Chemistry question and answers for September 30, 2023
- Q Glycogen is reducing or non-reducing ? If can explain the reasontoo ? It is a Biochemistry related question.
- Q 1) You are given a solid hydrate. You dry and weigh a sampletube. You put in the hydrate and reweigh.You heat the tube and contents to drive off any water...
- Q Outline the steps to calculate the initial pHin the titration of a strong acid with a strong base?Outline the steps to calculate the pH beforethe equivalence point of the titration...
- Q Analyze Carnot Cycle for ideal gases
- Q Calculate the amount of ATP in kg that is turned over by aresting human every 24 hours. Assume that a typical human contains~50g of ATP (Mr 505) and consumes ~8000...
- Q Consider a gas phase reaction, 2A+B −↽−⇀− 3C+2D. When 1.00 mol Aand 2.00 mol B, and 1.00 mol D were mixed and allowed to come toequilibrium at 25◦ C and...
- Q two solutions can be found on either side of a semi-permeablemembrane. a 4.0m sucrose solution is found on the left side and a2.0m Nacl solution is found on the right...
- Q Plastic cup CMass of cup, water, and stirrer: 57.24gMass of sodium bicarbonate: 2.02gMass of citric acid: .76gTotal mass: 60.02gMass of cup, the solution, and stirrer after reaction:59.53gDifference: 0.49gH3C6H5O7(aq) +3NaHCO3(aq)--->Na3C6H5O7(aq) +3H2O(l)...
- Q You have a solution that is 0.25M Ca2+ and .18M Ag+. You beginto add CO32- (carbonate ion) to form CaCO3 , andAg2CO3. Which will precipitate first? Second?What is the concentration...
- Q A 10.45-m3 sample of gas (310K, 745mmHg pressure) waspassed through a series of traps that removed teh water from thegas. The gas that came out was found to be at...
- Q You determined the theoretical yield if 0.5 moles of zinc isused to form ZnI2. Determine the percent yield if 515.6g of product is recovered.___ Zn + __I2 → ___ZnI2
- Q Thefollowing IUPAC name is incorrect. Correct it.1,1-dimethyl-2-cyclohexene
- Q A student is asked to standardize a solution of bariumhydroxide. He weighs out 0.989 g potassium hydrogen phthalate(KHC8H4O4, treat this as a monoprotic acid). It requires 25.0 mL ofbarium hydroxide...
- Q A voltaic cell consists of Cu²âº/Cu and Cd²âº/Cd half-cells. Eachcompartment has a volume of 0.500 L with the following initialconcentrations: [Cu²âº] = 1.250 M; [Cd²âº] = 0.250 M at 25°C....
- Q Be sure to answer all parts. Calculate the volume in mL of asolution required to provide the following:(a) 2.24 g of sodium chloride from a 0.415 M solution ___mL(b) 5.40...
- Q Based on the calculated values of Kc for each reactionstoichiometry, which reaction is the valid one?Fe(aq)3+ + SCN(aq)- FeSCN(aq)2+ The average value of Kc:369.10Fe(aq)3+ +2 SCN(aq)- Fe(SCN)2(aq)+ The average value...
- Q A science teacher tells her class that their final projectrequires the students to measure a specific variable and determinethe velocity of a car with no more than 2.5% error. Jennifer...
- Q Which of the following statements best describes a metabolicpathway?1.the set of molecular reactions in which enzymes make or breakdown sugars2.chemical reactions that do not involve the use of enzymes andthat...
- Q how many grams of H2O can be produced when 45.5g ofC3H8 reacts?
- Q iswater soluble or not soluble in the following solutes:a) KMnO4b) I2c) sucrosed) vegtable oilis Cyclohexane soluble or not soluble in the followingsolutes:a) KMnO4b) I2c) sucrosed) vegtable oil
- Q 1.)Calculate the percent ionization of a 0.419 M solution ofhydrofluoric acid.% ionization = ????2.) in the laboratory a student measures the percentionization of a 0.463 M solution of acetylsalicylic acid...
- Q A 1.000 g sample of copper reacts with an unknown element X toform 1.908 g Cu5X9. What is element X??
- Q Polypropylene has a degree of crystallinity that is dependent onits tacticity. Why?
- Q Analyze how how efficiency can be just a function of the twotemperatures for Carnot Cycle of ideal gas.
- Q The reaction CH2Cl2 (g) --> CH4 (g) + CCl4 (g) has Kp = 1.33at 400K. A 5.00L reaction vessel is evacuated, and 15.00 g ofCH2Cl2 (l) is added to the...
- Q In each of the following questions, assume that there is novolume change when HCl is added to water in part (a) or thephosphate buffer in part (c).(a) Calculate the pH...
- Q Some measurements of the initial rate of a certain reaction aregiven in the table below.N2H2initial rate of reaction1.07M2.15M/17.0Ms1.07M0.951M/7.52Ms4.35M2.15M/281.MsUse this information to write a rate law for this reaction, andcalculate the...
