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7
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1answer
260 views

Is BCl₅ possible?

Is $\ce{BCl5}$ possible? I saw it in book. As far as we can see there is no way to get 5 chlorine atoms with boron.
0
votes
1answer
38 views

Determining covalent bond strengths without hybridisation

Assuming pure $\ce{2s}$ and $\ce{2p}$ orbitals of carbon are used in forming $\ce{CH4}$ molecule, which of the following statements is false? (single choice question) Three $\ce{C-H}$ bonds ...
1
vote
1answer
194 views

Why is Aluminium Chloride a Lewis Acid if it's an ionic compound?

In my textbook it says in the reaction $\ce{AlCl3 + Cl- -> AlCl4-}$, Aluminium Chloride ($\ce{AlCl3}$) has six valence electrons and accepts a lone pair from $\ce{Cl-}$, but wouldn't that mean the ...
2
votes
1answer
44 views

How can sulphur and phosphorus expand their octet

There are many compounds, in which the stability of a molecule is not governed by the presence of octet configuration in central atom. In most of the cases the central atom is generally sulphur or ...
1
vote
2answers
86 views

Binary Molecular Compounds of Nonmetals

How does one determine the formula for two non metal elements? Such as Nitrogen and Oxygen. I look at the charges with Nitrogen having -3 and Oxygen having -2. How would I get to zero? How do you ...
4
votes
3answers
145 views

Bonding in the phosphate ion

I'm looking for an explanation of the bonding in the phosphate (PO43−) ion: (Image courtesy of Wikipedia) Phosphorus (15P) - being the fifteenth element - has fifteen electrons, five valence ...
0
votes
1answer
24 views

Why is silicon oxide giant covalent structure?

Why is silicon oxide giant covalent structure? Why it doesn't bond like carbon dioxide? Thank you
5
votes
3answers
311 views

Are metallic/ionic bonds weaker than covalent bonds? I was taught the opposite. Now I'm confused

In mineralogy class, I was taught that metallic and ionic bonds are weaker than covalent bonds and that's why quartz and diamond have such a high hardness value. However, in organic chemistry class, I ...
10
votes
4answers
250 views

Bond Length of CO+ is expected to be more than CO but it is found to be less. Why is this so?

According to Molecular Orbital Theory(MOT), the bond order of CO is 3. When CO+ is formed, bond order decreases to 2.5 and thus bond length should increase. However, the bond length of CO+ is found to ...
7
votes
3answers
720 views

The Crisscross method for finding the chemical formula

I am reading this wikipedia article that I don't understand. What I don't understand is: suppose we have two elements $X$ and $Y$ having oxidation numbers $x$ and $y$ respectively. Can we prove ...
2
votes
1answer
86 views

How would one compare the magnitude of covalent character between SnCl4 and SnF2 using Fajan's Rules?

It is easy to compare two ionic compounds when one of the ions is same. However, how do we compare two compounds if one of the ions is the same element but just has different charge and the other ion ...
1
vote
2answers
81 views

What are pharmaceutical uses for Vanillin?

What are some pharmaceutics that use vanillin? Is vanillin just an aroma and taste agent to pharmaceutics?
5
votes
1answer
150 views

Is pyrite (FeS2) an ionic or a covalent compound?

I have searched all over the web and found a lot of diverse explanations, but none of them are concluding exactly whether $\ce{FeS2}$ (solid - pyrite) is a covalent or an ionic compound. From ...
2
votes
2answers
61 views

Chemical Bonding

A Covalent bond involves overlapping of orbitals while an Ionic bond involves charge separation. Why is overlapping of orbitals less stronger than charge separation,i.e., why is an Ionic bond stronger ...
2
votes
1answer
25 views

Quantum Valence Theory Reference

At least to me, the contents of chapters 5 & 6 given here are representative of discussions on chemical bonding given in nearly all intro general & organic chem books, the statements in those ...
0
votes
0answers
23 views

Is the Hybridization model for bonding based on underlying principles or the observable phenomena? [duplicate]

Consider the $CH_4$ molecule. It is observed that all of the bond lengths are identical, which contradicts the theory about $s$ and $p$ orbitals. Clearly, the theory needs to be modified to take this ...
2
votes
1answer
441 views

Why do ionic compounds dissociate whereas coordinate complex's won't?

