Question

b) CI d) He 2. Predict which of the following compounds are ionic and which are covalent, based on the location of their constituent atoms in the periodic table: (a) C1,CO (b) Mno (c) NCI, (d) CoBr (e) CaF (2) HI 3. Identify the more polar bond in each of the following pairs of bonds: (a) HF or HCI (b) NO or CO (C) SH or OH (d) PCI or SCI (e) CH or NH (1) SO or PO What will be the geometry about each central atom in the following molecules? Draw a sketch of the molecule. The skeletal structure for each molecule is listed in parentheses. a) C.H.(HCCH) b) N.H. (H,NNH) c) CH-NH,(H,CNH) d) CF,COOH (both O atoms are attached to the second C, H atom is attached to 0) 5. Write resonance forms that describe the distribution of electrons in each of these molecules or ions. (a) selenium dioxide, OSCO

Answer 1

2.

Ionic compounds are formed between Metals and nonmetals.

Ca , Co and Mn are metals .

Cl , C , O , N , H and I are nonmetals.

Hence, Ionic compounds are CaF₂ , CoBr₂, MnO.

Covalent compounds are Cl₂CO, NCl₃, HI.

3.

Polarity increases with difference in electronegativity between bonding atoms

a)

Fluorine is more electronegative than Chlorine hence HF is more polar HCl.

b)

Nitrogen is more electronegative than Carbon, hence NO is more polar than CO.

C)

Oxygen is more electronegative than Sulfur, hence OH is polar than SH.

d)

Cl is electronegative atom. So less electronegative atom forms more polar bond with Cl.

Electronegativity of Phosphorous is less than Sulfur.

Hence, difference between electronegativity between P and Cl is higher than that of S and Cl.

So, PCl bond is more polar than SCl bond.

e)

Nitrogen is more electronegative than Carbon hence NH bond is more polar than CH.

f)

Oxygen is electronegative. Phosphorous has less electronegativity than sulfur.

So, difference between electronegativity between S and O is less than P and O.

Hence, PO bond is more polar.

4.

a) H? - EC-H Linear :z ~ I - H 'N H pyramidal I

0 = ul NH2 are c-OH Tetrahedral Tetrahedral

5.

70 : : 0