A. boron B. carbon (diamond) C. silicon D. sulphur 6. Which of the following chlorides is most likely to be soluble in tetrachloromethane, CCl4? A. barium chloride B. caesium chloride C. calcium chloride D. phosphorus chloride 7. In which of the following liquids does hydrogen bonding occur? A. ethanoic acid B. ethyl ethanoate C. hexane D. hex-1-ene 8.
| C) | BH3 is trigonal planar and NH3 is trigonal pyramidal. | D) | BH3 is trigonal pyramidal and NH3 is trigonal planar. | 4. | Which one of the following is the conjugate acid of ethanol? | A) | CH3CH2O– | B) | CH3CH2O+ | C) | CH3CH2OH2+ | D) | CH3CH2OH3+ | 5.
Explain why one is essentially the same as the other. (2) 8. Determine the conjugate acid-base pairs in the following reactions: (Use 2 lines to connect the 2 pairs in each reaction.) (3) a. NH3(aq) + H2O(l) ↔ NH4+(aq) + OH-(aq) (base)NH3 and (acid)NH4+ OH- and H2O b. HNO2(aq) + H2O(l) ↔ H3O+(aq) + NO2-(aq) H2O and H3O+ NO2 and HNO2 c. HCN(aq) + H2O(l) ↔ H3O+(aq) + CN-(aq) CN and HCN H2O and H3O+ 9. How is the formula of a conjugate acid similar to its conjugate base, and how is it different?
A) S B) Cl C) S2O32- D) ClO- 32. What is the oxidation number of Cl in ClO-? A) +1 B) +4 C) +2 D) -1 E) 0 33. What is the oxidation number of S in SO42-? A) +12 B) +4 C) +6 D) -2 E) 0 34.
5 12WAB10835 Dioxane; 7 123-91-1 GC/FID; CSC 5 12WAB09523 Diphenylamine; 22; Fully Validated 122-39-4 HPLC/UV; Bubbler with Isopropyl Alcohol 5 12WAB10906 Diphenylamine; 78; Fully Validated 122-39-4 HPLC/UV; GFF coated with Sulfuric Acid 5 12WAB10073 Diphenyl; PV2022; Partially Validated 92-52-4 GC/FID; XAD-7 5 12WAB10850 Dipropyl Disulfide; PV2086; Partially Validated 629-19-6 GC/FID; Chromosorb 106 5 12WAB10450 Dipropylene Glycol Methyl Ether; 101; Fully Validated 34590-94-8 GC/FID; CSC 5 12WAB10905 Disulfoton; PV2105; Partially Validated 298-04-4 GC/FPD; OVS-2 5 12WAB11596 Diuron; PV2097; Partially Validated 330-54-1 HPLC/UV; OVS-2 5 12WAR11371 Divinylbenzene; 89; Fully Validated 108-57-6 GC/FID; CSC coated with TBC 5 12WAB10451 Dursban; 62; Fully Validated 2921-88-2 GC/FPD; OVS-2 5 12WAB10449 Endosulfan; PV2023; Partially Validated 115-29-7 GC/ECD; OVS-2 5 12WABI0801 Enflurane; 29; Fully Validated 13838-16-9 GC/FID; CSC 5 12WAB10448 Enflurane; 103; Fully Validated 13838-16-9 GC/FID; Anasorb CMS or Anasorb 747 5 12WAB09860 Epichlorohydrin; 7 106-89-8 GC/FID; CSC 5 12WAB09198 Estradiol; PV2001; Partially Validated 50-28-2 HPLC/UV; GFF 5 12WAB10447 Estriol; PV2001; Partially Validated 50-27-1 HPLC/UV;
Water (H2O) is colorless liquid that’s the basis of life on Earth. It contains two hydrogen bonds and is a polar molecule; it has a dipole moment of 1.85D[2]. Volume percent is a method used when preparing solution of liquids. It is defined as Concentration solute (v/v%) = [(volume of solute)/(volume of solution)] x 100% [5] This experiment is to use volume percent to create different concentration of 3M nitric acid solutions and investigate the effect of different concentration, which creates different strength of intermolecular forces, on the volume of a drop of nitric acid. Research question: What is the effect of different concentration of nitric acid on its volume of its drop?
Where it resulted to values of 3.990602 x 10-3 s-1, 4.653278 x 10-3 s-1, 5.944044 x 10-3 s-1, 7.499958 x 10-3 s-1, 7.499958 x 10-3 s-1, 9.84554 x 10-3 s-1, for flasks 4, 5, 6, 7, 8. Then the Ionic strength was calculated using the equation µ=½∑ ci zi2 . Which resulted in 4.5392142 x 10-2, 6.4999998 x 10-2, 1.23823528 x 10-1, 2.21862742 x 10-1, and 4.17941175 x 10-1. It
The vanadyl group is bonded to 2 acetylacetonate anions and the structure of the compound is as follow:This complex can be made from vanadium(IV) or vanadium(V). In our experiment, bis(acetylacetonato)oxovanadium(IV) was prepared from vanadium(V) oxide and the equation is as follow:V2O5 + 2H2SO4 + EtOH 2VOSO4 + 3H2O + CH3CHO VOSO4 + 2HC5H7O2 + Na2CO3 VO(C5H7O2)2 + Na2So4 + H2O + CO2 (Absolute Astronomy, 2009) Besides that, both of the acetylacetonato (acac) groups of
Number of moles of CuCl2 used = [pic] =[pic] = 0.127 moles Therefore, Molarity of CuCl2 = [pic] = [pic] = 0.063 mol/dm3 Number of moles of ethylenediamine used = [pic] =[pic] = [pic] = 0.1 mole Therefore, Molarity of ethylenediamine = [pic] = [pic] = 0.05 mol/dm3 2. Plot a graph of absorbance versus mole fraction of ligand. 3. From the graph, look for the maxima and from the corresponding mole fraction, determine the formula of the complex. Maximum absorbance occur when mole fraction of ligand is 0.65.
(3 marks) (ii) What is the chromatographic mechanism involved? Describe how the mechanism effects separation to the three compounds. (8 marks) (iii) With explanation, describe what would happen to the peaks in the chromatogram when the packing silica with a larger pore size and smaller surface area is used in the above separation. (6 marks) 2. A mixture of Br-, Cl- and PO43- ions was subjected to an anionic column packed with polym-N(CH3)3+OH-, eluted with 9mM sodium carbonate.