will be the state of $\ce{N2}$? Will it be still supercritical? I ...
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In practice, do polar molecules actually align in an electric field?

We have all seen the following diagram (or similar) in our first chemistry class, depicting polar molecules aligned in an electric field. Is this just one of the half-truths of beginner chemistry or ...
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How can FeS2 be the formula of iron sulphide and CaC2 be the formula of calcium carbide?

I know that the valency of iron can either be 2 or 3 and so the formulae of the possible sulphides of iron should be $\ce{FeS}$ and $\ce{Fe2S3}$. But I have recently seen the formula $\ce{FeS2}$ used ...
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2answers
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Why do higher fluorine oxyanions not exist? [duplicate]

I asked this question from my teacher and he said that's because fluorine has a high electronegativity and does not form dative bond with oxygen. That's why only hypofluorite $\ce{FO-}$ exists and not ...
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1answer
208 views

Do both electrons in a dative bond come from the same atom?

The textbook definition of a dative bond is that it is a bond "in which the two electrons derive from the same atom" (credits). However, I found that the two electrons of a dative bond may come from ...
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1answer
611 views

Pi bond need sigma bond to exist [duplicate]

My teacher was teaching about chemical bonding and she said that pi bond needs sigma bond to exist, but she didn't know why. It is a doubt which I get in my mind, can someone explain it?
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Why are covalent bonds formed? [duplicate]

As far as I know, -covalent bonds are formed because atoms are unstable -unfilled valence electrons -want to fill up their outer rings and become stable BUT, why does compounds like ClF3 exist? Why ...
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279 views

Melting of Covalent Networks

When you melt a covalent network, you break intramolecular covalent bonds, is that not a chemical change? Also, is ionisation a chemical or physical change?
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Which has the largest bond angle between water, oxygen difluoride and dichlorine oxide?

Which one out of $\ce{H2O}, \ce{Cl2O}, \&\ \ce{F2O}$ will have largest bond angle? I think it should be $\ce{H2O}$ because oxygen is most electronegative in this case so electrons will be more ...
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Why don't covalent compounds have ions? [closed]

When a covalent bond is formed, elements gain shared electrons. Wouldn't this mean covalent compounds contain ions? According to BBC and other sources they don't have any ions at all... How is this so?...
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What's the structure of "inorganic benzene"? [closed]

Can anyone give me a possible structure for a compound called "inorganic benzene"?
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Is beryllium difluoride covalent or ionic?

My textbook says that despite the large electronegativity difference $\ce{BeF2}$ is covalent since the beryllium ion will have too much charge density and it will attract the fluorine electron cloud ...
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1answer
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Why does magnesium form covalent bonds with carbon?

According to my professor, magnesium and lithium form covalent bonds with carbon but calcium does not. He did not elaborate. Why is this so? The electronegativities are: Mg — 1.31 Li — 0.98 Ca — 1 ...
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Structure of N2O2

I've drawn a structure of $\ce{N2O2}$ like this: $$\ce{:\overset{\large.\!\!.}{\underset{\large.\!\!.}{O}}-N#N-\overset{\large.\!\!.}{\underset{\large.\!\!.}{O}}:}$$ I don't know if it's possible. ...
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892 views

Rate of O exchange with H2O

We have to find the order of rate of exchange of O with H2O of the following compounds $\ce{CCl3CHO}$ $\ce{CH3CHO}$ $\ce{CH3COCH3}$ $\ce{CF3CHO}$ According to me, higher rates of exchange would be ...
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445 views

Intermolecular forces - Covalent bonding

Im confused. How to relate permanent dipole dipole moment, temporary dipole induced dipole and Van der waals forces of attractrion?
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is it possible for covalent compounds to produce colour during flame test?

I have heard it is the metal ions that are the reason for flame colour during a flame test. so in covalent bond, there are no metal ions does that mean covalent compounds don't produce flame colour. ...
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AlCl3: ionic and covalent?

