Consider the heating curve provided for 1.00 mole of a substance that begins as a solid at -14.8 °C and ends as a gas at 121.1 °C. Specific heat capacities: solid = 145.6 J/mol·°C, liquid = 97.25 J/mol- °C, gas = 68.49 J/mol·°C %3D %3D
States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
Solution
From the heating curve, it is clear that the substance is solid at 
and the melting point of the substance is 
. The substance begins to melt at this temperature and temperature remains constant till the substance is completely converted to liquid. Once the liquifaction is complete, the temperature of the substance rises till its boiling point, 
. The change of state from liquid to gas begins at this temperature and temperature remains constant till the substance is completely converted into gas. Once the vapourisation is complete temperature of the substance increases when heat is supplied.
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