Chemistry question and answers for August 29, 2023
- Q Use the table to calculate the total Calories in each food.Calorie Content and Examples of Carbohydrates, Proteinsand FatsType of biomoleculeRepresentative foodsCalorie content (Cal/g)carbohydratesrice, potatoes, bread, vegetables, fruit, whole milk4proteinsfish, meat,...
- Q what is the ph of a 0.10m solution of nacn at 25°c(ka=4.9×10^-10 for hcn). I've gotten 5.15 as a pH but the correctanswer is 11.15. I don't see how it's...
- Q A water sample is prepared by adding 10-4M NaCl, 10-3 M NaHCO3and 10-4 M CaCl2 to water. Assume that when these salts dissolve,they dissociate to Na+, Cl- , Ca2+, and...
- Q 1.)Calulate the E degree for the following reactionsZn2+ + 2Ag ---> Zn + 2Ag+2H+ + Fe ---> H2 + Fe2+Ni2+ + Cu ---> Ni + Cu2+2.) Using the E degree...
- Q 1. Calculate how to make 500.0 mL of 0.100 M triethanolaimesolution.2. You need to prepare a buffer for biochemistry lab. Therequired solution is 0.5 M sodium phosphate, pH 7.0. Use...
- Q in the synthesis of propyl acetate 4ml of propanol and 4.5 ml ofacetyl chloride was used what is the percent yield if a massproduct of 3.04 grams ? was obtained
- Q Mg(s)+2H2O(l)→Mg(OH)2(s)+H2(g).Calculate the number of grams ofMg needed for this reaction to release enough energy to increasethe temperature of 75 mL of water from 21 ∘C to 76 ∘C. Calculatethe standard...
- Q As the concentration of both hydrochloric acid and acetic acidapproach .0001 M, the pH values are converging. Why does thisoccur?
- Q What is the conjugate acid of each of the following bases? Writethe equilibrium reactions in aqueous solution for each base.1) Se2-.2) HPO42-.3) ClO3-.4) [Co(NH3)5(OH)]2+.5) SeO4-.
- Q In a reaction bromobenzene is reacting with NO2+ cation to formC6H4NO2Br +C6H3N2O4Br +C6H2N3O6Br Determine the m/z values forbromobenzene and its potential mono-, di-, and tri-nitroderivatives.
- Q Identify the group or period that contains the noble gases.period 2group 8Agroup 7Agroup 6Aperiod 1period 3Identify the group or period that contains B, N, and Fperiod 1group 7Aperiod 2group 6Agroup...
- Q Classify each of the following reactants and products as an acidor base according to the Bronstead theory:H3PO4 + C6H5O- >><< H2PO4- + C6H5OH
- Q Please explain, Im so confused!A. What is the vapor pressure in atm of a solution at 25 oCproduced by dissolving 138.4 g of dextrose (C6H12O6) in 376.4 g ofwater? Vapor...
- Q The bacterium nitrobacter can oxidize nitrite to nitrate as asource of energy for growth. Write a balanced chemical reaction forthe reaction of oxygen (g) with nitrite (aq) to form nitrate...
- Q How to calculate theoritical NOx and SO2 (mg/Nm3) in gases atcoal fired power plant, if known :Coal Calorific Value = 4500 kcal/kgFuel consumption = 180 t/hExcess air = 18%Oxygen in...
- Q Determine the coordination number and oxidation number of themetal in each molecule: 1) [Co(en)2Cl2]SCN ; 2) Na2[PdBr6] ; 3)[Pt(en)2](ClO4)2 ; 4) [Co(NH3)4(OH2)2]Cl3.
- Q (19) Ammonium formate, NH4(HCOO), dissolves in water to giveammonium ions and formate ions. These ions then undergo anunfavorable and endothermic Brønsted acid- base reaction accordingto this equation:NH4+ (aq) + HCOO–...
- Q A 1.0-L buffer solution contains 0.100 molHC2H3O2 and 0.100molNaC2H3O2. The value of Ka for HC2H3O2 is 1.8×10−5 Calculate thepH of the solution upon addition of 39.8 mL of 1.00 MHCl...
