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Three Lewis structures are pictured and labeled, “a,” “b,” and “c.” Structure a shows a nitrogen atom with one lone pair of electrons single bonded to three hydrogen atoms. The structure is labeled “ammonia.” Structure b shows a nitrogen atom with one lone pair of electrons single bonded to two hydrogen atoms and a chlorine atom with three lone pairs of electrons. The structure is labeled “chloramine.” Structure c shows two nitrogen atoms, each with one lone pair of electrons, single bonded to one another and each single bonded to two hydrogen atoms. The structure is labeled “hydrazine.”

Chloramine, NH 2 Cl, results from the reaction of sodium hypochlorite, NaOCl, with ammonia in basic solution. In the presence of a large excess of ammonia at low temperature, the chloramine reacts further to produce hydrazine, N 2 H 4 :

NH 3 ( a q ) + OCl ( a q ) NH 2 Cl ( a q ) + OH ( a q )
NH 2 Cl ( a q ) + NH 3 ( a q ) + OH ( a q ) N 2 H 4 ( a q ) + Cl ( a q ) + H 2 O ( l )

Anhydrous hydrazine is relatively stable in spite of its positive free energy of formation:

N 2 ( g ) + 2H 2 ( g ) N 2 H 4 ( l ) Δ G f ° = 149.2 kJ mol 1

Hydrazine is a fuming, colorless liquid that has some physical properties remarkably similar to those of H 2 O (it melts at 2 °C, boils at 113.5 °C, and has a density at 25 °C of 1.00 g/mL). It burns rapidly and completely in air with substantial evolution of heat:

N 2 H 4 ( l ) + O 2 ( g ) N 2 ( g ) + 2H 2 O ( l ) Δ H ° = −621.5 kJ mol 1

Like ammonia, hydrazine is both a Brønsted base and a Lewis base, although it is weaker than ammonia. It reacts with strong acids and forms two series of salts that contain the N 2 H 5 + and N 2 H 6 2+ ions, respectively. Some rockets use hydrazine as a fuel.

Phosphorus hydrogen compounds

The most important hydride of phosphorus is phosphine, PH 3 , a gaseous analog of ammonia in terms of both formula and structure. Unlike ammonia, it is not possible to form phosphine by direct union of the elements. There are two methods for the preparation of phosphine. One method is by the action of an acid on an ionic phosphide. The other method is the disproportionation of white phosphorus with hot concentrated base to produce phosphine and the hydrogen phosphite ion:

AlP ( s ) + 3H 3 O + ( a q ) PH 3 ( g ) + Al 3+ ( a q ) + 3H 2 O ( l )
P 4 ( s ) + 4OH ( a q ) + 2H 2 O ( l ) 2HPO 3 2− ( a q ) + 2PH 3 ( g )

Phosphine is a colorless, very poisonous gas, which has an odor like that of decaying fish. Heat easily decomposes phosphine ( 4PH 3 P 4 + 6H 2 ) , and the compound burns in air. The major uses of phosphine are as a fumigant for grains and in semiconductor processing. Like ammonia, gaseous phosphine unites with gaseous hydrogen halides, forming phosphonium compounds like PH 4 Cl and PH 4 I. Phosphine is a much weaker base than ammonia; therefore, these compounds decompose in water, and the insoluble PH 3 escapes from solution.

Sulfur hydrogen compounds

Hydrogen sulfide, H 2 S, is a colorless gas that is responsible for the offensive odor of rotten eggs and of many hot springs. Hydrogen sulfide is as toxic as hydrogen cyanide; therefore, it is necessary to exercise great care in handling it. Hydrogen sulfide is particularly deceptive because it paralyzes the olfactory nerves; after a short exposure, one does not smell it.

