(a)
Interpretation:
To write the chemical formula of methane.
Concept introduction:
Methane is first member of Alkane family that has only 1 carbon atom (‘meth’ prefix used for 1 carbon).
General molecular formula for
Where n represents the number of carbon atoms.
Answer to Problem 55QAP
Chemical formula of methane is CH4.
Explanation of Solution
Methane is a member of Alkane family that has only 1 carbon atom and general formula for molecular formula of Alkane is:
Where n represents the number of carbon atoms.
Therefore,
Molecular formula of methane:
(b)
Interpretation:
To write the chemical formula of carbon tetraiodide.
Concept introduction:
Naming format for covalent binary compounds:
Prefixes are used as mono, di, tri, tetra, penta, hexa and so on for the number of each element present in a molecule. Generally, we don’t use mono prefix while writing the name of covalent compoundsas by convection if no prefix is used, then it means we have 1 atom of that respective element.
Answer to Problem 55QAP
Formula of carbon tetraiodide is CI4.
Explanation of Solution
Here we have:
Chemical name of molecule = Carbon tetraiodide
In this chemical compound:
Least electronegative atom = Carbon and its symbol is C.
Most electronegative atom = Iodine and its symbol is I.
Prefix used for least electronegative atom = “none” that means only 1 carbon atom.
Prefix used for most electronegative atom = “tetra” that means only 4 Iodine atoms.
Thus,
Molecular formula for carbon tetraiodide = CI4
(c)
Interpretation:
To write the chemical formula of hydrogen peroxide.
Concept introduction:
Hydrogen peroxide is also known as dihydrogen dioxide.
Naming format for covalent binary compounds:
Prefixes are used as mono, di, tri, tetra, penta, hexa and so on for the number of each element present in a molecule. Generally, we don’t use mono prefix while writing the name of covalent compounds as by convection if no prefix is used, then it means we have 1 atom of that respective element.
Answer to Problem 55QAP
Formula of hydrogen peroxide is H2 O2.
Explanation of Solution
Here we have:
Chemical name of molecule = Hydrogen peroxide
Its other name is dihydrogen dioxide.
In this chemical compound:
Least electronegative atom = Hydrogen and its symbol is H.
Most electronegative atom = Oxygen and its symbol is O.
Prefix used for least electronegative atom = “di” that means only 2 atoms.
Prefix used for most electronegative atom = “di” that means only 2 atoms.
Thus,
Molecular formula for dihydrogen dioxide = H2 O2.
(d)
Interpretation:
To write the chemical formula of nitrogen oxide.
Concept introduction:
Naming format for covalent binary compounds:
Prefixes are used as mono, di, tri, tetra, penta, hexa and so on for the number of each element present in a molecule. Generally, we don’t use mono prefix while writing the name of covalent compounds as by convection if no prefix is used, then it means we have 1 atom of that respective element.
Answer to Problem 55QAP
Formula of nitrogen oxide is NO.
Explanation of Solution
Here we have:
Chemical name of molecule = Nitrogen oxide
In this chemical compound:
Least electronegative atom = Nitrogen and its symbol is N.
Most electronegative atom = Oxygen and its symbol is O.
Prefix used for least electronegative atom = “none” that means only 1 nitrogen atom.
Prefix used for most electronegative atom = “none” that means only 1 oxygen atom.
Thus,
Molecular formula for nitrogen oxide = NO
(e)
Interpretation:
To write the chemical formula of silicon dioxide.
Concept introduction:
Naming format for covalent binary compounds:
Prefixes are used as mono, di, tri, tetra, penta, hexa and so on for the number of each element present in a molecule. Generally, we don’t use mono prefix while writing the name of covalent compounds as by convection if no prefix is used, then it means we have 1 atom of that respective element.
Answer to Problem 55QAP
Formula of silicondioxide is SiO2.
Explanation of Solution
Here we have:
Chemical name of molecule = Silicon dioxide
In this chemical compound:
Least electronegative atom = Silicon and its symbol is Si.
Most electronegative atom = Oxygen and its symbol is O.
Prefix used for least electronegative atom = “none” that means only 1 silicon atom.
Prefix used for most electronegative atom = “di” that means 2 oxygen atoms.
Thus,
Molecular formula for silicon dioxide = SiO2
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Chapter 2 Solutions
OWLV2 FOR MASTERTON/HURLEY'S CHEMISTRY:
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