- Q Calculate molar solubility of ZnCO3 in a buffersolution of pH = 7
- Q The average molecular weight of the triglycerides in coconut oilis 680 g/mol. How much NaOH (in grams) is required to completelysaponify this oil? Why is it important to use less...
- Q The common laboratory solvent ethanol is often used to purifysubstances dissolved in it. The vapor pressure of ethanol,CH3CH2OH, is 54.68 mm Hg at 25 °C. In a laboratory experiment,students synthesized...
- Q The very useful restriction enzyme SpoBob hydrolyses thephosphodiester bond between the guanylates in the sequence AGGACCA.Is SpoBob generating blunt or sticky ends? Please explain.this is actually biochemistry
- Q How does soap remove an oil spot?
- Q Pyridine is used in the synthesis of tosyl chloride from tosicacid, and also in reactions that involve tosylate esters. Whatcharacteristic of pyridine makes it the base of choice for thesereactions?...
- Q Briefly describe how you would determine whether a given saltwill produce an acidic, basic, orneutral solution when dissolved in water.
- Q The concentration of NO3– in a water sample is determined by aonepoint standard addition using a NO3– ion-selective electrode. A25.00-mL sample is placed in a beaker and a potential of...
- Q Talking about Chromatography using kool aid, 70% isopropanol,25% isopropanol and 5% isopropanol what is the answer to thequestions?1. Describe h0w you think the separation is occurring. What isthe mechanism of...
- Q Synthesis of potassium trioxalatoferrate (volumetric techniquesand KMnO4 titration)Work the following problems:a. suppose you have as much 0.03200 M KMnO4 as you need. Stateexactly what data must be recorded in order...
- Q Chemists use plots of solubility of a slightly soluble salt(y-axis) versusconcentration of some other reagent(x-axis) to describesolubility behavior.Sketch plots labeling the axes for the followingsituations:A: the solubility of BaCO3 as...
- Q How could you dissociate a diatomic molecule, at equilibrium,without changing the temperature of the system? [Suggested keywords: equilibrium constant, concentration, ratio,volume...]This is a P-Chem problem
- Q A student starts with   4.586 g  ofunknown mixture of Na2CO3 andCaCl2•2H2O. Theycollect   1.356 g  of precipitate. Theyidentified Na2CO3 as their limitingreagent.How many grams of CaCl2•2H2O did theunknown mixture originally contain?ive tried 3.230...
- Q 1. A loam-textured soil has from 50 to 100 square meters ofsurface area per gram of soil. Assume you had 100 grams of aloam-textured soil, and its S.A. was 75...
- Q classify the following compounds in strong electrolyte or weakelectrolyte and indicate the species that produce in aqueoussolution:1. Li3PO42.NaClO23.CaSO44.RbOH5.H2S6.HlO37.Sr(OH)28.AgC2H3O29.Al2(SO4)310.(NH4)3Cr2O711.K3AsO412.LiCl13.Na2C2O414.Fe(OH)315.Bi(OH)316.Sb2S317.Al2(CO3)318.CuSO419.Hl
- Q A 100.0 mL solution containing 0.756 g of maleic acid (MW =116.072 g/mol) is titrated with 0.217 M KOH. Calculate the pH ofthe solution after the addition of 60.0 mL...
- Q The haf reaction occuring in the standard hydrogen electrode\"SHE\" is2H+ (aq) +2e- <=> H2 (g)a) What is the EMF for this half-cell?b) How is the EMF value listed in part...
- Q IF5Polar BondsYesNoDipole MomentYesNoTeBr4Polar BondsYesNoDipole MomentYesNoNH2−Polar BondsYesNoDipole MomentYesNoPBr3Polar BondsYesNoDipole MomentYesNoIO2−Polar BondsYesNoDipole MomentYesNo
- Q Given the following atomic weights, that the density of aceticacid is 1.05, and that 5.3 g of isoamyl alcohol, 7.6 mL of aceticacid, and 0.5 mL of sulfuric acid make...
