Chemistry question and answers for July 24, 2023
- Q Show by calculations whether MnS (Ksp = 5.6 ✕10-16) will precipitate when a 0.01 M solution ofMn+2 containing 0.02 M H+1 is saturated withH2S (0.1 M). For H2S,K1xK2 = 6.3...
- Q 1)You are instructed to reflux the reaction for 1 hour. If theinstructions simply told you to reflux until the reaction wascomplete, how would you know when this was?Questions regardingOrganic Chemistry...
- Q Consider formic acid, HCHO2 (Ka = 1.9x10-4) and its conjugatebase, CHO2-.a) A buffer is prepared by dissolving 25.0 grams of sodiumformate in 1.30 L of a solution of 0.660 M...
- Q Consider phosgene, COCl2(g). It is an important intermediate inthe manufacture of some plastics. It can decompose into carbonmonoxide and chlorine gases. Its ΔHf° is -220.1 kJ/mole. a) Writethe balanced chemical...
- Q Explain why the fire service uses an acronym to assist in thedevelopment of the strategies and tactics
- Q Why is AX4 tedreahedral rather than square planar? Use picturesand bond angeles in explanation
- Q List three general uses of gas chromatography in professionalsettings.
- Q Structures of Alkanes:what is the difference between structural (or constitutional)isomers and stereoisomers?How to depict a molecule using wedges and dashes?How to write a condensed formula?How to draw isomers?Explain predicting melting...
- Q 1. The general formula of alkanes is: (i) CnH2n+2 (ii) CnH2n-2(iii) CnH2n (iv) CnH2n+4 (v) Cn+2H2n2. The name of the following compound is: a. Tetrabenzene b.Chrysene c. Coronene d. Anthracene...
- Q a reaction is second order and found to be 75%complete after 15 seconds. find the half-life of the reactionplease show work, thank you!
- Q acid-catalyzed ester hydrolysis yields the organic acid whereasbase-mediated ester hydrolysis yields corresponding salt of theorganic acid. explain
- Q How many grams of dry NH4Cl need to be added to 2.10 L of a0.400 M solution of ammonia, NH3, to prepare a buffer solution thathas a pH of 8.58?...
- Q What are ways you can determine the amount of a substance thatis unknown? Concentration, depth, volume and density? Just formulaslike M= D/V ect... Please give an example and explain for...
- Q Calculate the concentrations of all species in a 0.600 M Na2SO3(sodium sulfite) solution. The ionization constants for sulfurousacid are Ka1 = 1.4× 10–2 and Ka2 = 6.3× 10–8.[HSO3^-]=?[H2SO3]=?[OH^-]=?[H^+]
- Q Q1: List three variables you could change to improve theeffectiveness of the fractional distillation to separating theethanol from water?Q2: Why is 200 proof ethanol not food grade while 190 proof...
- Q Phosphorus exists as several allotropes that have varyingproperties. The enthalpy of transition from white P to red P,ΔtransH, is -18 kJ/mol. The densities of white and red phosphorusare 1.823 and...
- Q which of the following atoms has the largestionization energy? O, Li, N, Be or K
- Q Find the pH during the titration of 20.00 mL of 0.1590 M nitrousacid, HNO2 (Ka = 7.1 ✕ 10-4), with 0.1590 M NaOH solution after thefollowing additions of titrant. (a)...
- Q Do the following problem by hand using TI30Xa calculator. Do theproblem on a fresh sheet of paper (college ruled, printer paper orengineering paper). Find the decrease in pressure expected in...
- Q Make a flow chart for the synthesis of Benzoic Acid from phenylmagnesium bromide and carbon dioxide. Using your knowledge of thephysical properties of the solvents, reactants, and products, showhow the...
- Q A 100.0-mL sample of 0.2 M (CH3)3N (Kb = 5.28 × 10–5) istitrated with 0.2 M HCl. What is the pH at the equivalencepoint?
- Q The leaves of the rhubarb plant contain high concentration ofdiprotic oxalic acid (HOOCCOOH) and must be removed before thestems are used to make the rhubarb pie. If pKa1=1.23 and pKa2=4.19,what...
- Q What is the pH at the equivalence point of the titration of astrong acid with a strong base?
- Q Calculate the vibrational energy difference, in cm-1, betweenthe v=0 and v=1 energy level in a hydrogen chloride-35 molecule.Isotope masses to three decimal places are taken from NIST andforce constants from...
- Q Two structures of alanine can be drawn that have a net charge ofzero, but the predominant form of alanine at its pI iszwitterionic. Why is alanine predominantly zwitterionic rather thancompletely...
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!