My textbook states that AlCl3 is both an ionic and a covalent compound .How is it so?
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1answer
3k views

What makes carbon special? [duplicate]

We are home schooling my son, and right now we are covering chemistry- ionic bonds, covalent bonds, etc. We've talked about how carbon is "special" in that it can form very complex molecules (organic ...
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1answer
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Steric hindrance of an unbonded electron pair

This question is half inspired by this question, and half inspired by the structure of molecules like hydrazine and hydrogen peroxide. When I was looking at the aforementioned molecules, I started ...
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Why do XeO and XeF8 not exist?

Since Neil Bartlett's 1962 discovery that xenon was capable of forming chemical compounds, a large number of xenon compounds have been discovered and described. Almost all known xenon compounds ...
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Does increasing electronegativity imply more covalent character?

If there is a larger electronegativity difference between two atoms, shouldn't the compound be more ionic? In an explanation of the diagonal relationship, it states that "on moving across the period, ...
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2answers
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Partial charges in a covalent bond

My professor stated the following statement: In a covalent bond, there is a presence of a partial charge in the atoms that combine to form a compound. For example in $\ce{H2O}$, since $\ce{O}$ is ...
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1answer
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N-O bonds in Nitric acid

The wikipedia article on nitric acid mentions the following structure of $\ce{HNO3}$ in which the two $\ce{N-O}$ bonds (other than that of $\ce{N-OH}$) are of different length i.e., $119.9\,\pu{pm}$ ...
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1answer
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Does SiCl2 exist and its possible structure

It's known that the elements in IVA all have valence +2 and +4. I also know there exists $\ce{GeCl2}$ and $\ce{SnCl2}$. So my question is does $\ce{SiCl2}$, or even $\ce{CCl2}$ exist? If yes, what ...
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370 views

Do allenes form rings?

I was wondering whether allenes can form rings; geometrically speaking, this seems like it would be energetically unfavorable due to their 180 degree linear geometry.
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Covalent and Ionic bonds with Semi-metals

why are some semimetals considered as a metal, and some, a nonmetal when paired with some atoms. Like in BF, it is an ionic bond, but in SiCl, it is a covalent bond. Do their electronegativities ...
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1answer
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Are Tellurium Fluoride or Antimony Fluoride Ionic?

I would like to know if any of the tellurium fluorides or antimony fluorides are ionic. I am aware that the difference in electronegativity is greater than the 1.665 cutoff indicating ionic bonds. ...
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Is sand a mixture or a compound?

I was given an assignment to find out if sand is a mixture or a compound I'm sure it can't be an element. Considering the fact that a mixture contains two or more substances that are not chemically ...
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1answer
271 views

Is trisulfuric acid hypothetical?

In the preparation of sulfuric acid through contact process, Hot sulfur trioxide passes through the heat exchanger and is dissolved in concentrated $\ce{H2SO4}$ in the absorption tower to form oleum: ...
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1answer
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Increasing Covalent character increases Colour intensity

I observed some trends as follows:- $\ce{PbCl2}$ white and $\ce{PbI2}$ yellow $\ce{SnCl2}$ white, $\ce{SnCl4}$ red and $\ce{SnI4}$ black $\ce{AgCl}$ white, $\ce{AgI}$, $\ce{AgBr}$ and $\ce{Ag2CO3}$ ...
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How many hydrogen bonds in these compounds?

We usually get some questions about how many hydrogen bonds these compounds can create, we use it to differentiate between the boiling point of each one of them so it would be great if you could help ...
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What type of bonding is present in lithium tetrahydridoaluminate?

I can tell that the negative ion has one bond which is a co-ordinate/dative covalent bond. However, overall, would you say that lithium tetrahydridoaluminate (lithium aluminium hydride) is ionic? If ...
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How many electrons will be shared?

Suppose we are to make a bond drawing of a covalent bond between two nitrogen atoms. How would we know how many electrons are shared in each (3)? Do we just logically look at it and see how many ...
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2answers
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Would tin (II) sulfide be considered a covalent network solid?

Considering that tin has a Pauling electronegativity of 1.96 and sulphur 2.58, and that a bond is considered to be ionic with a Pauling EN difference of approx. 1.7 at the least, would tin (II) ...