- Q The following reactions are important ones in catalyticconverters in automobiles. Calculate ΔG∘ for each at 298 K. Predictthe effect of increasing temperature on the magnitude of ΔG∘.A. 2CO(g)+2NO(g)→N2(g)+2CO2(g)B.5H2(g)+2NO(g)→2NH3(g)+2H2O(g)C.5H2(g)+2NO(g)→2NH3(g)+2H2O(g)D.2H2(g)+2NO(g)→N2(g)+2H2O(g)E.2NH3(g)+2O2(g)→N2O(g)+3H2O(g)
- Q Derive Clapeyron equation and Clausius modification forliquid-vapor equilibrium conditions.
- Q When 22.0 mL of a 3.68×10-4 M silver nitrate solution iscombined with 25.0 mL of a 1.80×10-5 M sodium sulfate solution doesa precipitate form? (yes or no)For these conditions the...
- Q Consider the following reaction between sulfur trioxide andwater:SO3(g)+H2O(l)=H2SO4(aq)A chemist allows 61.5 g fo SO3 and 11.2 g of H2O to react. Whenthe reaction is finished, the chemist collects 51.0g of...
- Q A 30.0-mL sample of 0.165 M propanoic acid is titrated with0.300 MKOH.A.)Calculate the pH at 0 mL of added base.B.)Calculate the pH at 5 mL of added base.C.)Calculate the pH...
- Q why are Co2+ complexes labile with respect to ligand exchangewhile Co3+ complexes are relatively inert?
- Q Which of the following descriptions and/or equations bestrepresents the enthalpy change of a system? There may be more thanone correct answer. A. The heat absorbed or released during a phasechange...
- Q 5. A sample of orange juice is found to have a pH of 3.45.What is the hydroxide concentration in the orange juice?a. 1.03x10-5b. 10.55x10-11c. 3.16x10-4d. 2.818x10-116. The Kc for the...
- Q The formation constant* of [M(CN)2]– is 5.30 × 1018, where M isa generic metal.A 0.160-mole quantity of M(NO3) is added to a liter of 0.720 MNaCN solution. What is the...
- Q 1) Ammonium bisulfide, NH4HS, forms ammonia, NH3, and hydrogensulfide, H2S, through the reactionNH4HS(s)⇌NH3(g)+H2S(g)This reaction has a K value of 0.120 at 25 ∘C.an empty 5.00-L flask is charged with 0.400...
- Q A student collected the following data while using the proceduredescribed in this module: 27.13 mL of 1.00 x 10^-2M EDTA soltuionwas required to reach the ErioT end point for titration...
- Q Give two reasons why the Co3+ substitution mechanism isdissociative/ID instead of associative/IA
- Q The formation of a dipeptide is the first step toward thesynthesis of aprotein molecule. Consider the following reaction:glycine (aq) + glycine (aq) Ã glycylglycine (aq) + H2O (l)Given that the...
- Q Glycogen is the body’s storage form of glucose. Whenglycogen is degraded, glucose 1-P is formed. Glucose 1-P can thenbe isomerized to glucose 6-P. Starting with glucose 1-P and endingwith two...
- Q In anaerobic cells glucose C6H12O6 is converted to lactic acid:C6H12O6 → 2CH3CH(OH)COOH. The standard enthalpies of formation ofglucose and lactic acid are –1274.45 and –694.04 kJ/mol,respectively. The molar heat capacities...
- Q 1) The reversible chemical reactionA(aq)+B(aq)⇌C(aq)+D(aq)has the following equilibrium constant:K=[C][D][A][B]=5.2a) Initially, only A and B are present, each at 2.00 mol L−1.What is the final concentration of A once equilibrium isreached?b)...
- Q 386 km/s = _______ cm/s ?386 km/s = ________ m/ms ?1270 g/L = _______ g/mL ?1270 g/L = ________ kg/mL ?615 mK/s = _______ K/s ?615 mK/s = ________ μK/ms?2.999...
