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Answered 2013-01-24 04:22:23

EMPIRICAL formulas

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Formulas of ionic compounds must be expressed as formulas 9 letters?

haha funny how I've been looking for that too, some stupid crossword for chem. the answer is empirical


Why are molecular formulas not practical for ionic compounds?

Molecular formulas are not practical for ionic compounds because they do not have any molecules. A formula like the empirical formula must be used instead since they have ions.


How do you solve ionic compound formulas?

since ionic compounds don't share the atoms must satifly the situation for the compound to work


What can ionic compounds dissolve in?

Almost all the ionic compounds are soluble in water due to polar nature of water. Now coming to your question, if you mean which substances are soluble in ionic compounds, then you must know that ionic compounds are quite good solvent for ionic or polar substances. This is also dependent on your idea of polar compounds and ionic compounds. So from basic principle of 'like dissolve like' polar or ionic substances dissolve polar or ionic substances. Thats it.


Will mixing any cation with any anion lead to an insoluble compound?

If that were true, there would be no soluble ionic compounds. Since there are soluble ionic compounds, the answer must be no.



What must be a product of a double reaction?

two ionic compounds in aqueous solution.



Why do you need to balance the numbers in an ionic compound what does this do?

We need to balance the number in an ionic compound b/c Ionic Compounds must be Neutral which means that is No Charge=0


Is ionic compounds minerals?

Not necessarily.There are several requirements for a substance to be considered a mineral.It must be formed naturally.It must be solid.It must have a definite structure.It must be inorganic.Some ionic compounds, such as sodium acetate, are organic, while many others are synthesized, such as sodium hydroxide or do not occur in nature such as silver nitrate.


Is clorine a covalent or ionic?

Chlorine, Cl2 is covalent. Any molecules which consist of two atoms of the same element must be covalent. In compounds with other elements chlorine can form ionic or covalent compounds.


How are the ions distinguished from one another in writing formulas for compounds?

When writing a chemical formula, you must recognize the ions which are a part of the ionic compound. To distinguish the ions from one another, you must classify the ions as the cations, the monatomic anions and polyatomic anions.


What do ionic and covalent compounds have in common?

All compounds, whether ionic or covalent, must contain at least two atoms per molecule. These compounds are formed because of the improved stability of the electron arrangement in the resulting molecules as compared to the consituent atoms before bonding.


Why do ionic compounds include at leastone metal?

Because ionic compounds must contain one negative ion and one positive ion. The metal always the positive ion and the nonmetal is the negative ion. hope that helps!


Are ionic bonds flammable?

Usually, no. For a bond to be flammable, it must contain either Carbon or Hydrogen. These are abundant in covalent bonds, but rarely seen in ionic compounds.


What is the charge of AuCl3?

AuCl3, Gold Chloride, is an ionic compound. The total positive charge must equal the total negative charge. Ionic compounds are electrically neutral.


Why won't ionic compounds conduct when they are in solid form?

In order for conduction to occur, there must be some free moving (delocalised) charged particle in the structure. When ionic compounds are solid, the positive and negative ions are held together in a giant lattice due to strong electrostatic forces. When ionic compounds are molten or in solution however, the ions can move, and therefore can conduct electricity


Why must roman numerals be used when naming certain ionic compounds?

It is a rule recommended by IUPAC to avoid confusion with coefficients.


Is Kr a ionic compound?

Krypton is a noble gas, and thus rarely forms any bond, ionic or covalent. When it does bond, it is usually covalent; however, krypton compounds are not found in nature and must be synthesized in a laboratory. Reports have also been made of ionic compounds with krypton, but these are only stable at extremely low temperatures.


Explain why do ionic compounds cannot exist as gases at NTP?

Ionic Ionic compounds do not exist as gases at 25°C and 1 atm, because cations and anions in an ionic solid are held together by very strong electrostatic forces; that is, forces between positive and negative charges. To overcome these attractions we must apply a large amount of energy, which in practice means strongly heating the solid. This is the reason for the question.


Why do iconic compounds have high melting points and boiling points?

I think you mean IONIC compounds. They have very strong bonds (called ionic bonds) holding the individual ions together in a crystal lattice when solid, and are still very strong in liquids. These must be overcome to melt and them to boil the substance.


Why must the total number of positive charges in an ionic compound equal the total number of negative charges?

Ionic compounds always want to have stability. The total numbers of positive and negative charges must equal each other so the ion can become stable.


How can you tell if a compound is ionic or molecular?

When you look at their formulas, you can easily distinguish between ionic and covalent (molecular) compounds. There is a limited number of elements which are nonmetals. You can easily memorize them: H , O , N , C , S , P , F , Cl , Br , I The others can be considered as metals. If the formula of a compound contains only the symbols of nonmetals, that compound is molecular (covalent) compound. For example; CH2O , PH3, H2O, CH3COOH, CON2H4. Your compounds are also covalent. HCl : both H and Cl are nonmetals. H2S : both H and S are nonmetals. If in any formula , you see only 1 symbol of a metal you can exactly say that it is an ionic compound. For axample: Li2Cr2O7 : both Li and Cr are metals. CuSO4 : only Cu is metal. NaNO2 : only Na is metal. Therefore these are all ionic compounds. But you must be careful. There is a polyatomic ion that creates a problem. It is "ammonium ion" = NH4^+ Since ammonium is a poly atomic ion it forms ionic salts. Therefore all ammonium salts are ionic. Example; NH4NO3, NH4Cl, (NH4)2SO4, (NH4)3PO4 The formulas of the given compounds do not contain the symbol of a metal, but they are ionic compounds. The formations of ionic and covalent compounds are different. Ionic compounds are formed by TRANSFERING electron(s) from a metal atom to a nonmetal atom. Covalent compounds are formed by SHARING of electrons by two nonmetals atoms. Therefore, by looking at their formulas we can also say that; HCl ; a covalent compound formed by sharing electrons by H and Cl atoms. H2S ; a covalent compound formed by sharing electrons by two H and S atoms. NaCl : an ionic compound formed by transfering electron from Na atom to Cl atom. K2S : an ionic compound formed by transfering electron from two K atoms to S atom. Determining the number of electrons transfered or shared is a different subject and requires the knowledge of electron configurations and valence electrons.


Why do ionic compounds conduct electricity when you melt them or conduct them in water?

As ionic compounds consist of ions, more precisely cations and anions, and when melted or dissolved in water the bond between ions breaks. Now the ions are separated, and thus have an electric charge (cations have a positive charge and anions a negative one). And as it is, in order for something to conduct electricity, that something must have a way to transfer electic current, which is charged particles (in this context: ions). And in a nutshell, that's why ionic compounds conduct electricity when melted or in water. Hope this helps :) (As to why ionic compounds don't conduct electricity when they're not either melted or in water: ionic compounds bound together produce a compound, which has no charge as a whole therefore, no ways to transfer charges :))


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