why is FeSCN2+ red in color and Fe3+ is yellow color?
403494
SCN is a strong field ligand (e.g. crystal field theory). The d orbitals are split but the energy gap between them widens. Therefore, higher energy light needs to be absorbed to affect the transition and lower energy light is reflected by the compound. Red light being reflected means that blue/violet light is being absorbed. Violet is the highest energy light, before you go into the UV spectrum.
294058
FeCl3 is a Lewis acid, because the Iron loses electron density because of the chlorines. So it complexes with the lone pair in water on the oxygen atom. In doing so, a proton is released from the water, which then complexes with the other water molecules to make H30+
214547
[Cr(en)3]Cl3  =  Tris(ethylenediamine)chromium (III)\ntrichloride\n\n[Fe(CO)3]  =  Iron carbonate or Iron (II) Carbonate\n\n[CoCl(NH3)5]Cl2  =  pentaamminechlorocobalt(III) chloride but it is [Co(NH3)5Cl]Cl2\n\nK3[Al(C2O4)3]  =  potassium triethanedioatealuminate(III)\n\nK3[Co(NO2)6]  =  potassium hexanitritocobaltate(III)\n\n[Fe(H2O)6]++  =  Hexaaquairon(II) chloride\n\nK[Ag(CN)2]  =  Potassium dicyanoargentate(I)
555396
try this\n\nhttp://antoine.frostburg.edu/chem/senese/101/inorganic/faq/iron-reactions.shtml
280179
Well I could make it as complex and confusing as some but I will keep it simple.  The color of a flame is determined by the material that is burning. The color also denotes temperature of a flame. (yes there are different degrees of hot). Sodium will give a yellow flame. Have a gas stove? Notice the flame has two colors of blue, the inner flame is a different shade than the outer shade, look at a match, the flame closest to the center of flame is yellowish while the outer is reddish. The center is hotter in both flames.\nAdding a chemical to the fire will change color, copper will burn blue, both from chemical and its flame hotter than the average yellow fire.  The quantity of flame or size is why we cant tell the difference in heat from all these small flames and we say they are hot.
875344
1) Litmus is red in acid, blue in base...so it would turn red in rainwater (which is sl acidic, more or less depending upon atm contamination), blue in ammonia.\n2) AgCl precipitates out...KCl + AgNO3--->AgCl(ppt) + K+ + NO3-\n3) Zn is more active than Fe, so it plates out at the expense of Fe...Zn(+2) + Fe--->Zn(ppt) + Fe(+2)\n4) Depends on the type of battery...for the lead/acid type it is a reversible reaction between PbO in the plates and the H2SO4 electrolyte (in overly simple terms)\n.....Discharge: 2H(+) + SO4(-2) + PbO--->PbSO4 + H2O\n.....Charge: PbSO4 + H2O--->PbO + 2H(+) + SO4(-2)
686000
it is a reddish color.  This is from the iron deposits on the surface that have oxidized(rusted).  Its like a rusty planet.
391994
Each color is obtained by using a different chemical or mixture of chemicals.  Many dyes and pigments involve heavy metal compounds, such as iron and copper.  For instance, iron oxide (rust) is used in some paints.  The color of a particular compound is determined by the frequencies of light it absorbs.
1026944
CoCl3.6NH3 yellow 3 [Co(NH3)6]Cl3 \nCoCl3.5NH3 purple 2 [Co(NH3)5Cl]Cl2 \nCoCl3.4NH3 green 1 [Co(NH3)4Cl2]Cl \nCoCl3.4NH3 violet 1 [Co(NH3)4Cl2]Cl \nThe green and violet compounds must have some further difference. \nAll have 6 ligands (coordination number = 6)
643732
The six cyanide (CN) radicals makes minus six charge. Fe can either have +2 or +3 charge. Even considering +3 for Fe, the net charge on [Fe(CN)6] is -6+3=-3 which can not be balanced by Zn as it can have only +2 charge. Because -3+2=-1 still remains i.e. charges are not balanced, the compound can not exist.
770385
FeCl3+3NaOH>>Fe(OH)3+3NaCl
881429
Fe2O3(s) + 3 CO(g) ----> 2 Fe(l) + 3 CO2(g)\n\nCount up the oxygens; the left side and right side oxygens should match.
958410
1.\nMn(s) + SnCl2(aq) --> MnCl2(aq) + Sn(s)\nCr(s) + 2HBr(aq) --> CrBr2(aq) + H2(g)\nCo(s) + CaBr2(aq) --> N.R\n2Al(s) + 3Ni(NO3)2(aq) --> 2Al(NO3)3(aq) + 3Ni(s)\n\n2.\nMg + 2AgNO3 --> Mg(NO3)2 + 2Ag\nmole of Ag = 3.580 / 108 = 0.033 mole\nmole of AgNO3 = 0.033 mole = 33 mmole\nmolarity of AgNO3 = 33 / 50 = 0.66 M\n\n3.\na.soluble\nb.soluble\nc.soluble\nd.insoluble\ne.soluble\nf.soluble\ng.insoluble in water, soluble in acid\nh.soluble\n\n4.\n3NaOH(aq) + Fe(ClO4)3(aq) --> Fe(OH)3(s) + 3NaClO4(aq)\n3Na+ + 3OH- + Fe3+ + 3ClO4- --> Fe(OH)3 + 3Na+ + 3ClO4-\nFe3+ + 3OH- --> Fe(OH)3\n(NH4)2SO4(aq) + Pb(NO3)2(aq) --> PbSO4(s) + 2NH4NO3(aq)\n2NH4+ + SO42- + Pb2+ + 2NO3- --> PbSO4 + 2NH4+ + 2NO3-\nPb2+ + SO42- --> PbSO4\n\nHope it helps\npeace\nvixklen
977750
Mn(+3) has the electronic configuration of 1s(2) 2s(2) 2p(6) 3s(2) 3o(6) 3d(2)\n\nthe one before me missed the 4s2 so his is wrong
181969
It loses electrons, so it gets a higher oxidation state. An example would be iron going to rust (Fe(s) --> Fe+3).
816320
Since chloride is an halogen, it has a charge of -1.\nBecause a molecule always have a charge of zero, the iron must be a positive charge.\nThere are three Cl, for a total of -3, and only one Fe, that has to have the whole +3 all to itself to balance out the -3 of the 3 Cl.
540870
Ferric monohydroxide pentahydrate ion\n\nor\n\nIron (III) monohydroxide pentahydrate ion