Tutorial chemistry 4A PDF

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CHM 131 - SEM 1...

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CHM131 GENERAL CHEMISTRY TUTORIAL 4a: CHEMICAL BONDING 1.

a.

Explain the meaning of i. covalent bond ii. ionic bond Answers: i. Covalent bond is a chemical bond in which two or more electrons are shared by two atoms. ii. Ionic bond is a type of chemical bonding that involves the electrostatic force that holds ions together in an ionic compound.

b.

State 2 properties of each type of chemical bonding. Answers: Properties Shape Melting & boiling points

2.

Ionic compounds Exist as solid in room temperature High

Covalent compounds May exist as solids, liquid or gases Low

Show the formation of the following ionic/covalent compound. a. Calcium fluoride, CaF 2 b. H 2O Answers: a.

b.

3. Both phosphorus (P) and nitrogen (N) are placed in group 15 of the periodic table. Draw the Lewis structure of PCl5 and NCl3. Answers: PCl 5 =

NCl 3 =

4. Classify each of the following compounds as ionic or covalent: a. MgCl 2 b. CO 2 c. H2 S d. NO 2 Answers: a. Ionic b. Covalent c. Covalent d. Covalent 5. For NH3 a) Draw the Lewis structure b) Indicate the number of nonbonding pairs (unshared electrons) of electrons Answers: a.

b.

= 8 – (3x2) = 2 non bonding e

6. Write the Lewis structures for a. CNb. SeF 4 c. BrF5 Answers: a.

b.

c....