1. What is the physical state of the substance at the points A, B, C and
D ?
2. What is the melting point of the substance ?
3. What is its boiling point ?
4. Which portions of the graph indicates that change of state is taking place.
5. Name the terms used for heat absorbed during change of states involved in above processes.
Answers
Answer:
1. It exists both in the solid and liquid states. At point C : The substance is in the liquid state. At point D : The substance has started boiling . It exists both into the liquid and gaseous states.
2. Melting point, temperature at which the solid and liquid forms of a pure substance can exist in equilibrium. As heat is applied to a solid, its temperature will increase until the melting point is reached. More heat then will convert the solid into a liquid with no temperature change.
3.Boiling point, temperature at which the pressure exerted by the surroundings upon a liquid is equaled by the pressure exerted by the vapour of the liquid; under this condition, addition of heat results in the transformation of the liquid into its vapour without raising the temperature. Water at its boiling point.
4. The A 1 to B 1 and D 1 to D 2 . Or Straight lines in the curve parallel to Time-axis (x-axis) indicate the change of state. These portions are to (Solid to liquid) and to (Liquid to vapor state)
5. Latent heat is the heat released or absorbed by a body during the process without change in temperature of the system. This happens while change of state of matter meaning a phase transition.
Answer:
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Explanation:
It exists both in the solid and liquid states. At point C : The substance is in the liquid state. At point D : The substance has started boiling . It exists both into the liquid and gaseous states.
2. Melting point, temperature at which the solid and liquid forms of a pure substance can exist in equilibrium. As heat is applied to a solid, its temperature will increase until the melting point is reached. More heat then will convert the solid into a liquid with no temperature change.
3.Boiling point, temperature at which the pressure exerted by the surroundings upon a liquid is equaled by the pressure exerted by the vapour of the liquid; under this condition, addition of heat results in the transformation of the liquid into its vapour without raising the temperature. Water at its boiling point.
4. The A 1 to B 1 and D 1 to D 2 . Or Straight lines in the curve parallel to Time-axis (x-axis) indicate the change of state. These portions are to (Solid to liquid) and to (Liquid to vapor state)
5. Latent heat is the heat released or absorbed by a body during the process without change in temperature of the system. This happens while change of state of matter meaning a phase transition.