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Question

In the virtual lab demo, a student adds particles to a container. While the volume is held constant the initial temperature of the container is 300K.

The pressure fluctuates around what amount?

The student adds heat to the container with the particles. What part of the lab changes?

When the temperature is lowered to half its temperature (150K), the pressure
to about
the original pressure. The new pressure is now about:
.

You can predict, if the temperature was increased 4x the initial temperature, then the pressure would
to
the original pressure.

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Answer 1

To address the questions based on the ideal gas law, which states that:

\[ PV = nRT \]

where P is pressure, V is volume, n is the number of moles of gas, R is the ideal gas constant, and T is temperature in Kelvin.

1. Pressure Fluctuation at 300K: In the virtual lab demo at an initial temperature of 300K, without specific numerical values for pressure, we can't determine an exact amount, but it's typically expected to fluctuate around some standard atmospheric pressure if we think of common lab conditions (e.g., approximately 1 atm or 101.3 kPa).

2. What Part of the Lab Changes When Heat is Added: When heat is added to a container with gas while keeping the volume constant, the temperature of the gas increases. According to the ideal gas law, if volume is constant and the amount of gas doesn't change, the pressure will also increase as temperature increases.

3. New Pressure at 150K: When the temperature is lowered to half its initial temperature (150K), and if we assume that the amount of gas (n) and volume (V) remain constant, the pressure will also drop according to the relationship given by \( P \propto T \). Therefore, the new pressure would be about half the original pressure at 300K.

4. Pressure if Temperature is Increased 4x: If the temperature (T) is increased to 4 times its initial temperature (4 * 300K = 1200K), the pressure would also increase by the same factor (assuming constant volume and number of moles). Thus, the pressure would increase to about 4 times the original pressure.

Here’s a summary fill-in based on these deductions:

• The pressure fluctuates around an initial atmospheric pressure (e.g., approximately 1 atm).
• The part of the lab that changes when heat is added is the temperature of the container.
• When the temperature is lowered to half (150K), the pressure will be about half the original pressure, which would reflect as a decrease in pressure.
• If the temperature increases to 1200K, the pressure would increase to four times the original pressure.

If you wish to proceed with these predictions in the virtual lab, enter those values into the respective fields.