Answer:
hair is a physical change.
Cooking is a physical and chemical change.
Ice cream melting in the sun is a physical change.
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This demonstrates the boiling point. The substance changes from liquid to gas which is the point of vaporization and since it is from heat, it is boiling.
What was part a ? there is no way we can answer without backstory .
The empirical formula of a substance = C₄H₅N₂O
<h3>Further explanation </h3>
The empirical formula is the smallest comparison of atoms of compound forming elements.
A molecular formula is a formula that shows the number of atomic elements that make up a compound.
<em>(empirical formula) n = molecular formula </em>
((empirical formula)n=C₈H₁₀N₄O₂
divide by 2 :
(C₄H₅N₂O)₂=C₈H₁₀N₄O₂
