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- What is the VSEPR geometrical shape of the silicate ion, SiO32- ?What mass of silver oxide, Ag2I, is required to produce 25g of silver sulfadiazine, AgC10H9N4SO2, from the reaction of silver oxide snd sulfadiazine?Nitrogen is found in nature as N2(g). Would you expect phosphorus to be found innature as P2(g)? Explain.
- (a) (i) (ii) (iii) With the aid of a simple schematic, explain what covalent bonding is and how it is formed. What are the differences between a covalent bond and an ionic bond? Which type of bond is found in crystalline silicon? At room temperature do you expect an ionic crystal to be a good electrical conductor or a good electrical insulator? Explain why.a Spinels are solids with the general formula M²+ (M¹³+)₂ 04 (where M²+ and M¹³ are 3+ 3+ metal cations of the same or different metals). The best-known example is common magnetite, Fe3O4 [which you can formulate as (Fe³+)₂04]. (Fe²+) A crystal of a spinel Given its name, it is evident that magnetite is ferromagnetic. How many unpaired electrons are there in iron (II) and in iron(III) ions? Iron(II) ion: unpaired electron(s) Iron(III) ion: unpaired electron(s)Define the term empiricalchemical formula What is the shape of the SiO4 unit in complicated silicate anions?
- Predict the structure and label the charges on the cations in the mineral hedenbergite, CaFeSi2O6The pentafluorides of the larger members of Group 5A(15)have been prepared, but N can have only eight electrons. A claim has been made that, at low temperatures, a compound with the empirical formula NF₅ forms. Draw a possible Lewis structure for this compound.Draw a Lewis electron-dot diagram for the disilicate ion (Si2O9 ). What changes in this structure would be neces- sary to produce the structure of the pyrophosphate ion (P2O¯) and the pyrosulfate ion (S2O?¯)? What is the analogous compound of chlorine?
- The melting points of the alkali metals decrease from Li to Cs. In contrast, the melting points of the halogens increase from F2 to I2. (a) Using bonding principles, account for the decrease in the melting points of the alkali metals. (b) Using bonding principles, account for the decrease in the melting points of the halogens. (c) What is the expected trend in the melting points of the compounds LiF, NaCl, KBr, and CsI? Explain this trend using bonding principles. Note: Please briefly explain all the questions listed above. Thank you.Of the elements Be, C, Cl, Sb, and Cs, which (a) has the lowestelectronegativity, (b) has the greatest nonmetallic character,(c) is most likely to participate in extensive π bonding,(d) is most likely to be a metalloid?Calculate the standard enthalpy of formation of the M20(s) metal oxide (AH in kJ/mol) using the following data: Bond dissociation enthalpy of O2(g) = +498 kJ/mol First electron affinity of O = -141 kJ/mol Second electron affinity of O = +744 kJ/mol Enthalpy of sublimation of M = + 124 kJ/mol First ionization energy of M = + 372 kJ/mol Lattice enthalpy of M20(s) = -2115 kJ/mol Refer to the textbook for definitions of ionization energy and electron affinity. Do not use scientific notation for your answer. Do not enter units. Your Answer: Answer
