What part of a compound is mostly responsible for the colour?
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It is usually the metal. The metal responsible for the color can be the cation, like Cu+2 in blue CuSO4, or it can be in the anion, like CrO4= in yellow Na2CrO4. Sulfur is a nonmetal, but its presence in compounds intensifies the color. CuS is an opaque dark brown. The nonmetallic ion thiocyanate, CNS-, reacts with yellow ferric [iron(III)] ion to form a brilliant red complex.\n\nAdditional detail: The metal, of course!
1027887
Compounds are composed of two or more elements.\nElemental molecules are like the diatomic gases:\nF2, O2, N2, Cl2: composed of a single element.\nor the allotropes of sulfur :\n``Sulfur in the solid state ordinarily exists as cyclic crown-shaped S8 molecules. Sulfur has many allotropes besides S8. Removing one atom from the crown gives S7, which is responsible for sulfur's distinctive yellow color. Many other rings have been prepared, including S12 and S18. By contrast, its lighter neighbor oxygen only exists in two states of chemical significance: O2 and O3. Selenium, the heavier analogue of sulfur can form rings but is more often found as a polymer chain.´´
511345
The colour we perceive is the part of the visible spectrum which the material reflects.\n\nColour arises primarily due to electronic transitions. Electrons absorb energy at a particular frequency and radiate it at another. Organic dyes and paints have a lot ofdouble bonds which occur alternately, this is called a conjugated system.\n\nInorganic materails are colured due to the transtion of electrons among d-orbitals.
859386
Due to differences in chemical structures
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Typical colour of feces is due to bilirubin and biliverdin break down products.  These pigments are present in bile and ultimately are metabolites from haemoglobin.
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There are various means of determining this, and without any specific data on what elements are involved in the answer you are looking for, the link below is the best reference I can find that can answer this question in a mostly generalized way.
670357
If the colored solid is highly conjugated with at least 9 or more conjugated double bonds, then it is probably that color.\n\nAlso if it absorbs light at the frequency of the color complementary to green than there is no dye.\n\n\nMy recommendations: Filter-vac the solid over a buchner funnel and try various washes with different solvents both organic and inorganic.
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Blue, red, and yellow are primary colors. Purple, orange, and green are secondary colors.\n\nblue+red=purple\nred+yellow=orange\nblue+yellow=green\n\nComplementary colors of a primary color are the secondary color made when the other two primary colors are combined.\n\nRed and green are complementary.\nBlue and orange are complementary.\nYellow and purple are complementary.
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In some cases, yes, depending on what other elements are combined, however a mixture of gallium arsenide is found in almost every color.
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primary and secondary colors.\n\nThe primaries are red, blue and yellow.\n\nThe secondaries are formed by each pair of primaries.  Ie: orange (for yellow and red), etc...
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Hi,, hydrogen, oxygen, and nitrogen... \n\n good luck.....
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a. N2O4\nb.PCl5\nc.NF3\nd.S2Cl2
818017
Generally, a dye. You need to be more specific. What paper? What colour?
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potassium nitrate and sugar equal parts and a wick of some type or at least an ignition source. You can add certain elements to make different colors as well.
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All other common amino acids have a primary amino group. The primary amino group is essential for the formation of the purple chromophore.\nProline has a secondary amino group so the reaction is different\n\nHave a look at the link below
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any solution gives colour due to the fact that the outermost electrons absorb the energy and move to a highre orbit corrospondingly. when they come back to their orignal state, the enegry is emitted in the form of photons, which may have the wavelength crrspndngly to a colour.
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Mixture of the primary colors forms a secondary color. \nFor Example,\nGreen + Red  = Yellow\nGreen + Blue = Cyan\nRed+Blue+Green = White.