Samacheer Kalvi solutions for Science [English] Class 9 TN Board chapter 13 - Chemical Bonding [Latest edition]

Number of valence electrons in carbon is ______.

Sodium having atomic number 11, is ready to ______ electron/ electrons to attain the nearest noble gas electronic configuration.

The element that would form anion by gaining electrons in a chemical reaction is ______.

Bond formed between a metal and non metal atom is usually ______.

______ compounds have high melting and boiling points.

Covalent bond is formed by ______

Oxidising agents are also called as ______ because they remove electrons form other substances.

Elements with stable electronic configurations have eight electrons in their valence shell. They are ______.

How do atoms attain Noble gas electronic configuration?

NaCl is insoluble in carbon tetrachloride but soluble in water. Give reason.

Explain Octet rule with an example.

Write a note on different types on bonds.

Correct the wrong statements.

1. Ionic compounds dissolve in non polar solvents.
2. Covalent compounds conduct electricity in molten or solution state.

Complete the table give below.

Draw the electron distribution diagram for the formation of Carbon di oxide (CO2 ) molecule.

Fill in the following table according to the type of bonds formed in the given molecule.

CaCl₂, H₂O, CaO, CO, KBr, HCl, CCl₄, HF, CO₂, Al₂Cl₆

The property which is characteristics of an Ionic compound is that______ 

Identify the following reactions as oxidation or reduction

1. Na → Na+ + e
2. Fe3+ + 2 e- → Fe+

Identify the compounds as Ionic/ Covalent/Coordinate based on the given characteristics.

1. Soluble in non polar solvents
2. Undergoes faster/instantaneous reactions
3. Non conductors of electricity
4. Solids at room temperature

An atom X with atomic number 20 combines with atom Y with atomic number 8. Draw the dot structure for the formation of the molecule XY.

Considering MgCl₂ as ionic compound and CH₄ as covalent compound give any two differences between these two compounds.

Why are Noble gases inert in nature?

List two differences between the properties exhibited by covalent compounds and ionic compounds.

Give an example for each of the following statement

A compound in which two Covalent bonds are formed. 

Give an example for each of the following statement.

A compound in which one ionic bond is formed.

Give an example for each of the following statement.

Formation of coordinate covalent bond between NH₃ ➝ BF₃ molecules

Give an example for each of the following statement.

A compound in which three covalent bonds are formed.

Give an example for each of the following statement.

A compound in which coordinate bond is formed.

Identify the incorrect statement and correct them.

1. Like covalent compounds, coordinate compounds also contain charged particles (ions). So they are good conductors of electricity. 
2. Ionic bond is a weak bond when compared to Hydrogen bond.
3. Ionic or electrovalent bonds are formed by mutual sharing of electrons between atoms. 
4. Loss of electrons is called Oxidation and gain of electron is called Reduction.
5. The electrons which are not involved in bonding are called valence electrons.

Discuss in brief about the properties of coordinate covalent compounds.

Find the oxidation number of the elements in the following compounds. 

1. C in CO2
2. Mn in MnSO4
3. N in HNO3