which one of these is true?
Which of the following statements is true?
1) The freezing and boiling temperatures of a substance are the same.
2) The freezing and condensation temperatures of a substance are the same.
3) The freezing and melting temperatures of a substance are the same.
4) The freezing, melting, and boiling temperatures of a substance are the same.
The freezing and melting temperatures of a substance are the same.
To determine which one of the statements is true, we need to understand the definitions of freezing, boiling, condensation, and melting temperatures.
1) The freezing temperature of a substance is the temperature at which it changes from a liquid to a solid state. The boiling temperature is the temperature at which it changes from a liquid to a gaseous state. These two temperatures are not the same because they represent different phase transitions.
2) Condensation is the process where a substance changes from a gaseous state to a liquid state. The freezing temperature is related to the transition from a liquid to a solid state, whereas the condensation temperature is related to the transition from a gas to a liquid state. Therefore, statement 2 is also not true as these two temperatures represent different phase transitions.
3) Melting is the process where a substance changes from a solid state to a liquid state. The freezing temperature is the temperature at which a substance changes from a liquid to a solid, which is essentially the reverse of melting. Therefore, statement 3 is true as the freezing and melting temperatures of a substance are indeed the same.
4) Statement 4 implies that all three transitions (freezing, melting, and boiling) occur at the same temperature. This is not true since these transitions occur at different temperatures.
Based on the explanations above, the true statement is:
3) The freezing and melting temperatures of a substance are the same.