- Q Over what pH range(s) could valine be used as an effectivebuffer? Explain your answer, supporting it with what we havediscussed about buffers and amino acids
- Q What is the pH of a solution prepared by adding 1.46g ofNaNO2 to 143.00 mL of water? (Base Ionization Constantfor NaNO2 = 2.22E-11)
- Q The hydronium ion concentration of an aqueous solution of 0.497M triethanolamine (a weak base with the formula C6H15O3N) is ...[H3O+] = _ MThe pOH of an aqueous solution of 0.462...
- Q 1.)Determine the pH change when 0.117 mol KOH is added to 1.00 L of abuffer solution that is 0.453 M in HNO2 and 0.339 M in NO2^-.pH after addition -...
- Q Nitric acid and magnesium hydroxide react to form magnesiumnitrate and waterA) how many moles are in 83.1 ml of 1.581M nitric acid?B) how many moles r in 54.3ml of 1.815M...
- Q 1. (9 pts) Consider a buffer solution composed of C6H5NH3+ andC6H5NH2. (Kb for the amine base is 3.9 x 10-10)a. What is the optimum buffer range for this mixture?b. What...
- Q A) For the following reaction, 4.22 grams of carbon (graphite)are allowed to react with 15.1 grams of oxygen gas. carbon(graphite) (s) + oxygen (g) carbon dioxide (g) What is the...
- Q Quantum numbers arise naturally from the mathematicsused to describe the possible states of an electron in an atom. Thefour quantum numbers, the principal quantum number (n),(n), theangular momentum quantum number...
- Q A buffer solution is composed of 1.723 g ofKH2PO4and 5.351 g ofNa2HPO4 . ( ka for dihydrogen phosphate ion is 6.2x10^-8 .)pH =Â Â Mass =Â Â gA-What is the pH of the buffer...
- Q What would the pH of a solution containing 3.24g of an acid HX(Molar Mass of HX = 70.00 g/mol) after the addition of 1.49g ofNaX? Assume no volume change to...
- Q write the complete balanced molecular, complete ionicand net ionic equation for the following: (All startingsolutions are in a (aq) form)- Calcium Chloride CaCl2 + Silver Sulfate Ag2SO4- Calcium Chloride CaCl2...
- Q Aqueous hydrobromic acid HBr willreact with solid sodium hydroxide NaOH toproduce aqueous sodium bromide NaBr andliquid water H2O.Suppose 2.4 g of hydrobromic acid is mixed with 0.876 g of sodiumhydroxide....
- Q PLEASE ANSWER THOROUGHLY AND BREAK DOWN EACH STEP. THANKYOU!!Characteristics of Chemical EquilibriumThe purpose of this lab is to investigate how changing variousfactors affect an equilibrium system. This lab consists of...
- Q 1.What is the pH at the equivalence point when 0.100 M weak acidHA (Ka = 1.48 x 10 - 4) is titrated with 0.050 M KOH?2.Calculate the pH of a...
- Q Consider a diporitc acid, H2A, where Ka1 =8.41E-4 and Ka2 = 2.36E-9. Answer the followingquestions regarding this solution:If the initial concentration of the acid is 0.66M, what is the pHof...
- Q Indicate how you would carry out each of the followingreactions. How would you distinguish between the starting materialand product by IR? Your answer should include both disappearance aswell as appearance...
- Q A buffer contains 0.11 mol of propionic acid (C2H5COOH) and 0.17mol of sodium propionate (C2H5COONa) in 1.20 L. What is the pH ofthis buffer?What is the pH of the buffer...
- Q what would the reaction be for the crystallization of sodiumacetate trihydrate in liquid water?
- Q Draw the Lewis Dot Structure for the following compounds andthen determinea) the hybridization of the central atomb) the electron group arrangementc) the bond angle around the central atomd) the molecular...
- Q Calculate the pH at the stoichiometric point when 25 mL of0.089M formic acid is titrated with 0.33 M NaOH.Calculate the pH at the stoichiometric point when 25 mL of 0.096M...
- Q What is the Molecular formula of Epsom? Explain the medicalimplementation of the Ep som, and what is used for?i need help please
- Q A heat lamp produces 22.0 watts of power at a wavelength of 6.8μm . How many photons are emitted per second? (1 watt = 1J/s). The answer needs to be...
- Q ANSWER TWO OF THE FOLLOWING QUESTIONS :A 24.1 mL sample of a 0.353 M aqueousacetic acid solution is titrated with a 0.426 Maqueous potassium hydroxide solution. What is the pH...
- Q Given the pH and absorbance of a solution. What equation would iuse to find the1.equilibrium concentration of the base? 2. equilibriumconcentration of the acid?
- Q Chapter 8: Electron Configurations and PeriodicityComplete for a thumbs up!a. Write the electronic configuration and draw the orbitaldiagram of iron.b. Create a table summarizing the group traits of elements.c. Explain...
- Q 1. Imagine that you model yourlungs as a 5 L sealed balloon at sea level: How would the pressureand temperature at 100 m below sea level affect the speed of...
