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Class 9 Chemistry Chapter 4 Notes
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9th Class Chemistry Chapter 4 Structure of Molecules Short Questions
- Atoms of different elements react to attain a noble gas configuration, which is stable.
- Chemical bonds may be formed by complete transfer of electrons (ionic); mutual sharing (covalent) or by donation from an atom(coordinate or dative covalent).
- Metals have the tendency to lose electrons easily forming cations.
- Non-metals have a tendency to gain electrons and form anions.
- In ionic bonding, a strong electrostatic force holds ions together.
- Ionic compounds are solids with high melting and boiling points.
- Covalent bonds among non-metals are weaker than ionic bonds.
- Ionic bonds are non-directional, but covalent bonds are formed in a particular direction.
- Covalent bonds formed between similar atoms are non-polar while between different atoms are polar.
- In covalent bonding single, double, or triple covalent bond is formed by sharing of one, two, or three electron pairs by the bonded atoms.
- A coordinate covalent bond is formed between electron pair donors and electron pair acceptors.
- The metallic bond is formed between metal atoms due to free electrons.
- In addition to chemical bonds, intermolecular forces of attraction exist between polar molecules.
- Hydrogen bonding exists between the hydrogen atom of one molecule and the highly electronegative atom of another molecule.
- Hydrogen bonds affect the physical properties of the compounds.
- The properties of the compounds depend upon the nature of bonding present in the compound.
- Ionic compounds are crystalline solids with high melting and boiling points.
- Covalent compounds exist in molecular form in three physical states.
- Polar and non-polar covalent compounds have different properties.
- Metals have shining surfaces. They are good conductors of electricity and are malleable and ductile.
- Why do atoms react?
- Why is the bond between an electropositive and an electronegative atom ionic in nature?
- Ionic compounds are solids. Justify.
- More electronegative elements can form bonds between themselves. Justify.
- Metals are good conductors of electricity. Why?
- Ionic compounds conduct electricity in solution or molten form. Why?
- What type of covalent bond is formed in nitrogen molecules?
- Differentiate between lone pair and bond pair of electrons.
- Describe at least two necessary conditions for the formation of a covalent bond.
- Why HC1 has dipole-dipole forces of attraction?
- What is a triple covalent bond, explain with an example.
- What is the difference between polar and non-polar covalent bonds, explain with one example of each.
- Why does a covalent bond become polar?
- What is the relationship between electronegativity and polarity?
- Why does ice float on water?
- Give the characteristic properties of ionic compounds.
- What characteristic properties do the covalent compound have?
Chemistry Chapter 4 Short Questions PDF Download
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