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- Which member of each pair gives the more basicsolution inwater: (a) CaO or SO₃; (b) BeO or BaO; (c) CO₂ or SO₂; (d) P₄O₁₀ or K₂O? For the pair in part (a), write an equation for the dissolving of each oxide to support your answer.Nitrous acid (HNO2) disproportionates in acidic solutionto nitrate ion (NO3- ) and nitrogen oxide (NO). Write abalanced equation for this reaction.(iv) Explain the following observations
- A fertilizer railroad car carrying 34,300 gallons of commercialaqueous ammonia (30% ammonia by mass)tips over and spills. The density of the aqueous ammoniasolution is 0.88 g>cm3. What mass of citric acid,C(OH21COOH21CH2COOH22, (which contains three acidicprotons) is required to neutralize the spill? 1 gallon = 3.785 L.Disulfides are compounds that have S— S bonds, like peroxideshave O— O bonds. Thiols are organic compoundsthat have the general formula R— SH, where R is a generichydrocarbon. The SH- ion is the sulfur counterpart ofhydroxide, OH-. Two thiols can react to make a disulfide,R— S— S— R. (a) What is the oxidation state of sulfur ina thiol? (b) What is the oxidation state of sulfur in a disulfide?(c) If you react two thiols to make a disulfide, are youoxidizing or reducing the thiols? (d) If you wanted to converta disulfide to two thiols, should you add a reducingagent or oxidizing agent to the solution? (e) Suggest whathappens to the H’s in the thiols when they form disulfides.(a) In 20 or less of yourown words define the term “leachate”and describe how it forms. (b) Previous records had shown that to prevent acute toxicity to organisms, the maximum mass of CdSO4 that should be allowed into the landfill was determined to be 0.1 kg. This was calculated using a standard concentration of Cd in mg/L where the volume of the leachate pond was used as 500 000L. (i) Provide the name of the CdSO4 compound. State the oxidation number of Cd in this compound (ii) You need to ensure that the concentration used to determine the mass of Cd allowed in the landfill, meets the current regulatory standard. Assuming that previous calculations determined that all of the CdSO4 would be deposited in the leachate pond, what standard concentration of Cd in mg/L was used to determine the maximum mass of allowable CdSO4?
- A 2.000-g sample of a soil is found to yield 3.73 mg of phosphorus after extraction. What is the concentration of phosphorusin the soil in parts per million?Like heavy water (D₂O), so-called “semi-heavy water”(HDO) undergoes H/D exchange. The scenes below depict aninitial mixture of HDO and H₂ reaching equlibrium.(a) Write the balanced equation for the reaction. (b) Is the valueof Kgreater or less than 1? (c) If each molecule depicted repre-sents 0.10 M, calculate K.Calc ulatetheconcantrationoF Potassiamioningrans Perliterof termixing loomlof0.250M Kel n 20oml of o loo M K 2Soa (atonic weight k 37-1ms(ma)
- Calculate the amount of lime(ar CaO) that Gn be propared by heating 200 kg of limestome that is 95% Pure Caos M.wt. CaCo3=loo M.Wt Go-56-| CaCos > Cao + Coz 11:09 PM16. Which of the following is intermolecular redox reaction :- СНО CH,OH OH (1) 2| СНО COOH (2) 2C,H;CHO Al(OC,H5 )3 CH,COOH + C,H,CH,OH (3) 4CrO, + 6H,SO, → 2Cr, (SO,); + 6H,O + 70, (4) As,S; + HNO; → H;AsO, + H,SO, + NOHow do you write a net ionic equation for the formation of gas ex Al2(SO4)3(NH4)2SO4 •24 H2O + NaOH --> ?