The cover plate is removed from the gas jars shown iin the diagram. Nitrogen dioxide is a brown gas. After several days, the color of the gas is the same in both of the jars.
What explains this change?
So the picture shows this jar and nitrogen and nitrogen dioxide is separated equally from a cover plate in between.
They gave the following choices below:
A) Equal volumes of nitrogen and nitrogen dioxide contain equal number of molecules.
B) Nitrogen and nitrogen dioxide gases have equal densities.
C)Nitrogen and nitrogen dioxide molecules are in random motion.
D)Nitrogen and nitrogen dioxide molecules diffuse at the same rate.
The answer is C, could you explain why the ans is C and why the other answers are incorrect, thks!
the molecules in random motion cause diffusion into the air, and the NO2 goes into the air.
other answers:
A) TRUE, BUT HAS NOTING TO DO WITH WHAT IS HAPPENING.
B) NOT TRUE, THEY HAVE SAME NUMBER OF MOLECULES AT SAME TEMP/PRESSURE, BUT EACH MOLECULE (n2 VS NO2) HAS DIFFERENT MASS
d) nOPE, THEY DIFFUSE IN ACCORDANCE WITH gRAHAMS LAW.
Well, I must say, it seems like these gas jars are having quite the colorful party! But let's put on our thinking cap and figure out why the color change happened.
The answer is C) Nitrogen and nitrogen dioxide molecules are in random motion.
You see, when the cover plate is removed, the nitrogen and nitrogen dioxide molecules start to move around randomly. This means that they mix and mingle with each other. Over time, they bump into each other and exchange energy, causing the brown color of nitrogen dioxide to spread evenly throughout the jars.
Now, let's talk about the other choices and why they aren't the right fit for this situation.
A) Equal volumes of nitrogen and nitrogen dioxide contain an equal number of molecules. Well, that might be true, but it doesn't explain why the color changed. The number of molecules alone doesn't affect the color distribution.
B) Nitrogen and nitrogen dioxide gases have equal densities. Density is a measure of how closely packed the molecules are. While it might influence their behavior, it doesn't explain the color change in this case.
D) Nitrogen and nitrogen dioxide molecules diffuse at the same rate. Diffusion refers to the movement of molecules from an area of high concentration to low concentration. Although the rate of diffusion might play a role in the color change, it doesn't explain why the color becomes the same in both jars.
So, in the end, it's the random motion of the molecules (answer C) that leads to the even distribution of the brown color in both jars. It's like a chaotic dance party where everyone ends up mixing together!
The correct answer is C) Nitrogen and nitrogen dioxide molecules are in random motion.
In a closed system, gas molecules are in constant motion due to their kinetic energy. This motion is random, meaning that the molecules move in all directions. As a result of this random motion, the gas molecules will eventually spread out evenly throughout the available space.
In the given scenario, initially, the gas jar with nitrogen dioxide will have a brown color, while the jar with nitrogen will have no color. This is because nitrogen dioxide is a brown gas, while nitrogen is colorless.
However, when the cover plate is removed, the gas molecules can freely move between the jars. Over time, the nitrogen dioxide molecules will spread out, moving from the jar with nitrogen dioxide to the jar with nitrogen, and vice versa. This process of mixing and spreading continues until the gas molecules are evenly distributed in both jars.
The other answer choices are incorrect because:
A) Equal volumes of nitrogen and nitrogen dioxide contain equal numbers of molecules: This is not necessarily true. The number of molecules depends on the mass of the gas sample, not just the volume.
B) Nitrogen and nitrogen dioxide gases have equal densities: The density of a gas depends on its molecular mass and how closely the molecules are packed together. It has no relation to the color change observed in the jars.
D) Nitrogen and nitrogen dioxide molecules diffuse at the same rate: Diffusion is the process by which gas molecules spread out from areas of high concentration to areas of low concentration. While it is true that gases with lower molecular mass generally diffuse faster, the rate of diffusion is not related to the color change observed in the jars.
The correct answer is C) Nitrogen and nitrogen dioxide molecules are in random motion.
Explanation:
When the cover plate is removed from the gas jars, the gases - nitrogen and nitrogen dioxide - are allowed to mix freely. Nitrogen dioxide is a brown gas, while nitrogen is colorless. Initially, the gas jar containing nitrogen dioxide appears brown in color, indicating the presence of the brown gas.
Over time, however, the color of the gas in both jars becomes the same. This change in color indicates that the brown gas, nitrogen dioxide, has dispersed evenly throughout the jar, mixing with the colorless nitrogen gas. This equal distribution of color implies that the gas molecules are mixing in a random manner.
Now, let's analyze why the other options are incorrect:
A) Equal volumes of nitrogen and nitrogen dioxide contain an equal number of molecules: This option suggests that the equal volumes of both gases have the same number of molecules, but it does not explain the change in color. The even distribution of color does not necessarily mean an equal number of molecules.
B) Nitrogen and nitrogen dioxide gases have equal densities: Density refers to the mass of a substance per unit volume. While density may play a role in the behavior of gases, it does not specifically explain the change in color observed in the gas jars.
D) Nitrogen and nitrogen dioxide molecules diffuse at the same rate: Diffusion is the process by which molecules move from an area of high concentration to an area of low concentration until they become evenly distributed. While the equal distribution of gas color suggests diffusion has occurred, this option does not specifically address the change in color observed.
In summary, the change in color observed in the gas jars can be attributed to the random motion of the gas molecules, which causes them to mix and disperse evenly throughout the jar.