一些化学问题(英文版)1.Ionic compounds have very high melting points.Explain at least two forces that cause this physical characteristic.2.List bonds in order of bond strengtha.Hydrogen bond between H2Ob.Covalent bond between H and O in w
This is due to weak intermolecular interaction forces of the Van der Waal s type, with bonding energy considerably lower than that of covalent or ionic bonds in atomic crystals. Lattice energy is accordingly low in molecular crystals, which means low melting and sublimation temperatures, low ...
three oxygen atoms and one hydroxyl present around silicon atom make up an isolated SiO4tetrahedron as in orthosilicates which make a planar array on the edge of a gibbsite sheet. Because of shorter bond length between silicon-oxygen bonds than aluminum-oxygen bonds sheet change into curve shape...
Examine the following table and identify which of the substances A to C are ionic, which are polar covalent, and which are non-polar covalent. Give a reason for your choice in each case. What types of atoms are involved in ionic bon...
Int. Journal of Renewable Energy Development, 3(2), 133-143 doi: 10.14710/ijred.3.2.133-143 P a g e | 138 The valance vibration of hydrogen bonding of OH group of cellulose I is the sum of three different hydrogen bonds: intramolecular hydrogen bond of 2-OH...O-6, intramolecular ...
Column IColumn II(A)Ionic hydrides(p)B2H6,CH4,H2O,SiH4(B)Covalent hydrides(q)CuH,ZnH2,CdH2,HgH2(C)Metallic hydrides(r)ScH2,TiH2,VH2,ZrH2(D)Intermediate hydrides(s)NaH,KH,CaH2,SrH2 View Solution Match the complexes in Column-I with characteristic(s)/ type of hybridisation listed in ...
2), which serve as suitable sites for anchoring Mo5+/6+ or W5+/6+ with an ionic radius of ∼0.6 Å19. We successfully anchored single Mo ions on the Fe2O3(001) surfaces to get a single-atom Mo1/Fe2O3 catalyst (Fig. 1). The highly dispersed Mo ions are evidenced by ...
What is an ionic bond? What type of substance form ionic bond?What types of atoms typically form ionic bonds?Which electronic configuration has a lower energy; Ar3d4 4s2 or Ar3d5 4s1? Identify this element and discuss Hund's rule in ...
Anions Halides (X-): Add dilute nitric acid followed by silver nitrate: White ppt chloride (Cl-) Cream ppt bromide (Br-) Yellow ppt iodide (I-) Ag+ (aq) + Cl- (aq) AgCl (s) Can be followed up by testing solubility of silver halide in ammonia: AgCl: soluble in dilute and...
Because the ionization of an imidazolyl group, whose pKa is 6, on the L-histidine-attached poly(ethylenimine) is influenced significantly by pH near its pKa, such situation might affect density of networks formed by the ionic bonds in the polyelectrolyte complex membrane and resulted in the ...