Respuesta :
Answer:
The temperature is always lower.
Explanation:
The temperature is always lower at the end of the state as compared to beginning of the state. We can see in the given data, the temperature is higher at the beginning i. e. 140 degree Celsius but with the passage of time, the temperature of a state decreases constantly and the temperature at the end is lower i. e. 20 degree Celsius. So we can conclude that the temperature is always lower.
We want to study how the temperature behaves in a change of phase. Ideally, we would read a graph and use the given information, but we can't see the graph, so for the answer, I will use a general thermodynamics knowledge instead of the missing graph.
We will see that the correct option is: The temperature is always the same
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Let's start by explaining how temperature manifests in objects.
Assume we have something in solid phase. As we increase the temperature, the particles on the solid increase their kinetic energy, thus, the particles move more.
This causes that the volume of the object increases (for example when we heat up a metal and it dilates). This keeps happening until we reach a critical point, when we are near a change of phase.
At this point the energy given is not used to increase the temperature of the object, but is used to "break" bonds in such a way that the particles are more free than before. When all these bonds are "broken" the change of phase is completed, and in the case of the solid, we go from solid phase to liquid phase.
An example of this is that we can have liquid water and solid water both at 0°C, so if you have a thermometer in your home, an experiment that you can do is:
Put water in the refrigerator.
Note when the liquid water reaches 0°C
As the water starts to solidify, keep recording its temperature, you will see that it does not change (a lot, it may change a little bit) until all the water changes of phase.
So to answer this;
how does the temperature at the beginning of a change of state compare with the temperature at the end of the change?
The temperature is always the same
If you want to learn more, you can read:
https://brainly.com/question/11804615
