Hydrogen Sulphide Research Paper

Hydrogen sulphide has a boiling point of -82 degrees Celsius and a melting point of -60 degrees Celsius. There are 2 hydrogen and 1 sulphide molecule. Simple molecule’s which are covalent have lower melting and boiling points as they do not need too much energy to separate the bonds because they are as polarised as water. In hydrogen sulphide the intermolecular forces are known as Dipole-Dipole forces which are less powerful than hydrogen bonding which is in water therefore water has the strongest bond compared to hydrogen chloride and hydrogen sulphide. Water is more electronegative than hydrogen chloride and hydrogen sulphide because there are more molecules in water which are drawn together however in hydrogen sulphide there are less molecules

The molecule hydrogen sulphide contains one sulphide atom however it is less electronegative than oxygen which is found in a water molecule therefore in hydrogen sulphide there are not hydrogen which are connected to any very powerful electronegative molecules for example oxygen, nitrogen and fluorine. However in hydrogen sulphide there are lone pairs of electrons which may be used to make a bind which is known as hydrogen bonds.

Uncontaminated water has a pH value of 7. This means that it is neutral as there is a scale to calculate the acidity or alkalinity of a substance. The scale is from 0-14. Hydrochloric acid is 0 which means it is strongly acidic therefore it is dangerous and corrosive which means that it can burn the skin if you do not wear gloves. Hydrogen sulphide has a pH value of 4.1 this means that it is acidic as any value below 7 is acidic however it is a weak acid therefore it is not corrosive but it is toxic and harmful to the environment. The pH is important as this enables us to be safe and the hydrogen molecules present in a substance can affect how strong

Negative ions are created when atoms have a high electronegative charge when they are bonded by covalent bonds to atoms which have a smaller electronegative charge share more electrons compared to the other atom. That is why a tiny negative charge on the atom; is more electronegative and a tiny positive charge which is on the atom ( that it is connected to the molecule) this bond is called a polar covalent bond. The elements electronegativity rises from the top of the groups in the periodic table and from the left to the right across the period in the periodic table. Hydrogen is an atom however it is not as electronegative as oxygen because hydrogen has an electronegativity value of 2.0 on the Pauling scale but oxygen has an electronegativity value of 3. 5 therefore the difference between these two values is 3.5 -2=1.5 which means that the difference in the electronegativity value for hydrogen and oxygen is 1.5. This difference is the reason why water is a polar molecule specifically a polar covalent molecule. The electronegativity value for sulphur is 2.58 on the Pauling scale of electronegativity this suggest that sulphur is also an electronegative molecule Chloride has an electronegativity value of