- Q Sketch a titration curve for 50 mL of 0.10 M HCl titrated with0.15 M NaOH.Include on the graph:a) The initial pHb) The volume of the equivalence pointc) The pH at...
- Q Calculate the pH for each of the following cases in thetitration of 50.0 mL of 0.200 M HClO(aq) with 0.200 M KOH(aq). Theionization constant for HClO can be found asfunction_parent.followURL,http://sites.google.com/site/chempendix/ionization(a)...
- Q How would set up a serial dilution to cover aconcentration range from approximately 21 µM to 120 µM of DHF inanassay (in the well) having a total volume of 200...
- Q What are the most important kind of intermolecular forcespresent in the following substances?i) toluene, C7H8 (l)ii) mercury , Hg (l)iii) ammonia, NH3 (l)b) Of the substances F2, Kr, CH4, and...
- Q chemical engineering*An adult human being at rest produces roughly 0.40 mJ/h of thermalenergy through metabolic activity. Use that fact to solve thefollowing problems.(a)A college student who weighs 128 pounds put...
- Q A cell membrane at 37°C is found to be permeable to Ca2+ but notto anions, and analysis shows the inside concentration to be 0.100M and the outside concentration to be...
- Q Explain why first electron affinities for neutral atoms tend toincrease going across a period (i.e., from left to right) and up agroup (i.e., bottom to top) in the Periodic Table.
- Q A) Calculate the mass defect of the oxygen nucleus16Â Â 8O. The mass of neutral 16Â Â 8O is equal to15.994914 atomic mass units. Answer in amu.B) Calculate the binding energy E of the...
- Q Consider the following system at equilibrium where Delta H° =108 kJ, and Kc =1.29×10-2, at 600K.COCl2(g) <--->CO(g)+  Cl2(g)  If the VOLUME of the equilibrium system issuddenly  increased at constanttemperature:The value of KcA. increases.B....
- Q How do metal salts affect catalase activity? Why are some metalsalts considered to be activators and others are considered to beinhibitors? How do you know if a metal salt is...
- Q what is the mechanism to get ornithine fromglutamate-5-semialdehyde
- Q Draw the lewis structures of the polyatomic ions and assignformal changes of NH4+ and CO3 2-
- Q Consider the titration of a 23.0 −mL sample of 0.180 M CH3NH2with 0.145 M HBr. Determine each of the following.Part Athe initial pHExpress your answer using two decimal places.pH =11.95SubmitMy...
- Q Complete the following paragraph to explain the relationshipbetween nicotinic and muscarinic cholinergic receptors
- Q Why do we use kcat (also called turnover number) and not Vmaxwhen we characterize the properties of an enzymecatalysedreaction?Please explain to me in details. Thank you!
- Q Explain how metal ions can form part of the structure ofenzymes, and also how it can contribute to catalysis
- Q Make 0.3M from 1M stocks. Each measurement will require 3 ml ofsolution in a glass test tubea) Glucose, 0.3 Mb) Ethanol, 0.3 M (Density = 0.789g/ml and 46.1g/mol)c) Methanol, 0.3M...
- Q (a) Explain why there is no distinction between low- andhigh-spin arrangements for an octahedral d8 metal ion. (b) Discussthe factors that contribute to the preference for forming either ahigh- or...
- Q For determination 1:Initial concentration for H2C2O4: 0.31 mol/LInitial concentration for KMnO4: 0.011 mol/LAverage elapsed time: 170 secondsReaction rate: ??? mol/L * sDetermination 2:Initial concentration for H2C2O4: 0.63MInitial concentration for KMnO4:...
- Q Calculate the pH for each case in the titration of 50.0 mL of0.200 M HClO(aq)0.200 M HClO(aq) with 0.200 M KOH(aq).0.200 MKOH(aq). Use the ionization constant for HClO.What is the...
- Q Sorbic acid (HC6H7O2) is a weak monoprotic acid withKa=1.7×10−5. Its salt (potassium sorbate) isadded to cheese to inhibit the formation of mold.What is the pH of a solution containing 11.75...
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