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When you heat a substance how can you tell it has undergone a phase change?
Wiki User
∙ 14y ago
Specific heat is used to identify substances. It is the amount of heat that is needed to raise a sample unit by one degree Celsius and is unique to each element, and therefore, unique to each compound.
Wiki User
∙ 9y ago
Wiki User
∙ 14y agoThere are 3 phases a substance can have. Solid, liquid, gas. If you heat a solid, when it becomes a liquid it has changed phases. If you heat a liquid, when it become gas (i.e. boils) it has changed phase.
Wiki User
∙ 11y agoYes. You can measure melting point of a solid, and boiling point of a liquid to help identify the substance. You could also measure temperature change for a set amount ot the substance for a given amount of heat absorbed. Use this to calculate the specific heat capacity and this would help to identify the substance.
Wiki User
∙ 10y agoyes lol
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The energy involved in a phase change is called the?
Heat associated with phase change is called Latent Heat
What A steep slope on a phase-change graph indicates?
Different
Why does temperature stay the same during a phase change?
The temperature, in Physics, means the measure of Kinetic Energy in a substance. When a substance is either heated or cooled, Kinetic Energy is either being added to taken away from the substance. When the amount of KE in the substance changes, the temperature change. However, when the substance is changing its state, because all the KE change in the substance is being used up to change the state, the temperature will not change. When the substance is changing state, the KE can be measured by calculating the heat of fusion and heat of vaporization.
How do you describe each phase change?
Endothermic phase changes - the substance is gaining energy (being heated) and the molecules are getting more active.- solid to liquid: melting- liquid to gas: vaporization- solid to gas: sublimationExothermic phase changes - the substance is losing energy (cooling) and the molecules are slowing down.- gas to liquid: condensation- liquid to solid: freezing- gas to solid: depositionMemory helper: exo is like exit, and the heat energy exits the substance during an exothermic phase change.
What is the energy to make a phase change?
latent heat
What has to be added to a substance to cause a phase change?
Heat energy must be added to or subtracted from a substance to cause a phase change.
Why does temperature no change during energy phase change?
During a phase change, the heat transferred to a substance is used to break intermolecular forces (latent heat), and thus the temperature of the substance does not change. The opposite also occurs: heat is transferred from a substance during a phase change without a decrease in temperature as intermolecular bonds form.
Latent heat is the energy required for 1 kg of a substance to change?
Latent heat is the energy required for 1 kg of a substance to change ___________. phase
What change phase is heat energy absorbed by a substance?
liquid to gas
What The heat of fusion of a substance is the energy measured during a?
phase change
Why does heat applied to a substance change its temperature or make it change its phase?
compound of iron
What is a latent heat energy levels?
Latent heat- the amount of heat required by a system/ substance to change phase. It's also heat absorbed or radiated during a change of phase at a constant temperature and pressure.
As heat is added to a substance undergoing a phase change. why does the temperature remain?
Basically what it comes down to is the substance that is left behind during the phase change (say the liquid when it is changing to a vapor) has a lower internal energy than it had before the phase change started. To maintain the substance at its original temperature, an equivalent amount of energy must be added to make up for the loss of internal energy due to the phase change. (Conservation of Energy)The energy added in this case is heat, which in turn causes more molecules of the substance to change phases and lowers the internal energy & the process repeats. This is why the temperature remains constant as you add heat to a substance during a phase change. Once the phase change is completed the added heat will eventually cause the temperature to rise in the new phase of the substance. Hope this explanation helps. It's kind of hard to explain without a basic knowledge of thermodynamics.
How much heat does it take to raise the temperature of a substance one degree?
The amount of heat required is called the specific sensible heat for the substance. Sensible, in this context, means something which can be sensed. This is in contrast to latent heat which is used to change the phase of a substance without a change in temperature.
What During a phase change the temperature of a substance .?
The temperature* remains unchanged. * The heat (energy) content changes.
What happen to the temperature of a substance during a phase change?
The temperature* remains unchanged. * The heat (energy) content changes.
Do substances absorb or release heat energy as then change from a liquid to the solid phase?
When a substance changes from a liquid to a solid it releases energy. (You take the heat out)
