Chemistry question and answers for August 19, 2023
- Q Use the following information to answer questions 5-10. Astudent determined the heat of neutralization of copper (II)sulfate (CuSO4) mixed with potassium hydroxide (KOH) using theprocedure described part 2 of this...
- Q Enthalpy H is a measure of the energy content of a system atconstant pressure. Chemical reactions involve changes in enthalpy,ΔH, which can be measured and calculated:ΔHrxn∘=∑productsmΔHf∘−∑reactantsnΔHf∘ where the subscript \"rxn\"...
- Q What are the factors influencing the transport and behaviour ofwastes in the environment?
- Q Though they are not necessary in every situation, solvents areused when performing reactions for many reasons. What function doesa solvent serve in a reaction (list two)? What characteristics areimportant to...
- Q Use data in Appendix C in the textbook to calculate ΔH∘ in(kJ/mol) , ΔS∘ in (j/mol-K) , and ΔG∘ in (kJ/mol) at 25 ∘C for eachof the following reactions: 2P(g)+10HF(g)→2PF5(g)+5H2(g)Appendix...
- Q a sample of iron ore (m=0,330g)consisting of a mixture of FeOand Fe2O3 was dissolved in dilute sulfuric acid and titrated with apotassium permanganate solution containing 0.0200g of KMnO4 perlitre, and...
- Q Using (Kf=1.2×109) calculate the concentration of Ni2+(aq),assuming that it is present as Ni(NH3)2+6, at equilibrium afterdissolving 1.28 gNiCl2 in 100.0 mL of 0.20 MNH3(aq).
- Q Which of the following ions or atoms possess paramagneticproperties ?SAr-S2-ArNa+
- Q What is a buffer and how does it work?
- Q Achemist titrates 210.0 mL of a 0.7560 M butanoic acid (HC3H7CO2)solution with 0.6335 M KOH solution at 25 degrees celsius.Calculate the pH at equivalence. The pKa of butanoic acid is...
- Q What difference between NMR and FTIR in chemical structurecharacterization?
- Q Compare and contrast the intravascular and extravascular routesof hemoglobin degradation (identify at least two similarities andat least 3 differences)
- Q It has been argued by those who do not believe in evolution thata cell could not evolve because such an occurrence would go againstthe idea that there is a constant...
- Q I am doing a separation scheme of4-chloro-3,4-dimethylnonane-1-amine and4-hodroxy-3-methoxybenzaldehyde (which I think is vanillin). Ibelieve both are starting as a solid. The first molecule andvanillin should be soluble in diethyl ether,...
- Q A 2.85 g lead weight, initially at 11.0 ∘C, is submerged in 7.43g of water at 52.2 ∘C in an insulated container. You may want toreference ( pages 349 -...
- Q A laser puts out 4.4 W of continuous power at a wavelength of532 nm. The diameter of the laser beam is 5.1 mmIf the laser is pointed toward a pinhole...
- Q What happens to the pressure of a gas when T is halved andvolume is doubled1.It is ¼ of its initial value2.It is 4 times its initial value3.It is ½ of...
- Q Ammonia reacts with oxygen according to the equation:4NH3(g)+5O2(g)→4NO(g)+6H2O(g) ΔHrxn=-906 kJ Part A Calculate theheat (in kJ) associated with the complete reaction of 284 g of NH3.Express your answer with the...
- Q 1) Identify cations by selective precipitation and specificreaction of these mixture:Cu(2+); Bi (3+), Cd (2+), Sb(5+); Sn (2+), Fe(3+), Co(2+),Mg(2+), Li+2) Calculate the solubility of each of the following compoundsin...
- Q A sample containing 4.10 g of O2 gas has an initial volume of21.0 L . What is the final volume, in liters, when each of thefollowing changes occurs in the...
- Q How many of the following responses are true?1. A primary alkyl halide will tend to react through an SN2mechanism because there is little hindrance to backside attack anda primary carbocation...
- Q calculate the freezing point of water (Kf= 1.86 C/m) for anideal solution of sodium phosphate which has a concetration of 3.25m .
- Q Calculate the solubility (in g·L–1) of CuBr(s) (Ksp = 6.3× 10–9)in 0.57 M NH3(aq).
- Q Calculate the pH after adding 10.00 mL of 0.15 M HCl to 50 mL ofthe ammonia/ammonium ion buffer solution with a ph of 4.82
- Q The Hohenberg-Kohn theorems show a one-to-one mapping betweenthe density and the molecular Hamiltonian. What information iscontained in the Hamiltonian and, conceptually, how can thisinformation be extracted from the density?
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