What do the lines on a phase diagram represent?A.The lines distinguish between different molecules being compared.B.The lines show where a phase change happens to a substance.C.The lines form boundaries between the molecular state and the ionic state.D.The lines separate temperature effects from pressure effects.
Question
What do the lines on a phase diagram represent?A.The lines distinguish between different molecules being compared.B.The lines show where a phase change happens to a substance.C.The lines form boundaries between the molecular state and the ionic state.D.The lines separate temperature effects from pressure effects.
Solution
The lines on a phase diagram represent option B. They show where a phase change happens to a substance. These lines, also known as phase boundaries, indicate the conditions of pressure and temperature at which the phases of a substance coexist in equilibrium. For example, the line between the solid and liquid regions on the diagram indicates the melting point at various pressures.
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