Answer Guide Unit S3_6B

MCQ  Answer  Area of Chemistry
1. C  [Diatomic Elements]
2. C  [Compounds/ Ionic Compounds – Structure/ Bonding]
3. D  [Chemical Formula – Prefixes]
4. B  [Compounds/ Covalent Compounds – Structure/ Bonding]
5. A  [Compounds/ Ionic Compounds – Structure/ Bonding]
6.  C  [Compounds/ Ionic Compounds – Structure/ Bonding]
7.  D  [Compounds/ Covalent Compounds – Structure/ Bonding/ Properties]
8. B  [Compounds/ Covalent Compounds – Structure/ Bonding]

 

9 a) K+Cl– b) Mg2+(Br–)2 c) Ca2+S2-
d) Ca2+(H–)2 e) (Na+)2O2- f) Li+Cl–
g) Pb4+(O2-)2 h) Al3+(Br–)3 i) Cs+Cl–
  [Chemical Formula – Valency]
10.
a) SiC
  [Problem Solving]
b) i)   does not have freely moving charged particles/
  [Bonding -Properties]
 ii)  Covalent network compounds – breaking strong covalent bonds requires a lot of energy
  [Bonding -Properties]
 11.
 a)  The strong bonds between atoms that are joined by covalent bonds are the result of electrostatic attraction between the positive nuclei of the atoms and the pairs of negative electrons that are shared between them.
  [Bonding – Covalent Bond]
 b)  
 i) 
b44b723c3e8c7d95fb927ac1bf56269c3c8bc454
  [Bonding -Diagrams]
 ii)
electronic-geometry-of-ammonia-molecule
  [Bonding – Molecular Shapes]
 12.
  The positive nuclei from two different atoms (hydrogen & chlorine) are held together by their common attraction for the shared pair of electrons held between them.Hydrogen-Chloride-Molecule
  [Bonding]
 13.
  i)  C3H9N
 [Chemical Formula]
 ii)  molecule
 [Bonding]
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