The température riseses with time it as the substance is heated What is the physical state of the substance at the points A, B, C and D?
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At point A : The substance is in the solid state.
At point B : The substance has started melting. It exists both in the solid and liquid states.
At point C : The substance is in the liquid state.
A point D : The substance has started boiling. It exists both in the liquid and gaseous states.
(b) the melting point of the substance is 15∘C.
(c ) The boiling point of the substance is 110∘C.
(d) The temperature remains the same during the change of state.
(e ) Had substance been water, its melting point should have been 0∘C and boiling point 100∘C. It is therefore, not water.
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