Answer:
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Answer:
The answer is A. Polar covalent; negatively
Explanation:
Hydrogen bonds form between molecules containing polar covalent bond the hydrogen bond is been a hydrogen atom of one molecule and a partially negative charged atom of another.
Example
(water):- It contain a slight positive charge on one side and a slight negative charge on the other.
B.
I hope this will help a bit (Forgive me of its wrong pls)
Liquids have a definite volume, but not a definite shape. Hope this helps :)
It is called exothermic reaction because it releases heat and light and it is called combustion reaction because it is reacting and is being oxidised by O2 to MgO.
It can also be called as oxidation reaction since Mg is oxidised to MgO.