Which of the following formula represents a molecular substance? - ProProfs Discuss
Topics
Products
Follow Us:

Which of the following formula represents a molecular substance?

Which of the following formula represents a molecular substance?

Change Image    Delete



A. CaO
B. CO
C. Al2O3
D. Li2O

This question is part of Chemistry Regents Prep #1
Asked by Ashante Blackman, Last updated: May 28, 2020

+ Answer
Request

2 Answers

N. Kingsley

N. Kingsley, Writer, Columbus

Answered Jul 17, 2018

Carbon monoxide or CO is the molecular substance in this equation. In order to form a molecule, the atoms must share their electrons rather than completely give or take them away. On all the other options, the atoms either take or give away electrons completely. This gives them a positive or a negative configuration which results in ionic structures instead of molecules. Covalent bonds have an electronegativity difference of less than 1.7.

However, all the options except carbon monoxide have a much higher difference. This makes them all ionic and hence wrong answers. Covalently liked structures, with sharing of electrons, form molecules.

 

John Smith

John Smith

Answered Jan 30, 2017

CO represents a molecular substance here. So, the correct option will be B.

To understand the answer,you need to determine the electronegativity difference of each of the choices. The difference between Carbon (2.6) and Oxygen (3.4) in CO is 0.9 or in the range of covalent bonding (covalent bonds have electronegativity differences of less than 1.7). The other three compounds have differences in the ionic bond range or over 1.7. Hence, it is the correct answer.

 

Search for Google images
Select a recommended image
Upload from your computer
Search for Google images
Select a recommended image
Upload from your computer
Search for Google images
Select a recommended image
Upload from your computer

Email Sent
We have sent an email to your address "" with instructions to reset your password.