Tag: chemistry

A covalent bond is formed between non metal atoms, which combine together by sharing electrons. covalent compounds have low melting points, do not dissolve in water, and do not conduct an electric current in solution that make them non-polar. 
Thus, Option "B" is correct.

The hydrogen bonds in an ice molecule are more apart than those in water molecules. Hence ice is loosely packed and is less densed than water. 

 Covalent bonds are directional, meaning that atoms so bonded prefer specific orientations relative to one another, hence they have distinct geometries.

Covalent compounds do not show ionic reaction. 

The increasing order of forces of attraction between the molecules can be written as;
$O _{2}$(weak Van der waal forces) < HCl( dipole-dipole interactions) < $H _{2}O$( hydrogen bonding) < Hg( metallic bond) < NaCl (ionic bonding)

A solid which is transparent to visible light and whose conductivity increases with temperature is
formed by covalent bonding, like a semi conductor.

Covalent compounds have negligible forces of attraction and these are gases e.g. $HCl$, sulfur dioxide,carbon dioxide and methane. There are weak forces of attraction and such covalent substances are low boiling temperature liquids such as ethanol so boils rapidly and gives off smell.

In the above question element A is equivalent to chlorine& B to sodium thus the structure besides shows the bonding giving rise to $NaCl$ Hence for our eg, it is $BA$.

Ionic compounds are soluble in water whereas covalent compounds are insoluble in water.

Covalent bonds between atoms are quite strong, but attractions between molecule/compounds  or intermolecular forces, can be relatively weak. Covalent compounds generally have low boiling and melting points, and are found in all three physical states covalent bonds between atoms are quite strong, but attractions between molecules/compounds or intermolecular forces, can be relatively work. Covalent compounds generally have low boiling and melting points, and are found in all three physical states at room temperature. at room temperature.