Answer:
Correct answers are B and F.
Explanation:
Inside the test tube after a certain time, the pressure inside of the test tube must be equal to the atmospheric pressure, the hydrogen displaces the water inside the tube until the pressure is the same with the atmosphere.
The hydrogen pressure inside the tube must be lower than the atmospheric pressure because otherwise the water inside it would go out until it reaches the atmosphere pressure. The atmospheric pressure is equal to the addition of the hydrogen and water pressures.
The statements that are true are: The total pressure in the test tube is equal to the atmospheric pressure, and The pressure of hydrogen in the test tube is lower than the atmospheric pressure. Option B and F are correct.
When the hydrogen gas is collected over water in an upset-down test tube, as the gas is pushed out at the outlet, it gets pushed toward the atmosphere, and the pressure at the inlet of the tube is said to be the same at the outlet.
This is because, as the hydrogen gas is collected over water, it is not pure although it gets mixed properly with vapor via evaporation of the water.
Thus, the total pressure in the test tube is equal to the atmospheric pressure
By the application of Dalton's law of partial pressure, the desired amount of hydrogen gas can be estimated as:
[tex]\mathbf{P_{atm} = P_{hydrogen } + P_{water \ vapor}}[/tex]
[tex]\mathbf{P_{hydrogen} = P_{atm} - P_{water \ vapor}}[/tex]
Therefore, we can conclude that the pressure of hydrogen in the test tube is lower than the atmospheric pressure.
Learn more about Dalton's Law of Partial Pressure here:
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