hey guys, im having trouble answering this question. is there any way you can help me?
During a lab experiment demonstrating the relationship between pressure and water, Mr. Demming puts a beaker of water into a vacuum chamber. Once the chamber is sealed, Mr. Demming turns the vacuum on. As the pump starts to take air out of the chamber, the air pressure inside drops relative to the pressure outside the chamber. After a few minutes, there is next to no air pressure in the chamber.
What do you expect to observe in the experiment?
water starts to boil
google water in a vacuum for discussions
In this experiment, the beaker of water is being placed inside a vacuum chamber, and as the vacuum pump starts removing the air from the chamber, the air pressure inside the chamber decreases. This situation can be observed and explained as follows:
1. Initially, when the pump is turned on, the air pressure inside the chamber will start decreasing rapidly. This is because the pump is removing air molecules from the chamber, causing the density of air particles inside to decrease.
2. As the pressure inside the chamber drops relative to the pressure outside, the water in the beaker will start to experience the effects of reduced external pressure. This can lead to various observations:
a. Boiling point reduction: As pressure decreases, the boiling point of water also decreases. Given that water evaporates at different rates under different pressures, it is possible that the water in the beaker may start to boil even without the application of heat.
b. Formation of bubbles: When the pressure drops, the dissolved gases in the water may start to come out of solution and form bubbles. These bubbles can be seen rising to the surface of the water.
c. Expansion of the water: Decreased pressure can cause the water to expand slightly, leading to a small increase in volume.
d. Evaporation: With reduced pressure, the water molecules on the surface can have enough energy to overcome the atmospheric pressure and escape as water vapor.
3. Over time, as more and more air is removed from the chamber, the air pressure inside will continue to decrease. Eventually, there will be next to no air pressure in the chamber, resulting in the absence of air inside.
Please note that the exact observations may vary depending on the specific conditions and variables of the experiment, but these are the general expectations for this setup.
Yes, I can help you with that question. Based on the information provided, we can expect to observe the following in the experiment:
1. As the pump starts to take air out of the vacuum chamber, you will notice the pressure inside the chamber dropping. This is because the pump is removing air molecules from the chamber, reducing the number of particles and therefore reducing the pressure.
2. Since the pressure inside the chamber is decreasing, the water in the beaker will start to boil. This happens because the boiling point of water decreases as the pressure decreases. The reduced air pressure inside the chamber allows the water molecules to escape as vapor more easily.
3. As the pressure inside the chamber continues to drop, you may observe bubbles forming in the water. These bubbles are formed by the vaporized water molecules escaping from the surface of the water.
4. Eventually, as the pressure inside the chamber reaches a very low level, you will observe that the bubbles in the water become smaller or stop forming altogether. This indicates that the pressure inside the chamber has reached a point where the water is no longer able to boil.
Overall, this experiment demonstrates the relationship between pressure and the boiling point of a liquid. As the pressure decreases, the boiling point of the liquid also decreases, leading to increased vaporization and the formation of bubbles.