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- A chemist, during the course of an analysis, runs across a chemical composed of carbon, hydrogen, and oxygen in the proportion 1:2:1 and having a six-sided molecular shape. It is probably (a) a pentose, (b) an amino acid, (c) a fatty acid, (d) a monosaccharide, (e) a nucleic acid.What is the chemical formula for chromium(III) oxalate? Do not use any spaces (e.g., Ca3(PO4)2 would be written as Ca3(PO4)2 with no spaces).6. What are the correct subscripts for Fe and Al in the following pyroxene formula- Highlight and replace the question marks (?) with your answers. Ca, Na(1-xMg,Fe Al Siz06 7. Calculate the proportions of jadeite (NaAlsi,O6), diopside (CaMgsi,06) and hedenbergite (CaFesi,06) in this pyroxene with x = 0.9 and y = 0.8. x. Highlight and replace the question mark (?) with your answers. Jadeite (NaALSi,O6) ? Diopside (CaMgSi,06) Hedenbergite (CaFeSi206) ?
- Which of the following sets contains an ionic compound, a molecular compound, and an acid, in that order? (A) Al2O3, B2O3, CH3OH; (B) CaCl2, NH4Cl, HCl; (C) CH3F, COCl2, HOCl; (D) CoCl2, COCl2, HClO2.What would be the observation following mixing BaCl2 and Pb(NO3)2?Name the compounds (a) SO2, (b) PCl5, (c) Cl2O3.
- Many chemical names are similar at first glance. Give the for-mulas of the species in each set: (a) ammonium ion and ammo-nia; (b) magnesium sulfide, magnesium sulfite, and magnesiumsulfate; (c) hydrochloric acid, chloric acid, and chlorous acid; (d) cuprous bromide and cupric bromideGive a reason why each of the following statements is a safeprediction:(a) Every compound of Rb with a nonmetal is ionic in character.(b) Every compound of nitrogen with a halogen element is amolecular compound.(c) The compound MgKr2 does not exist.(d) Na and K are very similar in the compounds they form withnonmetals.(e) If contained in an ionic compound, calcium (Ca) will be inthe form of the doubly charged ion, Ca24. The common oxidation number for an alkaline earth metal is +2. (a) Using the Born-Mayer equation (for determining the lattice enthalpy) and a Born-Haber cycle (draw it), show that CaCl is an exothermic compound (negative AHf). Make a reasonable prediction to estimate the ionic radius of Ca (explain your reasoning). The sublimation (atomization) enthalpy for Ca(s) is 178 kJ/mol. (b) Show that an explanation for the non-existence of CaCl can be found in the enthalpy change for the reaction below. The AHf for CaCl2(s) is -190.2 kcal/mol. 2 CaCl(s) → Ca(s) + CaCl2(s)
- Testosterone is an anabolic steroid. The structure of testosterone is shown below. What is the idealised bond angle at the indicated atom (ii) ? Hint: atom (iv) has been completed for you as an example. (iv) bond angle: 109.5°, geometry of the electron pairs: tetrahedral, shape of the bonds: tetrahedral ·····|||I H ····||||I ii ivNitrogen is found in nature as N2(g). Would you expect phosphorus to be found innature as P2(g)? Explain.Two questions only try to give short answers no need to explain in detail thx It chemistry grade 12 college 1. A type of clay is found to be 48% silica. A field sample of this clay is 15% water. What is the mass percent of silica in a dry sample of this clay? 2. Arrange the following ions in order of decreasing size: Bri, Al3+, Nalt, Mg2+, Il-.