brodidit for students
Structure of molecules
Class 9 · Chemistry · 6 questions
Name: ____________________ Date: ____________
A bond formed by the transfer of electrons is called:
- A Covalent
- B Metallic
- C Ionic
- D Hydrogen
A bond formed by sharing of electrons is called:
- A Covalent
- B Ionic
- C Dative only
- D Electrovalent
Which of these is an ionic compound?
- A Water
- B Methane
- C Carbon dioxide
- D Sodium chloride
How many electrons are shared in the double bond of O2?
- A 6
- B 1
- C 2
- D 4
Ionic compounds usually have:
- A Gas state at room temperature
- B High melting points
- C Low melting points
- D No melting point
A compound that conducts electricity when molten is most likely:
- A A noble gas
- B Ionic
- C A non-polar liquid
- D Covalent
Answer key
1. C, 2. A, 3. D, 4. D, 5. B, 6. B
An ionic bond forms when electrons move from one atom to another.
Sharing of electron pairs gives a covalent bond.
Sodium chloride is formed from Na+ and Cl- ions.
A double bond is two shared pairs, so 4 electrons are shared.
Strong attraction between ions gives high melting and boiling points.
Molten ionic compounds have free moving ions that carry current.