Answer:
The answer for the frist one is C is a chemical property and D is a physical property. The sconed one this implies both the atoms have the same nucleus but different charges so it can be concluded that they are both the atoms of the same element but one of them is electrically neutral and the other has stable electronic configuration.
Explanation:
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Ionic reaction when a metal and non metal are together a molecule is when a metal abs metal react hope this helps
ANS: C = 85.63 %; H = 14.37 %
C = 2 x 12.01 u = 24.02 u
H = 4 x 1.008 u = 4.032 u
TOTAL = 28.052 u
% C = (24.02/28.052) x 100 % = 85.63 %
% H = (4.032/28.052) x 100 % = 14.37 %
Isotope is my answer
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B, hydrogen bond is formed when H is bonded to F, O and N