Chapter 2, Problem 56QAP

Interpretation Introduction

(a)

Interpretation:

The chemical formula of silicon disulfide needs to be determined.

Concept introduction:

Naming format for covalent binary compounds:

$\left(\begin{array}{l}\text{prefix}\text{for}\\ \text{least}\text{electronegative}\\ \text{atom}\end{array}\right)\left(\begin{array}{l}\text{name}\text{of}\\ \text{least}\text{electronegative}\\ \text{atom}\end{array}\right)\left(\begin{array}{l}\text{prefix}\text{for}\\ \text{most}\text{electronegative}\\ \text{atom}\end{array}\right)\left(\begin{array}{l}\text{name}\text{of}\\ \text{most}\text{electronegative}\\ \text{atom}\text{ending}\text{with}\text{-ide}\end{array}\right)$

Prefix are used as mono, di, tri, tetra, penta, hexa and so on for the number of each element present in a molecule. Generally, mono prefix is not used while writing the name of covalent compounds as by convection if no prefix is used, then it means there is only 1 atom of that respective element.

Answer to Problem 56QAP

Formula of silicon disulfideis SiS₂.

Explanation of Solution

Chemical name of molecule = silicon disulfide

In this chemical compound:

Least electronegative atom = Silicon and its symbol is Si.

Most electronegative atom = Sulphur and its symbol isS.

Prefix used for least electronegative atom = “none” that means only 1 silicon atom.

Prefix used for most electronegative atom = “di” that means 2sulphur atoms.

Thus, molecular formula for silicon disulfide= SiS₂

Interpretation Introduction

(b)

Interpretation:

The chemical formula of phosphine needs to be determined.

Concept introduction:

Phosphine is a general name forphosphorustrihydride.

Naming format for covalent binary compounds:

$\left(\begin{array}{l}\text{prefix}\text{for}\\ \text{least}\text{electronegative}\\ \text{atom}\end{array}\right)\left(\begin{array}{l}\text{name}\text{of}\\ \text{least}\text{electronegative}\\ \text{atom}\end{array}\right)\left(\begin{array}{l}\text{prefix}\text{for}\\ \text{most}\text{electronegative}\\ \text{atom}\end{array}\right)\left(\begin{array}{l}\text{name}\text{of}\\ \text{most}\text{electronegative}\\ \text{atom}\text{ending}\text{with}\text{-ide}\end{array}\right)$

Prefix are used as mono, di, tri, tetra, penta, hexa and so on for the number of each element present in a molecule. Generally, mono prefix is not used while writing the name of covalent compounds as by convection if no prefix is used, then it means there is only 1 atom of that respective element.

Answer to Problem 56QAP

Formula of phosphine is PH₃.

Explanation of Solution

Phosphine is a general name Phosphorus trihydride.

In given chemical compound:

Least electronegative atom = Phosphorus and its symbol is P.

Most electronegative atom = Hydrogen and its symbol is H.

Prefix used for least electronegative atom = “none” that means only 1 atom.

Prefix used for most electronegative atom = “tri” that means 3 atoms.

Thus, molecular formula for phosphorustrihydride = PH_3.

Interpretation Introduction

(c)

Interpretation:

The chemical formula of diphosphorous pentoxide needs to be determined.

Concept introduction:

Naming format for covalent binary compounds:

$\left(\begin{array}{l}\text{prefix}\text{for}\\ \text{least}\text{electronegative}\\ \text{atom}\end{array}\right)\left(\begin{array}{l}\text{name}\text{of}\\ \text{least}\text{electronegative}\\ \text{atom}\end{array}\right)\left(\begin{array}{l}\text{prefix}\text{for}\\ \text{most}\text{electronegative}\\ \text{atom}\end{array}\right)\left(\begin{array}{l}\text{name}\text{of}\\ \text{most}\text{electronegative}\\ \text{atom}\text{ending}\text{with}\text{-ide}\end{array}\right)$

Prefix are used as mono, di, tri, tetra, penta, hexa and so on for the number of each element present in a molecule. Generally, mono prefix is not used while writing the name of covalent compounds as by convection if no prefix is used, then it means there is only 1 atom of that respective element.