The production of hydrogen sulfide by the direct reaction of the elements (H 2 + S) is unsatisfactory because the yield is low. A more effective preparation method is the reaction of a metal sulfide with a dilute acid. For example:

FeS ( s ) + 2H 3 O + ( a q ) Fe 2+ ( a q ) + H 2 S ( g ) + 2H 2 O ( l )

It is easy to oxidize the sulfur in metal sulfides and in hydrogen sulfide, making metal sulfides and H 2 S good reducing agents. In acidic solutions, hydrogen sulfide reduces Fe 3+ to Fe 2+ , MnO 4 to Mn 2+ , Cr 2 O 7 2− to Cr 3+ , and HNO 3 to NO 2 . The sulfur in H 2 S usually oxidizes to elemental sulfur, unless a large excess of the oxidizing agent is present. In which case, the sulfide may oxidize to SO 3 2− or SO 4 2− (or to SO 2 or SO 3 in the absence of water):

Questions & Answers

please what is a lightening thunder?
Onimisi Reply
wat are hydrocarbon s
Opio Reply
I think they are molecules that comprise only of hydrogen and carbon atoms ( they are organic if I'm not mistaken)
am new here can I join
yes u can
give two properties of liquid
Grace Reply
molecules are slightly packed and they follow the shape of a container.
hello everyone, please am preparing for next year WAEC please
two: you can slip your fat arse by stepping on it 😁
anyone with notes of ionic equilibrium
what is measurement
Isaiah Reply
is the comparison of an unknown quantity with a fixed quantity of the same kind
How does an element differ from a compound? How are they similar?
Adeola Reply
an element is an indivisible particles that can take part in a reaction and consist of smaller or tiny particles i.e proton, neutrons and electron while a compound is when two or more element chemically combine together. They are similar when they are homogeneous compound. they take the same rxn.
an element is s chemically pure substance containing a particular type of atoms.. A COMPOUND is a substance containing atoms from different elements..
How to get the Lewis formula of SeCl+3
Erica Reply
hi,I'm new here can I join the conversation
what is the structural formula for starch
EZEA Reply
Starch is a mixture (of chemicals) of amylose and amylopectin. Both are macromolecules and polymers. You can search on wikipedia.
what is the roles of filter bed
what is the roles of Alu m
what is the roles of chlorine
Roles can be classified or correlate it to different areas: For example: Chlorine can be used in reactions (in industry) to manufacture HCl, which then can be used for other things. Or in swimming pools to kill bacteria. Or as a component in compounds with pharmaceutical roles (drugs). For Al:
Its dentisty value is suitable to be used in alloys (mixture of metals) in aircraft bodies. Also, Aluminium foils, Tin cans,.. Some of them are also in Al overhead cables in streets and long roads.
what is chemistry
what is the meaning of exceedingly
Yushao Reply
it is an adverb which means extremely
what is atomic chemistry?
Gladys Reply
Lewis structure for no3
Lewis structure for no3
Lewis structure for no3
what is weak acid
Muhammed Reply
It is an acid which partially ionises in water.
what is incandescence
what makes it glow
why is it red, irange and yellow in color
hello am new here and I want to join you
hello i am new here please i want to join this group
Hi, I'm also new here
hello guys !!
what is pressure?
Slark Reply
The force applied to suction Area of the body
Matter composed of exceedingly small paticle called atom.
questions related to metals
Regina Reply
occurrence and preparation of the representatives metals
list the 20, periodic table and their symbols
Fathmat Reply
hydrogen:h helium;he lithium:l beryllium:be Boron:b Carbon;C Nitrogen:n Oxygen:O FLUORINE:f Neon:n Sodium:s Magnesium:mg Aluminum:a Silicon:s Phosphorus:p Sulphur:s Chlorine:c Argon;a Potassium:p Calcium:c
Hydrogen, helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, neon, sodium, magnesium, aluminium, silicon, phosphorus, sulphur, chlorine, argon, potassium, calcium
there are 118 known elements ...you numbnuts
what is a solute
Ekezie Reply
Any substance that is disolved in a liqid solvent to create a solution
sorry liquid
it's a liquid substance
hello group
is the substance that dissolves in the solvent
so is HCl ionic compound
Honest Reply
No, covalent compound ➡️ molecule. As both H and Cl are non-metals and and form covalent bind by sharing valence e-. But can fully ionice in water forming H+ (a proton, a reason for acidity) and Cl- (anion =Chloride) Hydrogen Chloride is a gas at room; Hydrochloric acid = HCl (aq), dissolved in w
Form covalenr bond*
The question marks are an emoji in the first sentence is an unread emoji. HCl Covalent compund -> molecule
Practice Key Terms 3

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Source:  OpenStax, Chemistry. OpenStax CNX. May 20, 2015 Download for free at http://legacy.cnx.org/content/col11760/1.9
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