Which of the following statement(s) is/are true regarding boiling water?
The lower the atmospheric pressure, the more difficult it is to boil water.
The lower the atmospheric pressure, the easier it is to boil water.
It is possible to boil water below 100°C.
It is possible for water to reach 100°C before boiling.
Water will always boil at 100° regardless of any environmental conditions,
The statement "The lower the atmospheric pressure, the easier it is to boil water" is true.
The statement "It is possible to boil water below 100°C" is true. When the atmospheric pressure is reduced, the boiling point of water also decreases. This is why water can be made to boil at temperatures below 100°C in high-altitude regions.
The statement "It is possible for water to reach 100°C before boiling" is false. Water reaches its boiling point at 100°C, and at this point, it starts to vaporize and convert into steam.
The statement "Water will always boil at 100°C regardless of any environmental conditions" is false. The boiling point of water is dependent on the atmospheric pressure. At sea level, where the atmospheric pressure is around 1 atm, water boils at 100°C. However, at higher altitudes where the atmospheric pressure is lower, the boiling point of water decreases.
To determine which of the statements are true regarding boiling water, let's examine each statement individually:
1. The lower the atmospheric pressure, the more difficult it is to boil water.
2. The lower the atmospheric pressure, the easier it is to boil water.
Statement 1 and statement 2 are contradictory. In reality, as the atmospheric pressure decreases, it becomes easier to boil water. This is because the boiling point of a liquid is the temperature at which its vapor pressure equals the pressure of the atmosphere or surroundings. At higher altitudes where the atmospheric pressure is lower, the boiling point of water decreases. So, statement 2 is true, while statement 1 is false.
3. It is possible to boil water below 100°C.
4. It is possible for water to reach 100°C before boiling.
Statements 3 and 4 are related to the concept of superheating. Superheating refers to the process of heating a liquid above its boiling point without it actually boiling. This can occur if the water is extremely pure and free from impurities that can provide nucleation sites for boiling. Therefore, statement 3 is true, and statement 4 is also true under certain conditions.
5. Water will always boil at 100°C regardless of any environmental conditions.
Statement 5 is false. The boiling point of water is typically considered to be 100°C at sea level under standard atmospheric pressure. However, the boiling point can change depending on factors such as altitude and the presence of impurities. At higher altitudes, where the atmospheric pressure is lower, the boiling point of water decreases. Additionally, the presence of impurities can raise or lower the boiling point. Therefore, water will not always boil at 100°C under different environmental conditions.
In summary, the true statements regarding boiling water are:
- The lower the atmospheric pressure, the easier it is to boil water.
- It is possible to boil water below 100°C.
- It is possible for water to reach 100°C before boiling.
- Water will not always boil at 100°C under different environmental conditions.
Regarding boiling water, the following statement(s) are true:
1. The lower the atmospheric pressure, the easier it is to boil water. This is because the boiling point of water decreases as the atmospheric pressure decreases. At higher altitudes where atmospheric pressure is lower, water can boil at temperatures below 100°C.
2. It is possible to boil water below 100°C. As mentioned above, at higher altitudes where atmospheric pressure is lower, water can boil at temperatures below the standard boiling point of 100°C.
3. Water will always boil at 100°C regardless of any environmental conditions. This statement is not true. The boiling point of water is influenced by atmospheric pressure. At sea level, where atmospheric pressure is approximately 1 atmosphere, water boils at 100°C. However, at higher altitudes where the atmospheric pressure is lower, the boiling point of water decreases. Similarly, if the atmospheric pressure is increased, such as in a pressure cooker, the boiling point of water can be higher than 100°C.