Question

11. Why does the temperature of a substance remain constant during its melting point
or boiling point ?
12. What are the postulates of Bohr's model of an atom?
13. Define the terms and give one example of each
(a) Bilateral Symmetry
(b) Coelom
(c) Triploblastic
14. An element is sonorous and highly ductile under which category would you
classify this element? what other characteristics do you expect the element to
possess?
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Answer 1

Answer:

The 'temperature of a substance' remains constant during its melting and boiling point because the change in any state of matter as n solid to liquid or the liquid to a gas involves crossing the 'latent heat of fusion' which causes a change in the intermolecular spacing of the molecules in the substance