10. If a solid piece of iron is heated and remains at 80°C until it is completely melted, you know that 80°C is (2 pts) *
a. the freezing point of iron
b. the melting point of iron
c. the boiling point of iron
d. both the freezing and melting points of iron
my answer would be B but some how i might think its D, could someone help
The freezing point and the melting point are the same so D is correct.It's called the melting point if it is solid going to liquid at that T; it's called the freezing point if it is going from the liquid to the solid at that T.
Note that iron will NOT melt at 8- C. The melting point of Fe is a little more than 1500 C.
To determine the correct answer, let's review some basic concepts.
The freezing point refers to the temperature at which a substance changes from a liquid to a solid state. In the case of iron, its freezing point is 1538°C. So, option a. is incorrect.
The boiling point indicates the temperature at which a substance changes from a liquid to a gaseous state. As for iron, its boiling point is very high, around 2862°C. Therefore, option c. is also incorrect.
Now, let's focus on the melting point. The melting point refers to the temperature at which a substance changes from a solid to a liquid state. In this scenario, the solid piece of iron is heated and remains at 80°C until it is completely melted. This indicates that 80°C is the temperature at which iron changes from solid to liquid, making option b. the correct answer.
Option d. claims that 80°C represents both the freezing and melting points of iron. However, as mentioned earlier, the melting point is the specific temperature for iron to melt, while the freezing point represents the temperature for iron to freeze. Since 80°C is only the melting point, option d. is incorrect.
In summary, the correct answer is b. the melting point of iron.