when chlorophyll a molecules absorb energy the molecules

They are pigments capable of absorbing radiant energy of the sun. Pigments are chemically porphyrin molecules which have a metal ion at the centre. The metal ion in haemoglobin is iron and in chlorophyll, it is magnesium. There are two types of photosyntheti..

. Chlorophyll a has methyl group (-CH 3 ) at position and aldehyde (CHO) group in chlorophyll b. Chlorophyll a is the major pigment involved in trapping light energy and converting it in to electrical and chemical energy. It acts as a reaction centr..

It is formed by the combination of two hydrogen atoms. Each hydrogen atom has one electron in 1s-orbital and, therefore, there are two electrons in hydrogen molecule. Both these electrons are to be accommodated in the lowest energy molecular orbital. According to Pauli's e..

The concentration of chlorophyll affects the rate of reaction as they absorb the light energy without which the reactions cannot proceed. Lack of chlorophyll or deficiency of chlorophyll results in chlorosis or yellowing of leaves. It can occur due..

The radiant energy from the sun is the source of both light and heat energy to photosynthesis. Light energy is harvested by the pigments in order to carry out the breaking down of water molecule into hydrogen and oxygen. This is an energy-intensive..

Hydrogen Molecule (H 2 ) - It is formed by the combination of two hydrogen atoms. Each hydrogen atom has one electron in 1s-orbital and, therefore, there are two electrons in hydrogen molecule. Both these electrons are to be accommodated in the lowest energy molecular ..

N 2 molecule has 14 electrons. fig 1.19 - Molecular orbital energy level diagram for N 2 moleculeThe molecular orbital electronic configuration of the molecule is: N 2 : KK( s 2s) 2 ( s *2s) 2 ( p 2p x ) 2 ( p 2p y ) 2 ( s 2p z ) 2..

The energy required per mole of chlorine is 'enthalpy of dissociation' represented by ( d )..

. The single bond in the molecule is also in agreement with bond dissociation energy of 155 kJ mol - 1 and bond length equal to 142 p..

Oxygen Molecule (O 2 ) - Therefore, oxygen molecule has 16 electrons. In the formation of molecular orbitals, the electrons in the inner shells are expressed as KK denoting ( s 1s) 2 ( s *1s) 2 .The remaining 12 electrons are filled in molecular orbitals. fig 1.20 - Molecular or..