26 votes
Accepted

If I drink water without sipping, is there a chance of saliva diffusing into my bottle?

This question reminds me of a germaphobic classmate I had back in Middle-school. He would always stay clear of public lavatories/urinals because he was under the impression that urinating at one would ...
paracetamol's user avatar
  • 18.7k
22 votes

The impossibility of 100% ionic bond

A "100% ionic" bond would be a bond whose bonding electron(s) were never in the vicinity of the cation, but rather always in unperturbed valence orbitals of the anion. That's not far from the truth ...
zwol's user avatar
  • 1,170
20 votes
Accepted

Are salts (e.g. NaCl) soluble in liquid metals?

Yes, to varying extent. So just as a starter for your bibliographic research: The solubility of salts in metals, a technical report by the US Department of Energy turned in by December 31st, 1960: &...
Buttonwood's user avatar
19 votes
Accepted

How can FeS2 be the formula of iron sulphide and CaC2 be the formula of calcium carbide?

What you call iron sulphide, in my opinion, is more appropriately referred to as or iron disulphide. If one were to assign oxidation states to each atom, an appropriate description would be $\ce{Fe^...
getafix's user avatar
  • 8,485
16 votes

Why does KCl come in amber coloured bottles?

The potassium chloride solutions in my lab are in transparent glass bottles, as was the potassium chloride solution in my inorganic students’ lab at the LMU in Munich. If I recall it correctly, the ...
Jan's user avatar
  • 67.7k
16 votes

What is the analogue of "molecule" for ionic compounds?

The term you are looking for is formula unit, I think. Wikipedia doesn't really describe it super well, but just to give an example, you could write the sentence $\pu{58.44 g}$ of $\ce{NaCl}$ ...
orthocresol's user avatar
  • 70.9k
16 votes
Accepted

Are all ionic compounds salts?

Interestingly, IUPAC states that a "salt" is "a chemical compound consisting of an assembly of cations and anions". Under this definition, all ionic compounds are salts, and all salts are ionic ...
Nicolau Saker Neto's user avatar
15 votes
Accepted

Why does KCl come in amber coloured bottles?

On a sample of one selling site, amber bottles are cheaper than similar clear bottles, for some moderate to large quantities, at least today. KCl is fairly cheap so when selling the stuff in small ...
davidbak's user avatar
  • 266
15 votes

Why exactly does molten NaCl explode, when it is poured into water?

Understand that sodium chloride is not made up of sodium metal and chlorine gas but of sodium ions and chloride ions, held together by ionic interactions. Under these thermal conditions (liquefication)...
Jan's user avatar
  • 67.7k
15 votes
Accepted

Effect of noble gas configuration on polarising power

Recall the fact that the basic difference between an ionic bond and a covalent bond, is basically just charge separation. In ionic bonds, charges are well separated, and the bond arises due to ...
Pritt says Reinstate Monica's user avatar
14 votes

How do you explain the formula Fe3O4 using the ionic compound theory?

Iron forms both $\ce{Fe^2+}$ and $\ce{Fe^3+}$ ions. The first combine with oxygen ions to $\ce{FeO}$; the second $\ce{Fe2O3}$. $\ce{Fe3O4}$ can be thought of as a mixture of both compounds in equal ...
Glorfindel's user avatar
  • 2,075
14 votes
Accepted

Which has higher lattice energy: MgO or LiF?

$\ce {MgO}$ ($\approx 3800$ $\pu{kJ mol^{-1}}$) has higher lattice energy than $\ce {LiF}$ ($\approx 1045$ $\pu{kJ mol^{-1}}$) mainly because of the greater charge on $\ce{Mg^2^{+}}$ ion and $\ce {O^{...
Archer's user avatar
  • 5,433
13 votes

Can a organic compounds such as hydrocarbons contain an ionic bond?

"Ionic bond" does not necessarily mean the same thing as "bond that is not covalent". For example, I would have a difficult time classifying a hydrogen bond as being either ionic or covalent in nature....
orthocresol's user avatar
  • 70.9k
13 votes
Accepted

Why is MnO2 not a peroxide?

Peroxides contain two oxygens connected by a single bond. X-ray or neutron diffraction will show that the oxygens in $\ce{MnO2}$ are too far apart to be bonded, and therefore it is not a peroxide. ...
Ian Bush's user avatar
  • 2,950
13 votes

Why is MnO2 not a peroxide?

