Well if the change is reversible then it is a physical change, but if not then it is a chemical change.
Answer :
The number of bonding pairs of electrons around the hydrogen atom = 2
The number of lone pairs of electrons around the hydrogen atom = 0
Explanation :
Lewis-dot structure : It shows the bonding between the atoms of a molecule and it also shows the unpaired electrons present in the molecule.
In the Lewis-dot structure the valance electrons are shown by 'dot'.
The given molecule is, 
As we know that carbon has '4' valence electrons, hydrogen has '1' valence electrons and nitrogen has '5' valence electrons.
Therefore, the total number of valence electrons in
= 1 + 4 + 5 = 10
According to Lewis-dot structure we conclude that, there are 8 number of bonding electrons and 2 number of non-bonding electrons.
The number of bonding pairs of electrons around the hydrogen atom = 2
The number of lone pairs of electrons around the hydrogen atom = 0
11 electrons , 11 protons , 12 neutrons.
Answer:
The presence of a nucleus in all protist organisms means they are all eukaryotic. ... Whether an organism contains one or multiple cells, the nucleus – the first and ... Diatoms; Green Algae – can live in fresh or salt water and sometimes moist ... Microscopy studies can be as easy as using a pipette to drop pond water onto a ...Explanation:
Water
It can be a solid or a liquid