An ionic bond is the bonding between a non-metal and a metal, that occurs when charged atoms (ions) attract after one loses one or more of its electrons,and gives it to the other molecule, for ...
7
votes
1answer
182 views

Covalent bond deformation

When do covalent bonds of a molecule $M$ extend or compress while no bonds in $M$ are broken? I can conceive of some possibilities but I don't know how common they are: Temperature changes ...
0
votes
1answer
65 views

Chemical bond-covalent-valence electrons OH-

I would like to ask how many valence electrons took part in creating chemical bond in OH-? Is the minus related to O or to H? Are there any spare valence electrons which didnt take part in creating ...
2
votes
1answer
36 views

Non-stoichometric compounds

I am looking for references (review articles, reports) about non-stoichometric compounds. Any idea of where should I look?
0
votes
1answer
49 views

Hydrogen ozonide existence

Does the hydrogen ozonide exist? I mean if this compound could be found in Nature $$HO_3$$ I am interested in the theoretical or phenomenological of such a chemical compound...
0
votes
1answer
264 views

How can the Bonding in IF7 be explained using LCAO method?

I know that the VSEPR theory explains $IF_7$ (iodine heptafluoride)'s structure as a pentagonal bipyramidal one.The valence bond theory can be used to say that it has $sp^3d^3$ hybridisation(i think ...
0
votes
0answers
60 views

Why are gem-dihalides not named as alkyllidene dihalides?

The dihalo-compounds having the same type of halogen atoms are classified as geminal halides (halogen atoms are present on the same carbon atom) and vicinal halides (halogen atoms are present on the ...
1
vote
1answer
567 views

Sulfur trioxide - vacant d-orbitals

Sulfur trioxide violates the octet rule. Upon drawing the Lewis dot structure for sulfur trioxide, we see that the central sulfur atom is bonded to three other oxygen atoms by double covalent bonds. ...
1
vote
1answer
372 views

Beryllium chloride - Highly hydrolysable?

Beryllium chloride's geometric structure is linear, with a bond angle of 180 degrees. Drawing the Lewis dot structure for this covalent compound, one can see that the compound is electron deficient ...
1
vote
3answers
201 views

Negative charge of methoxide anion

Why is the methoxide ($CH_{3}O^{-}$) anion negatively charged? It has 13 valence electrons and has 13 free electrons. In spite of that the methoxide anion is negatively charged.
1
vote
3answers
5k views

Why is the melting/boiling point of ionic bond higher than covalent bond?

As the title says, why is the melting and boiling point of ionic bond usually higher than covalent bond? I know that compounds with ionic bonds are usually solid at room temperature, so I want other ...
1
vote
1answer
559 views

valence electrons in azide ion

We had a test and and we had a question asking the number of Valence electrons in an azide ion((N3)- ). I find out that the answer is 16 but I could not understand how. I saw the structure. It ...
2
votes
1answer
505 views

Is there a word for a compound that has both ionic and covalent bonds?

For example, calcium carbide (CaC$_2$) has covalent C‒C bonds and ionic Ca$^{2+}$‒ C$_2^{2-}$ bonds.
5
votes
1answer
774 views

Electron density definition of single, double, triple bonds?

I was reading this question and the answer by @EricBrown to it and this got me thinking about covalent chemical bonds. The way I was always taught is that a single bond contains 2 paired electrons, ...
5
votes
2answers
141 views

Is it Possible, Chemically, to change a Dextrorotatory Compound to its Levorotatory Counterpart?

Is it possible, chemically, to change a dextrorotatory compound to its levorotatory counterpart? e.g. Is it possible to change levodopa to dextrodopa?
-5
votes
1answer
2k views

How many covalent bonds are present in Propane [closed]

Can anybody tell me that how many covalent are present in the Propane which have 3 Carbon atoms and 8 Hydrogen atoms $(C_3H_8)$
3
votes
1answer
120 views

Shape of C₂H₂ molecule

What is the shape of the $C_2H_2$ molecule? The fact that is has a triple covalent bond between the 2 carbon atoms and 2 other bonding pairs between the hydrogen and carbon atoms leads me to believe ...
3
votes
1answer
349 views

How to determine stable electron states in ionic and covalent bonds?

I'm working on a program that needs to determine if a bond between two or more elements will result in a stable state. I understand at a high-level how to fill electron subshells using the Aufbau ...
24
votes
2answers
2k views

Bonding in C2, a carbon-carbon quadruple bond?

Carbon is well known to form single, double, and triple C-C bonds in compounds. There is a recent report (2012) that carbon forms a quadruple bond in diatomic carbon, $\ce{C2}$. The excerpt below is ...
7
votes
2answers
2k views

Why do Magnesium and Lithium form *covalent* organometallic compounds?

Lithium and magnesium are Group 1 and Group 2 elements respectively. Elements of these groups are highly ionic, and I've never heard of them forming significantly covalent inorganic compounds. Yet ...