Page 78 - Chemistry_Form_2

Chemistry
for Secondary Schools

Table 3.6: Chemical compounds present in toothpaste
Compound Formula Ionic or covalent compound

FOR ONLINE READING ONLY

Questions:
(a) In which ways do the ionic and covalent compounds found in toothpaste
differ?

(b) Which compound is in the largest amount in the toothpaste?

Exercise 3.5

1. What is the name of NH ? Why is it an exception in its nomenclature
3
compared to other nitrogen compounds?
2. Write the IUPAC names of the following compounds:
(a) FeCl 2

(b) SO
2
(c) P O
4 10
(d) NO 2

3. Name the compound formed when zinc combines with oxygen.

Chapter summary

1. Chemical bonding involves electrons in the outermost shell of an atom.
When the outermost shell is fully filled, the atom is said to be stable.

2. Ions are formed when an atom gains or loses electron(s). Cations are
positively charged ions that result from atoms losing one or more electrons.
Anions are negatively charged ions that result from atoms gaining one or
more electrons.
3. Ionic (electrovalent) bonding usually occurs between a metal and a non-
metal. It involves the transfer of electron(s) from the atoms of the metal to
the atoms of the non-metal.

Student’s Book Form Two 71

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