Chemistry question and answers for August 22, 2023
- Q This is a Physical Chemistry Problem: For a particle in a cubicbox of length a, how many states have energy in the range of 0 to16(h2/8ma2)?
- Q What are the Ksp values for below 2.0×10−3 M AgNO3;RbCl 8.5×10−2M CaI2;K2SO4
- Q A student measured the optical activity of an unknown sugar attwo different concentrations. The results of his measurements areshown below. Given that the sample cell had a path length of...
- Q A photocell, such as that illustrated in Figure 6.7(b), is adevice used to measure the intensity of light. In a certainexperiment, when light of wavelength 560 nm is directed on...
- Q Calculate the percent composition and determine the molecularformula and the empirical formula for the nitrogen-oxygen compoundthat results when 12.04 g of nitrogen is reacted with enough oxygento produce 39.54 g...
- Q What are some possible errors which affect %yield in the columnchromatography experiment? (No TLC)
- Q An element crystallizes in a body-centered cubic lattice. Theedge of the unit cell is 3.28 Ã… in length, and the density of thecrystal is 6.50 g/cm3 .a.) Calculate the atomic...
- Q . A water solution has 1.00x10-2 moles of H+ in 10.00 liters A.What is the [H+] in the solution? B. What is the pH ? C. What isthe [OH-] ions?...
- Q The combustion of liquid ethanol (c2H5OH) produces CarbonDioxide and water. After 4.62 mL of ethanol ( density= 0.789 g/mL)was allowed to burn in the presence of 15.55 g of Oxygen...
- Q You have 1 M solutions of H3PO4,NaH2PO4, Na2HPO4,Na3PO4 (no NaOH).=> Using only two of these solutions, how would youprepare 150 mL of 1 M phosphate buffer at pH 3.0?A)131.4 mL...
- Q using three enzymatic steps propose a pathway for the conversionof alpha ketoglutartate to 2-oxoadipate. Draw the missingintermediates and indicate the chemistry involved in each reaction.Include any cofactors that might be...
- Q An acidic buffer solution can be prepared from phosphoric acidand dihydrogen phosphate.a. What is the pH of solution prepared by mixing 23.5g of NaH 2PO 4 and 15.0mL of concentrated...
- Q 12.You have a mixture of solids in the ratio of 50:3 forA : B. You are planning to use the technique ofrecrystallization to purify A and realize that youwill first...
- Q 10.4g of Mercury(2) oxide will produce what volume of oxygen inthe reaction where mercury(1) oxide and oxygen produces mercury(2)oxide
- Q Heavy metal azides, which are salts of hydrazoic acid, HN3, areused as explosive detonators. A solution of 0.20M hydrazoic acidhas a pH of 3.21. What is the Ka for hydrazoic...
- Q Pressurized tanks are commonly used in gas propulsion for spaceapplications. Two rigid, insulated tanks are interconnected by avalve. Initially 0.79 kmol of nitrogen at 200 kPa and -18oC fillsone tank....
- Q 1) Zinc reacts with hydrochloric acid according to the reactionequation.How many milliliters of 4.00 M HCl(aq) are required toreact with 5.85 g of an ore containing 44.0% Zn(s) by mass?2)...
- Q Balance each of the following reations using the half reactionmethod. Show all worka. Bi(OH)3(S) + Sn(OH)3-(aq)---> Sn(OH)62- (aq) + Bi(s) (Basicsolution)b. BrO3-(aq) + Sb3+(aq) --->Br - (aq) + Sb5+ (aq)...
- Q Given that ΔG∘ = −13.6 kJ/mol, calculate ΔG at 25∘C for thefollowing sets of conditions.1) 30 atm NH3, 30 atm CO2, 4.0 M NH2CONH2 Express the freeenergy in kilojoules per...
- Q You find two bottles of white solid on a shelf in the stock roomwithout labels. You then find two labels CaCl2 (s) and KCl (s0lyring right beside. You want to...
- Q if youre doing an analysis with a tlc plate and you use ethylactete (polar) as the solvent please rank the distance that thesemolecules would move (aka which one would be...
- Q what new facts you discover about the nature of matterand/or what surprise you in the experiment called the molecularmodels: lewis dot formula, VSEPR theory, and valence bondtheory
- Q a)How many mol are in 64.61 g of nickel(II) phosphite?b)How many mol of carbon are in 30.6 g of aluminumcarbonate?c)What is the mass (in grams) of 1.01 mol of iron(III)chloride?d)What...
- Q What are the 4 major macromolecules and how to they supportlife.Be sure to check your spelling. Minimum response should be 10sentences.
- Q For the production of ammonia from its elements,3H2(g)+N2(g)→2NH3(g),ΔH = -21.9 kcal.Part A: Is thisprocess endothermic or exothermic?   Part B: How many kilocalories are involved inthe production of 27.75 g of...
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