CHEMICAL BONDING-ICSE BOARD PRESENTATION

CHEMICAL BONDING CLASS 11TH

1. CHEMICAL BONDING

2. ELECTROVALENT OR IONIC BOND

3. CONDITIONS FOR THE FORMATION OF IONIC BOND

4. STRUCTURE OF SOME IONIC COMPOUNDS

5. PRACTICE QUESTIONS

6. COVALENT (MOLECULAR) BOND

7. Question 1 State which is not a common characteristic of an electrovalent compound? (1) High melting point. Conducts electricity when molten. Consists of oppositely charged ions. Ionizes when dissolved in water. Q2.State why CCl 4  is a non-electrolyte. (1) Q3. State the terms defined in each case: (2) A bond formed by – (a) a shared pair of electrons, each bonding atom contributing one electron to the pair. (b) a shared pair of electrons with both electrons coming from the same atom. Q4. The one which is composed of all the three kinds of bond [ionic, covalent and coordinate bond] is: (1) Sodium chloride Ammonia Carbon tetrachloride Ammonium chloride TEST-20 MARKS

8. Q5.Draw the structural formula of carbon tetrachloride and state the type of bond present in it. (2) Q6. Select the correct answer from A, B, C and D — Metals lose electrons during ionization — this change is called: (1) Oxidation Reduction Redox Displacement Q7. Select the right answer from the choices — covalent bond / ionic bond / covalent & coordinate bond for each of the following — (1) ( i ) Sodium chloride (ii) Ammonium ion (iii) Carbon tetrachloride Q8.( i ) In covalent compounds, the bond is formed due to ............... [sharing/transfer] of electrons. (ii) Electrovalent compounds have a ............... [low/high] boiling point. (iii) A molecule of ............... contains a triple bond, [hydrogen, ammonia, nitrogen] (3) Q9. Give reasons — (2) Hydrogen chloride can be termed as a polar covalent compound.

9. Q10.There are three elements E, F, G with atomic numbers 19, 8 and 17 respectively. Give the molecular formula of the compound formed between E and G and state the type of chemical bond in this compound. (1) Q11.A chemical term for: A bond formed by a shared pair of electrons with both electrons coming from the same atom. (1) Q12. Elements — W, X, Y & Z have electronic configurations: (4) W = 2,8,1 X = 2,8,7 Y = 2,5 Z = 1 ( i ) What type of bond is formed between:     (a) W and X     (b) Y and Z (ii) What is the formula of the compound formed between :     (a) X and Z     (b) W and X