Recent questions in Chemistry

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Identify the number of stereoisomers for the compound 1,2-dichlorocyclopentane, and draw the structures for each stereoisomer, indicating which one is a meso compound.

asked Jan 30 in Organic Chemistry by Genie4306458 (310 points)

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1 answer 68 views

Using principles of inorganic chemistry, predict the stability of the following two inorganic compounds: 1) Sodium chloride (NaCl)2) Ammonium chloride (NH4Cl) Briefly explain the factors contributing to the stability of each compound based on their structures and bonding.

asked Jan 30 in Inorganic Chemistry by FrancescoB73 (310 points)

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1 answer 102 views

Identify whether the following solids are ionic, covalent, or metallic: (i) NaCl, (ii) CO2, (iii) Fe, (iv) SiO2, (v) Ag. Justify your answer with proper reasoning for each compound.

asked Jan 30 in Inorganic Chemistry by HelenaGodoy5 (290 points)

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1 answer 78 views

What is the concentration of lead (Pb) ions in a sample of a water source using the method of polarography?

asked Jan 30 in Analytical Chemistry by Breanna4436 (310 points)

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1 answer 68 views

What is the concentration of lead (Pb) ions in a given water sample using voltammetry with a reference electrode?

asked Jan 30 in Analytical Chemistry by Robin5573027 (280 points)

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1 answer 86 views

What is the concentration of lead (Pb) in a water sample, in units of micrograms per liter (µg/L), if the atomic absorption spectroscopy analysis showed an absorbance value of 0.456 at a wavelength of 283.3 nm?

asked Jan 30 in Analytical Chemistry by BessLithgow4 (420 points)

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1 answer 84 views

What is the concentration of lead (Pb) in a water sample collected from a river using atomic absorption spectroscopy?

asked Jan 30 in Analytical Chemistry by BobFryer6357 (410 points)

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1 answer 73 views

What is the concentration of lead (Pb) in a water sample collected from a nearby river, using atomic absorption spectroscopy?

asked Jan 30 in Analytical Chemistry by MoseBromley9 (410 points)

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1 answer 86 views

What is the concentration of lead (Pb) in a water sample collected from a local stream using atomic absorption spectroscopy? Provide a detailed analysis of the sample and a report of the results with proper calculations and units.

asked Jan 30 in Analytical Chemistry by Nydia78K370 (450 points)

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1 answer 68 views

What is the concentration of lead (Pb) in a water sample collected from a local river, and how does it compare to the maximum permissible limit set by the World Health Organization (WHO)? Determine the answer using atomic absorption spectroscopy and provide a detailed report including instrumental parameters, experimental procedure, and results.

asked Jan 30 in Analytical Chemistry by ShannaCorlis (540 points)

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1 answer 71 views

What is the concentration of lead (Pb) in a water sample collected from a industrial site using atomic absorption spectroscopy?

asked Jan 30 in Analytical Chemistry by PBHKassandra (310 points)

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1 answer 81 views

What is the concentration of lead (Pb) in a soil sample collected from a playground using X-ray fluorescence spectroscopy?

asked Jan 30 in Analytical Chemistry by CorneliusSpe (290 points)

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1 answer 67 views

What is the concentration of lead (Pb) in a drinking water sample using cyclic voltammetry?

asked Jan 30 in Analytical Chemistry by JulissaRusso (330 points)

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1 answer 66 views

What is the concentration of lead (Pb) and cadmium (Cd) in a water sample collected from a polluted river using atomic absorption spectroscopy?

asked Jan 30 in Analytical Chemistry by JavierDallas (210 points)

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1 answer 92 views

What is the concentration of iron(II) sulfate in a sample of water taken from a lake, using spectrophotometry with a known molar absorptivity of 11,300 L/mol*cm, if the absorbance of the sample is measured to be 0.423 at a wavelength of 510 nm?

asked Jan 30 in Analytical Chemistry by ClaudiaChamb (430 points)

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1 answer 71 views

What is the concentration of iron(II) sulfate in a 20 mL sample solution that has an absorbance of 0.45 at 562 nm, given that the molar extinction coefficient of iron(II) sulfate at that wavelength is 7,590 M^-1cm^-1?

asked Jan 30 in Analytical Chemistry by JakeGagner6 (350 points)

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1 answer 87 views

What is the concentration of iron(II) ions in a water sample that has an absorbance of 0.55 at 510 nm when treated with a standard solution of 4.65 x 10^-5 M iron(II) sulfate using colorimetry?

asked Jan 30 in Analytical Chemistry by NickolasHarv (350 points)

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1 answer 71 views

What is the concentration of iron(II) ions in a sample of water collected from a local pond using colorimetry, if the measured absorbance of the sample at 565 nm is 0.673 and the molar absorptivity of the iron(II) complex at this wavelength is 20,500 M⁻¹·cm⁻¹?

asked Jan 30 in Analytical Chemistry by DongCarrier (430 points)

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1 answer 61 views

What is the concentration of iron ions in a water sample collected from a local lake using polarography technique?

asked Jan 30 in Analytical Chemistry by RhysDelgado0 (170 points)

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1 answer 75 views

What is the concentration of iron ions in a sample of tap water using spectrophotometry?

asked Jan 30 in Analytical Chemistry by LeiaLuong327 (390 points)

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