- Q Fischer Synthesis of Isopentyl AcetateData:Inital Amounts: 1mL Isopentyl alcohol + 1.5mL glacial aceticacidamount of product collected = 1.727 gQuestion: Was the reaction successful? What was the actualyield? (You may need...
- Q a sample aqueous solution of iron(iii) sulfate has a mass of200g, a density of 1.05 g/cm^3 and 8.35 x10^21 atoms of sulfur.What is the molarity of the solution?
- Q 12. For each of the four problems below, consider the two pairsof atoms/ions/molecules. Which pair (i or ii) would be attracted toone another by the strongest intermolecular interaction? Justifyyour answer,...
- Q Show all of your work. Use the half-reactionmethodLi(s)+Co2(aq)+→Li(aq)+ +Co (s)Mg(s)+CuSO4(aq)→MgSO4(aq)+Cu(s)
- Q In two different experiments exactly 5 grams of fuel burns(combusts). The first experiment is under constant pressureconditions, and the second separate experiment is under constantvolume conditions.Which experiment is in a...
- Q Calculate the mass of Al in 14.6 g Al2(SO4)3.Calculate the mass in grams of Ba in 2.40 x 1023atoms of Ba.Calculate the number of moles in 26.50 g KFCalculate the...
- Q Microwaves are a type of radio waves. Microwave ovens typicallyuse microwaves with a wavelength of 12 cm. They are able to heatfoods because water molecules absorb the energy of the...
- Q How many different glycosides can be formed bylinking one D-glucopyranose and one D-galactopyranose? Explain yourreasoning.
- Q 32P is a radioactive isotope with a half-life of 14.3 days. Ifyou currently have 30.9 g of 32P, how much 32P was present 9.00days ago?
- Q Codeine (C18H21NO3) is anarcotic pain reliever titrated with HCL. What is the pH of a0.0500 M codeine hydrochloride solution with a pKa of5.80? Note the titrated form of codeine hydrochloride...
- Q An environmental chemist working for the EnvironmentalProtection Agency (EPA) was directed to collect razor clams from aheavily-contaminated river superfund site and analyze them forcadmium (Cd2 ) content using graphite furnace...
- Q Hydrogen holds promise as an environment-friendly fuel. How manygrams of H2 gas are present in a 54.0 L fuel tank at apressure of 2501 lb/in2 (psi) at 20.0°C? Assume that...
- Q The most important commercial process for generating hydrogengas is the water-gas shift reaction: CH4(g) + H2O(g) ? CO(g) +3H2(g)?G° for this reaction at the standard temperature of 25°C is1.423×102 kJ....
- Q when you would want to use collision theory over transitionstate theory and when you would want to use transition state theoryover collision theory. Provide examples for both. Use literaturecitations to...
- Q 5.)Part BCalcium sulfate, CaSO4, has a Ksp value of7.10×10−5 . What happens when calcium and sulfatesolutions are mixed to give 2.00×10−3M Ca2+ and3.00×10−2M SO42−?Calcium sulfate, , has a value of...
- Q Which of the following buffer systems would be the best choiceto create a buffer with pH = 9.00? HF/KF HNO2/KNO2 NH3/NH4ClHClO/KClOFor the best system, calculate the ratio of the masses...
- Q Arsenic is a toxic metal that can be found in the watersupply. Begin a discussion on arsenic in water by answering thefollowing questions: What are the current federal standards forarsenic...
- Q (5)Chloroacetic acid, HC2H2ClO2,has a greater acid strength than acetic acid because theelectronegative chlorine atom pulls electrons away from the O-Hbond and thus weakens it. Calculate the hydronium ion concentrationand the...
- Q Comparison of Fresh and Sour MilkpH of fresh milk:pH of sour milk:Which type of milk has the lower pH?The greater acidity?The greater H+ concentration. What organic (carboxylic) acidproduces the H+...
- Q 1. Write the net ionic equation for the reaction that occurswhen equal volumes of 0.256 Maqueous hypochlorous acid andsodium fluoride are mixed (thereshould be 2 spots before and after arrows)at...
- Q Tetramethylsilane (TMS) is the accepted internal standard forcalibrating chemical shift ppm values for 1H, 13C, and 29Si NMRspectroscopy in organic solvents.In 1H-NMR, the TMS peak is assigned 0 ppm. This...
- Q Element: LEADExpectations include but not limited to physical properties(color, density, refractive index, boiling point, melting point,crystal or amorphous, etc), absorption wavelength, chemicalproperties, density, refractive index (if exist)most commoncompounds it makes,...
Get Answers to Unlimited Questions
Join us to gain access to millions of questions and expert answers. Enjoy exclusive benefits tailored just for you!
Membership Benefits:
- Unlimited Question Access with detailed Answers
- Zin AI - 3 Million Words
- 10 Dall-E 3 Images
- 20 Plot Generations
- Conversation with Dialogue Memory
- No Ads, Ever!
- Access to Our Best AI Platform: Flex AI - Your personal assistant for all your inquiries!