Answer to Problem 56QAP

Formula of diphosphorous pentoxideis P₂O₅.

Explanation of Solution

Chemical name of molecule = Diphosphorous pentoxide

In this chemical compound:

Least electronegative atom = Phosphorous and its symbol is P.

Most electronegative atom = Oxygen and its symbol is O.

Prefix used for least electronegative atom = “di” that means 2phosphorous atoms.

Prefix used for most electronegative atom = “penta” that means 5 oxygen atoms.

Thus, molecular formula for diphosphorous pentoxide= P₂O₅

Interpretation Introduction

(d)

Interpretation:

The chemical formula of radon tetrafluoride needs to be determined.

Concept introduction:

Naming format for covalent binary compounds:

$\left(\begin{array}{l}\text{prefix}\text{for}\\ \text{least}\text{electronegative}\\ \text{atom}\end{array}\right)\left(\begin{array}{l}\text{name}\text{of}\\ \text{least}\text{electronegative}\\ \text{atom}\end{array}\right)\left(\begin{array}{l}\text{prefix}\text{for}\\ \text{most}\text{electronegative}\\ \text{atom}\end{array}\right)\left(\begin{array}{l}\text{name}\text{of}\\ \text{most}\text{electronegative}\\ \text{atom}\text{ending}\text{with}\text{-ide}\end{array}\right)$

Prefix are used as mono, di, tri, tetra, penta, hexa and so on for the number of each element present in a molecule. Generally, mono prefix is not used while writing the name of covalent compounds as by convection if no prefix is used, then it means there is only 1 atom of that respective element.

Answer to Problem 56QAP

Formula of radon tetrafluorideis RnF_4.

Explanation of Solution

Chemical name of molecule = Radon tetrafluoride

In this chemical compound:

Least electronegative atom = Radon and its symbol is Rn.

Most electronegative atom = Fluorine and its symbol is F.

Prefix used for least electronegative atom = “none” that means only 1 radon atom.

Prefix used for most electronegative atom = “tetra” that means 4fluorine atoms.

Thus, molecular formula for radon trifluoride = RnF_4.

Interpretation Introduction

(e)

Interpretation:

The chemical formula of nitrogen trichloride needs to be determined.

Concept introduction:

Naming format for covalent binary compounds:

$\left(\begin{array}{l}\text{prefix}\text{for}\\ \text{least}\text{electronegative}\\ \text{atom}\end{array}\right)\left(\begin{array}{l}\text{name}\text{of}\\ \text{least}\text{electronegative}\\ \text{atom}\end{array}\right)\left(\begin{array}{l}\text{prefix}\text{for}\\ \text{most}\text{electronegative}\\ \text{atom}\end{array}\right)\left(\begin{array}{l}\text{name}\text{of}\\ \text{most}\text{electronegative}\\ \text{atom}\text{ending}\text{with}\text{-ide}\end{array}\right)$

Prefix are used as mono, di, tri, tetra, penta, hexa and so on for the number of each element present in a molecule. Generally, mono prefix is not used while writing the name of covalent compounds as by convection if no prefix is used, then it means there is only 1 atom of that respective element.

Answer to Problem 56QAP

Formula of nitrogen trichlorideis NCl_3.

Explanation of Solution

Chemical name of molecule = Nitrogen trichloride

Nitrogen is more electronegativethan Cl but due to presence of 3 chlorine atoms, N will behave as electropositive(or least electronegative) atom in this case only.

In this chemical compound:

Least electronegative atom = Nitrogen and its symbol is N.

Most electronegative atom = Chlorine and its symbol is Cl.

Prefix used for least electronegative atom = “none” that means only 1 nitrogen atom.

Prefix used for most electronegative atom = “tri” that means 3 chlorine atoms.

Thus,

Molecular formula for nitrogen trichloride = NCl_3.