You have ZrO2-Nb2O5 composite and HfO2-Ta2O5 composite. Can you distinguish the oxide phases in the composites using SEM imaging? How do you identify different oxide phases?
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You have ZrO2-Nb2O5 composite and HfO2-Ta2O5 composite. Can you distinguish the oxide phases in the composites using SEM imaging? How do you identify different oxide phases?
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- K2Cr2O7 + 7H2C2O4·2H2O → 2K(Cr(C2O4)2(H2O)2) + 6CO2 + 17H2O Calculate theoretical yield of: K[Cr(C204)2(H20)2] · 2H2O (3 g of oxalic acid dihydrate (H2C2O4·2H2O) )(1 g of potassium dichromate (K2Cr2O7) )(20 mL of 95% ethanol)To determine the amount of magnetite. Fe3O4, in an impure ore, a 1.5419 g sample is dissolved in concentrated HCl, resulting in a mixture of Fe2+ and Fe3+. After adding HNO3 to oxidize Fe2+ to Fe3+ and diluting with water, Fe3+ is precipitated as Fe(OH)3 using NH3. Filtering, rinsing and igniting the ppt provides 0.8525 g of pure Fe2O3. Calculate % Fe in the sample.how does the composition and structure of metal alloys, polymers and polymer matrix composites influence the properties of the parent material.
- A chemist obtained the following data for the percent compound Z in triplicates (n=3) of an insecticide preparation: 7.47, 6.98, and 7.27. Calculate the 90% confidence limit for the mean of the data assuming that only information about the precision of the method is the precision for the three data points. 7.24 ± 0.74% 7.24 ± 0.13% 7.24 ± 0.42% 7.24 ± 0.27%The synthesis of spinel Mg, TiO can 2 4 be achieved by heating TiO with 2 MgO at 1400 °C over a period of several days. How would powder XRD be able to demonstrate that the reaction had gone to completion?6. Most minerals can be considered to be salts of weak acids and strong bases. Identify the weak-acid and strong-base components in each of the following minerals: a. Olivine [Mg2SiO4] b. K-feldspar [KAISI3Og] c. Diopside (CaMgSi,O) d. Kaolinite [Al₂Si₂O5(OH)4] olling
- Part B. Consider the reaction of K-feldspar (KAISI308) to create kaolinite (Al2Si2O3(OH)4) 2KAISI308 + 2H+ + 9H₂O Al2Si2O5(OH)4 + 2K+ +4H4SiO4º AGR° = 37.66 kJ/mol 2. Calculate the K for this reaction from the AGR°. Do this calculation by hand.How does 14Si have the same valence of 126C ?Why is iron generally harder and have higher yield strength (σy) when it is alloyed with carbon? a) Carbon forms an interstitial solid solution in iron and Fe-C bonds are very strong. b) Carbon forms an interstitial solid solution in iron and the C atoms bind dislocations. c) Carbon forms a substitutional solid solution in iron and Fe-C bonds are very strong. d) Carbon forms a substitutional solid solution in iron and the C atoms bind dislocations. e) Carbon is the base element for diamond, which is very hard.
- 210 250 R Which of the following descriptions correctly describes the silicate glass in the bulb of a pH electrode? a) The silicate glass in the glass membrane has an irregular, amorphous structure. b) The silicate glass in the membrane is highly organized into repeating rings of SiO4 units. c) The glass membrane is highly ordered crystalline silicate glass. d) The hydrated gel regions of the glass are amorphous, whereas the dry glass layer is crystalline If a pH meter obeying the relationship of "E = constant + 0.0592/n* (log A)" in its calibration range, by what factor does the activity of H+ change if the potential difference is 177.5 mV? b) 1000 a) 3 c) 100 d) 0.001The reaction of divalent manganese with oxygen in aqueous solution is given as follows: Mn2+ + 1/2O2(aq) + H2O = MnO2(s) + 2H+ The equilibrium constant (K) for this reaction is 23.7. It has been found that a lake water sample that contains no oxygen at 25 C, pH = 8.5, originally contained 0.6 mg/L of Mn2+. The sample was aerated (atmospheric conditions of the dissolved oxyen concentration is 9.2 mg/L) and after 10 days of contact with atmospheric oxygen, the Mn2+ concentration was 0.4 mg/L. The molecular weight of Mn is 55, O is 16 and H is 1. The change in free energy of formation at standard conditions (kcal/mole) are as follows: Mn2+ = -54.4, O2(aq) = +3.93, H2O = -56.69, MnO2(s) = -111.1, H+ = 0. (a) Assuming that the pH remains constant during aeration, will the precipitate continue to form after the measurement on the tenth day? (b) What should the Mn2+ concentration be (in moles/L) at equilibrium, assuming that pH and presence of dissolved oxygen are the same as in part "a".…1. Complete and/or balance the following chemical weathering or redox reactions (show all steps): a. Al2Si2O5(OH)4 (kaolinite) + H₂O Al(OH)3 (gibbsite) + H4SiO4° b. CaAl2Si208 (anorthite)→→ Al2Si2O5(OH)4 (kaolinite) c. Pyrite oxidation: FeS2 + O2 → Fe²+ + SO4²- d. Methane oxidation: CH4 + SO42→ HCO3 + H₂S 20 2. Geochemists are concerned with the chemistry of natural waters because it affects drinking water quality and ecosystem health. A water has the following chemical analysis: Nat K+ Ca2+ Mg2+ Sr²+ Temp 120.0 ppm 15.00 ppm 380.0 ppm 22.00 ppm 0.8000 ppm 25.00°C SO42- CI HCO32- SiO₂ pH 1115 ppm 15.00 ppm 150.0 ppm 21.0 ppm 7.400 What are these concentrations in mmol/kg (use excel)? b. Do the charges balance (total positive charges = total negative charges)? c. Would you want to drink this water? Why or why not?