The answer is A.Hope this helps
A <span>heating curve having horizontal plateaus at certain points during the heating process means that the process occurs at increase heating. </span>
Explanation:
The basis for classifying changes in matter into physical and chemical change is to see if a material is altered after going through a process.
In a physical change only the state of matter is usually altered especially its form or shape.
Chemical change alters a substance by producing new kinds that are totally different from it.
- In a chemical change, new kinds of matter are usually formed.
- Such changes are usually irreversible.
- Change of state is a reversible process.
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Effective Nuclear charge is represented by a Z * and sometimes Zeff. It's the net positive charge of an electron in a polyelectronic atom (valence electrons) the equation for it is Z*=Z-S
Z is the atomic number and S is the Shielding electrons
