Originally Posted by Gokul43201
EDIT : Whoops !! Looks like my guess is similar to what The Bob is saying.
The Bob : have you read this somewhere ? If you have a reference or source, that would be useful. My post is merely an educated guess.
Salters Advacned Chemistry Textbook - Chemical Ideas (Second Edition) - Section 5.2 Pg. 91.
are both in Group 4 and similar properties of the two would be expected. However, CO2
is a gas (R.T.P.) and SiO2
is a solid (R.T.P.). The physical properties are different due to the bonding. Both are covalent compounds but the size of the carbon atom makes it possible to form double bonds with oxygen. Therefore, CO2
is made of individual molecules. The attraction between the forces are weak (weak intermolecule forces of attraction). Little energy is need to seperate them so it is a gas (R.T.P.).
Silicon atoms are larger than carbon atoms and they normally bond to four oxygens. Quartz (SiO2
) is an extended network of SiO4
units, where the central silicon is covalently bonded to four oxygen atoms. Each silicon atom has a half-share of oxygens. Due to this large strucure, it is insoluable in water and has a high melting and boiling points (making it a solid at room temperature) because of the strong covalent bonding throughout Quartz.
Carbon dioxide is an example of a covalent molecular structure.
Silicon (IV) oxide is an example of a covalent network structure.
The Bob (2004 ?)