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During a change of state why doesn't the temperature of a substance change.?
Wiki User
∙ 9y ago
It's easier to understand if we talk about it in terms of heating, but it's the same reason for cooling, except backward.
Crudely speaking, all the energy is being used to overcome the attractive forces between the atoms or molecules of the substance, rather than going directly into kinetic energy. Since temperature is a measure of the average kinetic energy, the temperature will not rise until the substance has fully changed state. At that point the energy being added in the form of heat will start increasing the kinetic energy of the particles again and the temperature will rise.
Wiki User
∙ 9y ago
Wiki User
∙ 9y agoA substance has fixed melting point and freezing point. Once the temperature reaches to that point, the change in the state of that substance begins and continues till all the substance is changed to that state. For example water has fixed melting and boiling points for change into liquid and steam formation.
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What doesnt change during the composition of a substance?
The composition of a chemical compound is not changed during a physical change.
When a physical change in a sample occurs which does not change?
Substance in the material Remain the same
Did the temperature fluctuate while the is melting?
No. The temperature does not change during the melting process. All of the heat energy is used to break the bonds of the solid to form a liquid, i.e. the energy is used in the phase change, and thus is not used to raise the temperature.
a change in the chemical properties of substance results in a?
A substance can take on three physical states: Solid, liquid, or gas. The main physical changes from a thermodynamic standpoint are the amount of entropy(disorder) of the molecules of the substance. Density, temperature, volume are also characteristically different at each physical state and can be used to manipulate compounds between the three.
Why doesnt air temperature change uniformly with altitude?
Altitude doesn't change uniformly because the four main layers of the atmosphere have different temperature gradients, creating the thermal structure of the atmosphere.
What doesnt change during the composition of a substance?
The composition of a chemical compound is not changed during a physical change.
Is it true that a star doesnt change its size or temperature during its life?
No, that's not true.
Explain why the temperature of Wax remains constant during solidification?
it's because it releases the latent heat of fusion. Latent heat means energy is given out when a substance changes from liquid to solid without a change in temperature. and the transfer of energy doesnt change the KE of the particles, so the temperature remains unchanged. lanten heat gives rise to the change in PE of the particles during the change of state only
What is a property of matter that doesnt change a substance into a new substance?
Physical property of matter
Why does the temperature not change during a phase change?
During the change of state, the molecules of a substance absorb energy to overcome the strong intermolecular force of attraction between them. Hence the heat energy which we supply is absorbed by them for this purpose. So change in temperature is not observed.
When a physical change in a sample occurs which does not change?
Substance in the material Remain the same
Did the temperature fluctuate while the is melting?
No. The temperature does not change during the melting process. All of the heat energy is used to break the bonds of the solid to form a liquid, i.e. the energy is used in the phase change, and thus is not used to raise the temperature.
When liquid is boiling its temp doesnt change?
At the boiling point the temperature remain unchanged.
a change in the chemical properties of substance results in a?
A substance can take on three physical states: Solid, liquid, or gas. The main physical changes from a thermodynamic standpoint are the amount of entropy(disorder) of the molecules of the substance. Density, temperature, volume are also characteristically different at each physical state and can be used to manipulate compounds between the three.
Why doesnt air temperature change uniformly with altitude?
Altitude doesn't change uniformly because the four main layers of the atmosphere have different temperature gradients, creating the thermal structure of the atmosphere.
Is the fermenting of cheese a physical change?
"A physical change is any change not involving a change in the substance's chemical identity. Matter undergoes chemical change when the composition of the substances changes: one or more substances combine or break up (as in a relationship) to form new substances" From This I gather that its a physical change as the cheese isn't changed into another substance, The cheese doesnt change, for example it doesnt taste or smell different, But its physical propertys do change it looks different
How does rain affect air temperatures?
rain doesnt actualy change the temperature although it may feel like it