The question’s logical premise is skewed. $\ce{CO2}$ is carbon(IV) oxide or carbon dioxide. But carbon(II) also exists and so does carbon(II) oxide (carbon monoxide, $\ce{CO}$). Just because there are ...
Jan's user avatar
  • 67.7k
13 votes

Covalent and Ionic Bonds

Bonds are usually used to describe how electrons are shared. "Partially ionic bonds" are polar covalent bonds. Which is not the same as saying that a compound has different types of bonds in the whole ...
CoffeeIsLife's user avatar
  • 4,284
13 votes

The impossibility of 100% ionic bond

Actually bonds that are $100\%$ ionic, or close to it, are possible. But they require a little ingenuity. Instead of combining atoms of very different electronegativity, we can build multiatomic ...
Oscar Lanzi's user avatar
  • 55.7k
13 votes
Accepted

Which has a greater dominance: hydration enthalpy or lattice energy?

The dominant factor depends on situation to situation.Here is an explanation i found helpful while predicting solubilities The hydration energy is of Form A÷r1 + B÷r2 . The lattice energy is of form ...
Polario's user avatar
  • 450
13 votes
Accepted

Is calcium chloride an acidic or basic salt?

Calcium hydroxide has solubility about 1.9 g/L. This is enough to create pH above 11, i.e. a strongly basic solution. $\ce{CaCl2}$ solutions should be very slightly acidic if they were made from pure ...
permeakra's user avatar
  • 21.5k
13 votes

Are salts (e.g. NaCl) soluble in liquid metals?

The solubility of oxygen, in effect cuprous oxide, in molten copper is important in the smelting and processing of this metal. Silvain et al. 1 give the copper-oxygen phase diagram below: Thus at $\...
Oscar Lanzi's user avatar
  • 55.7k
12 votes

How can FeS2 be the formula of iron sulphide and CaC2 be the formula of calcium carbide?

There is no point in doubting the composition of these compounds, the measurements don't lie. ;-) The point is that S or C (or e.g. P) can not only form bonds to the metal, but also between ...
Karl's user avatar
  • 12k
12 votes

If I drink water without sipping, is there a chance of saliva diffusing into my bottle?

With respect to the exact question in a highly literal sense, it is highly unlikely and next to impossible for ions to diffuse upstream in this manner; the linked question deals with this very nicely. ...
Tasos Papastylianou's user avatar
11 votes
Accepted

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

You seem to have fallen into the trap of thinking that ionic and covalent bonds are fundamentally different. They are not - they are just two ends of a spectrum, which has an arbitrary division ...
bon's user avatar
  • 15.3k
11 votes
Accepted

Why does phosphoric acid mask the colour of iron(III) complex in water?

When phosphoric acid is added to an aqueous solution of iron (III), the ligands in the yellow complexes $\ce{[Fe(OH)(H2O)5]^2+}$ and $\ce{[Fe(OH)2(H2O)4]+}$ ( $\ce{[Fe(H2O)6]^3+}$ are weakly colored ...
Jannis Andreska's user avatar
11 votes
Accepted

Is beryllium difluoride covalent or ionic?

There is a very relevant article by Gillespie Covalent and Ionic Molecules: Why Are BeF2 and AlF3 High Melting Point Solids whereas BF3 and SiF4 Are Gases? J. Chem. Educ., 1998, 75 (7), p 923. ...
DavePhD's user avatar
  • 40.5k
11 votes
Accepted

How is NH4Cl a salt?

This is not the correct definition of salt. The IUPAC definition of salt is "a chemical compound consisting of an assembly of cations and anions". In fact there are many salts which do not fit the ...
Khan's user avatar
  • 1,226
11 votes

An ionic compound dissociates into 3 ions of 3 different elements?

Yup, they are definitely possible. Such salts are called as mixed salts. They furnish more than two ions when dissolved in water. A popular example is Mohr's salt, popularly used as a standard titrant ...
Pritt says Reinstate Monica's user avatar
11 votes

Is tropylium cyclopentadienide possible?

While I can't give a definitive disproof, my intuition is that an unsubstituted cyclopentadienide anion would be far too nucleophilic and react with the tropylium cation at non-cryogenic temperatures (...
Nicolau Saker Neto's user avatar
10 votes
Accepted

Does sodium cyanide react with water, and can it cause an explosion?

Usually, I dislike conspiracy theories.1 However, this one (if it even is one) is true. Looking at the list presented on Wikipedia of the chemicals that were stored in that warehouse, why would you ...
Jan's user avatar
  • 67.7k
10 votes

The impossibility of 100% ionic bond

In a "100 %" covalent bond, like the $\sigma_{ss}$ bond in the dihydrogen molecule, the electron probability density is perfectly symmetrically divided between the two bonded nuclei because both have ...
Gert's user avatar
  • 1,927

Only top scored, non community-wiki answers of a minimum length are eligible